Erwin Char-gaff determined that the number of purines, like guanine and adenine, always equal the number of pyrimidines, like cytosine and thymine, in DNA. This is known as Char-gaff's rule,
What is Char-gaff's rule?Char-gaff's rule is a fundamental principle of DNA base pairing that states that in a DNA molecule, the amount of guanine (G) is equal to the amount of cytosine (C), and the amount of adenine (A) is equal to the amount of thymine (T). Specifically, Char-gaff found that the base composition of DNA varies between species, but within a given species, the percentage of A always equals the percentage of T, and the percentage of G always equals the percentage of C.
Char-gaff's rule is important because it provided crucial information for the development of the double helix model of DNA proposed by James Watson and Francis Crick. It helped explain how DNA molecules are able to maintain their structure and replicate accurately during cell division. The rule suggests that the complementary base pairing of A-T and G-C is the key to the stability of the DNA double helix, as A can only form hydrogen bonds with T, and G can only form hydrogen bonds with C. Therefore, the amount of A must equal the amount of T, and the amount of G must equal the amount of C, for the two strands of the DNA molecule to come together and form a stable helix.
To know more about Char-gaff's rule, visit:
https://brainly.com/question/20804844
#SPJ1
What is the function of the external auditory meatus in the ear?
The main function of the external auditory meatus (ear canal) is to channel sound waves from the environment to the eardrum. The ear canal is a tube-like structure that runs from the outer ear to the eardrum.
It has a thin layer of skin lining, tiny hairs, and glands that secrete wax. Sound is amplified and directed towards the eardrum thanks to the structure of the ear canal.
The fragile inner ear components are shielded from dust, dirt, and other foreign objects by the ear canal.
The ear canal aids in preventing infection and harm to the eardrum and other inner ear structures by collecting debris. Earwax is also produced in the ear canal and protects the eardrum and ear canal by lubricating them.
Moreover, the earwax aids in the capture of foreign objects to keep them out of the inner ear.
To learn more about eardrum visit:
https://brainly.com/question/12770491
#SPJ4
Which of the following is NOT likely to be true of primitive microbes?
a) They were aerobic
b) They were photosynthetic
c) They could survive in acidic conditions
d) They had a plasma membrane
They were aerobic. The body plan and structure of a primitive organism are far more basic. When these organisms evolved, their bodies remained essentially unchanged.
Amoebas are an illustration of a typical primordial organism. Conversely, complex body plans and sophisticated structural organization are characteristics of advanced creatures. The hominin species is an illustration of a sophisticated organism.
The term "primitive organism" refers to earlier-formed creatures with a straightforward (basic) body structure. Primitive organisms were the first life forms to emerge on Earth. They are the lowest class of life. Simple body structures characterize these species. Prokaryotes are the earliest form of primitive life.
A single cell in prokaryotes performs all the necessary tasks. These creatures are devoid of additional cell organelles, including a membrane-bound nucleus.
Learn more about aerobic here:
https://brainly.com/question/8008968
#SPJ4
Scientists use a standardized taxonomic system to separate organisms into hierarchical groups based on similarities and differences in their structural and genetic characteristics. Which of the following best explains why a standardized classification system is important to the scientific community?
The correct answer is It allows different kinds of organisms to be easily identified based on their characteristics.
A standardized taxonomic system gives a typical premise to the whole academic local area to distinguish and characterize organic entities on shared convictions and subsequently prompt a normalized organic entity characterization across the globe.
This additionally bunches organic entities into various realms, taxes, and classes with characterized ordered progression and portrayal of shared attributes and qualities. It additionally gives extension to the incorporation of newfound species in this manner making the normalized ordered framework adaptable.
Researchers utilize a two-name framework called a Binomial Naming Framework. Researchers name creatures and plants utilizing the framework that portrays the variety and types of the organic entity. The principal word is the variety and the second is the species. The principal word is promoted and the second isn't.
To learn more about organisms here
https://brainly.com/question/17164427
#SPJ4
Q- Scientists use a standardized taxonomic system to separate organisms into hierarchical groups based on similarities and differences in their structural and genetic characteristics.
Which of the following best explains why a standardized classification system is important to the scientific community?
It allows different kinds of organisms to be easily identified based on their characteristics.
nitrogen is the easist soil nutrient to test for?
False. An "extractant" solution is blended (often by shaking) with the soil sample. After mixing, the liquid part of the sample is filtered and its nutrient content is examined.
Depending on the nutrients being assessed as well as the unique lab setup and design, different analytical equipment will be used. All of the necessary plant nutrients are present in soil organic matter because it is mostly made up of plant leftovers. As a result, accumulating organic matter serves as a plant food source. In a form that plants can use, the stable organic component (humus) adsorbs and retains nutrients. Plant growth requires good soil nutrients. Due to their high demand, the macronutrients (nitrogen, potassium, and phosphorus) are regulated and replaced as fertiliser on a crop-by-crop basis.
To know more about extractant, click here:
https://brainly.com/question/16848369
#SPJ4
T or F. nitrogen is the easist soil nutrient to test for?
listed are the general terms for the different segments of the lymphatic pathways of the body. place them in the correct order, starting closest to the tissues at the top of the list and ending at the veins in the thorax.
The right order of lymphatic capillaries, lymphatic vessels, lymphatic trunks, and lymphatic ducts is from tissues to veins in the thorax.
What is the proper sequence for lymph fluid to move through the body?Many afferent lymphatic vessels carry lymph into a lymph node. Then, after passing through the node's cortex, paracortex, and medulla, it leaves the other side through a single efferent lymphatic channel.
Which is the ideal route for lymph fluid to follow as it travels from the tissues to the heart?The lymphatic veins empty into two subclavian veins, which are found beneath the collarbones, through collecting ducts. Together, these veins make up the superior vena cava.
To know more about lymphatic capillaries visit :-
https://brainly.com/question/29651472
#SPJ4
What is an external occipital protuberance?
The external occipital protuberance is a bony protrusion or bump located on the back of the skull, near the base of the skull where it meets the neck. It is also known as the external occipital protuberance or inion.
The external occipital protuberance is a point of attachment for various muscles and ligaments that are involved in neck and head movements. It is more prominent in some individuals than others and can vary in size and shape.
In addition to its biomechanical function, the external occipital protuberance can also be used as a landmark for medical imaging and surgery, as it can be easily palpated and identified on the surface of the skin.
To know more about external occipital protuberance click here:
https://brainly.com/question/29773157
#SPJ4
All of the following should be done when centrifuging specimens, EXCEPT?
a) Specimens without anticoagulant should sit for 30 minutes before centrifugation.
b) Specimens with anticoagulant should sit for 20 minutes before centrifugation.
c) Cap all tubes for centrifugation.
d) Allow the centrifuge to come to a complete stop by itself before opening it.
The correct option is B ; Specimens with anticoagulant should sit for 20 minutes before centrifugation.
Put the collection tube upright in the rack and leave it there for 30 to 60 minutes to allow the blood to clot at room temperature. The minimum clotting time for people with a healthy clotting process is 30 minutes. Place the tube in the centrifuge with the stopper end up after allowing the clot to develop.
When the test calls for a sample of serum or plasma, it is crucial to separate the cellular and liquid components of a blood specimen as quickly as feasible. This is because the cells' interactions with the serum or plasma change its chemical makeup and skew the results of the test. Tube for a serum separator (SST): For use in numerous laboratory investigations, this tube comprises a serum gel separator and clot activator. To start the clotting, invert the tube.
Learn more about centrifuging specimens
https://brainly.com/question/29357684
#SPJ4
what kind of evidence supports the classification of all organisms into the three-domain system?
The classification of all living organisms into the three-domain system (Bacteria, Archaea, and Eukarya) is supported by a range of different types of evidence.
Comparative biochemistry: The three domains of life have fundamental biochemical differences that reflect their evolutionary history. For example, the enzymes and metabolic pathways of Archaea are more similar to those of Eukarya than to those of Bacteria, suggesting that Archaea are more closely related to Eukarya than to Bacteria.
Comparative genomics: Analysis of DNA and RNA sequences from different organisms has revealed a great deal about their evolutionary relationships. Comparisons of complete genomes have provided strong evidence that Bacteria, Archaea, and Eukarya are distinct domains of life.
Comparative morphology: Observations of the structure and form of cells and tissues of different organisms can provide evidence of evolutionary relationships. However, morphology alone is not sufficient to classify organisms into domains.
Biogeography: The distribution of organisms across the globe can provide evidence of their evolutionary history. For example, the distribution of certain groups of Archaea in extreme environments, such as hot springs or deep-sea hydrothermal vents, supports the hypothesis that these organisms represent ancient lineages of life.
Phylogenetic analysis: The study of the evolutionary relationships among organisms using molecular and genetic data has become a powerful tool for classification. By comparing DNA and RNA sequences, researchers can construct phylogenetic trees that show the evolutionary relationships among different organisms.
To know more about evidence here
https://brainly.com/question/12011520
#SPJ4
What observation can be made on a petri dish determine that the chosen bacteria has been infected by a virus that replicates using the lytic cycle?
Formation of plaques Bacterial cells may exhibit new properties Difference in color of the bacteria Overgrowth of bacteria
When a virus enters a bacterial cell, it replicates utilizing the lysogenic and spreads throughout the bacterium. On Petri plates containing nutritional medium, it creates the plaque, which is a distinct circular zone.
What are bacterial cells, and what do they do?Water, catalysts, vitamins, waste products, and gases make up its gel-like matrix, which also houses ribosomes, chromosomes, and plasmids, among other cell components.
What kinds of cells make up a bacterial cell?In that they have nucleus, ribosomes, as well as a plasma membrane, bacteria resemble eukaryotic cells. A bacterial cell may be distinguished from a eukaryotic cell by its circular nucleoid DNA, absence of membrane-bound organelles, peptidoglycan cell wall, and flagella.
To know more about bacterial cells visit:
https://brainly.com/question/2145627
#SPJ1
which bodily system does not exchange material with its environment
The only physiological system that does not exchange information with its surroundings is the nervous system.
The brain, spinal cord, and nerves make up the nervous system, which has as its primary duty the control and coordination of bodily processes and responses to both internal and external stimuli. The nervous system does not interchange substances with the environment, such as gases, nutrients, and waste products, like other physiological systems do. Instead, it uses sensory receptors to take in information from the environment, process it, and then transmit signals to the rest of the body to start the proper reactions. To maintain homeostasis and keep the body operating normally, the human body has a number of systems that cooperate. The following are some of the major bodily systems: The circulatory system is in charge of for moving waste materials, nutrients, and oxygen throughout the body. It consists of the blood, blood vessels, and the heart. The respiratory system is in charge of inhaling oxygen and exhaling carbon dioxide. It includes the bronchial tubes, trachea, and lungs. The digestive system is in charge of nutrient absorption and food breakdown. The mouth, oesophagus, stomach, small and large intestines, the rectum, and the anus are all included. The nervous system is in charge of directing and coordinating how the body responds to both internal and exterior stimuli. It consists of the nerves, spinal cord, and brain. The endocrine system is in charge of manufacturing and secreting hormones that control a number of body processes. It consists of the gonads, pancreas, thyroid, adrenal, and pituitary glands.
Learn more about nervous system here:
https://brainly.com/question/29355295
#SPJ4
The only physiological system that does not exchange information with its surroundings is the nervous system.
The brain, spinal cord, and nerves make up the nervous system, which has as its primary duty the control and coordination of bodily processes and responses to both internal and external stimuli. The nervous system does not interchange substances with the environment, such as gases, nutrients, and waste products, like other physiological systems do. Instead, it uses sensory receptors to take in information from the environment, process it, and then transmit signals to the rest of the body to start the proper reactions. To maintain homeostasis and keep the body operating normally, the human body has a number of systems that cooperate. The following are some of the major bodily systems: The circulatory system is in charge of for moving waste materials, nutrients, and oxygen throughout the body. It consists of the blood, blood vessels, and the heart. The respiratory system is in charge of inhaling oxygen and exhaling carbon dioxide. It includes the bronchial tubes, trachea, and lungs. The digestive system is in charge of nutrient absorption and food breakdown. The mouth, oesophagus, stomach, small and large intestines, the rectum, and the anus are all included. The nervous system is in charge of directing and coordinating how the body responds to both internal and exterior stimuli. It consists of the nerves, spinal cord, and brain. The endocrine system is in charge of manufacturing and secreting hormones that control a number of body processes. It consists of the gonads, pancreas, thyroid, adrenal, and pituitary glands.
Learn more about nervous system here:
https://brainly.com/question/29355295
#SPJ4
Fill The Blank? to use a spectroscope, position the tool to allow light to enter through the _________
To use a spectroscope, position the tool to allow light to enter through the slit. The light will reflect off the diffraction grating.
What is a spectroscope?A spectroscope may be defined as a type of laboratory instrument or device that significantly measures the spectrum of light. It dissociates the light from a single material into its component colors like the way through which a prism splits white light into different seven colors.
According to the context of this question, a spectroscope generally works on the principle through which a slit allows the white light to pass through. Once the light passes through, a diffraction grating splits the white light into different seven colors of the rainbow.
Therefore, to use a spectroscope, position the tool to allow light to enter through the slit. The light will reflect off the diffraction grating.
To learn more about Spectroscope, refer to the link:
https://brainly.com/question/14854785
#SPJ1
select the findings of Erwin Chargaff regarding DNA composition
According to Erwin Chargaff's rule, we come to know that A=T, G=C. So, options A and B are correct.
Biochemist Erwin Chargaff made significant advances to our knowledge of DNA's structure. He found that the amounts of adenine (A) and guanine (G) are equivalent to the amounts of thymine (T) and cytosine, respectively (C) in a complementary base pairing that forms the double helix structure of DNA.
When Watson and Crick proposed the idea of DNA as a double helix, Chargaff's finding of complementary base-pairing in DNA was a vital piece of supporting evidence. It offered important new insights into the structure of the DNA molecule.
To know more about Erwin Chargaff's rule
brainly.com/question/30663996
#SPJ4
The complete question is:
Select the findings of Erwin Chargaff regarding DNA composition. (Select all that apply)
A) A=T
B) G=C
C) A=C
D) G=T
what determines the health of the aquatic ecosystem
Health of the aquatic ecosystem is determined by many factors like Water quality, Habitat quality ,Biodiversity and human impact.
Most important factor for health of ecosystem is quality of water, that includes temperature, pH, pollutant and nutrient levels .Because high levels of pollutants and pH can lead to death of aquatic organisms. Also, availability of appropriate habitat, that includes vegetation, rocks can helps aquatic organisms to find shelter and food.
Also , number and variety of species that thrives in the aquatic ecosystem is also important. A diverse ecosystem is generally considered as healthy. Human activities is one of the most important player in the health of aquatic life these includes pollution, overfishing, and habitat destruction by encroachment.
To learn more about ecosystem , here
brainly.com/question/1061425
#SPJ4
what is muscles of mastication?
Masticatory muscles are those that attach to the mandible and so create movements of the lower jaw.
The masticatory muscles are a set of muscles that are responsible for the chewing movement of the jaw at the temporomandibular (TMJ) joint, they improve the eating process, they help with food crushing, and they also function to approximation the teeth .
The four primary masticatory muscles arise from the surface of the skull and connect to the rami of the mandible at the TMJ. These muscles move in the following ways: elevation, depression, protrusion, retraction, and side to side movement. Three of the primary muscles are in charge of mandibular adduction, while one is in charge of mandibular abduction.
Learn more about muscles of mastication
https://brainly.com/question/12444635
#SPJ4
which lobe of your brain are you using when you answer this question?
Precentral gyrus of the frontal lobe is used when I am answering this question.
Primary motor cortex is located within the precentral gyrus. They are generally responsible for the control of voluntary movement that are motor in nature. As the precentral gyrus is the location of the primary motor cortex, several motor pathways originate within it. The dysfunction of the precentral gyrus plays a role in the when the voluntary movements are impaired and they are associated with schizophrenia and it has significantly reduced functional activity in patients with schizophrenia. The functional organization of the precentral gyrus is such that clusters of Betz cells are morphologically represented by an inverted homunculus.
For more information on precentral gyrus,visit:
https://brainly.com/question/29823235
#SPJ4
in the absence of oxygen, cells capable of fermentation
In the absence of oxygen, cells capable of fermentation oxidize NADH to produce NAD+.
What does the expression 'oxidize NADH to produce NAD+' mean?The expression 'oxidize NADH to produce NAD+' means metabolic pathways involving oxide reduction reactions required to produce ATP, which is the energy coin of the cell and can be produced both in aerobic conditions and anaerobic conditions such as in this case.
Therefore, with this data, we can see that the oxidization of NADH to produce NAD+ is required to generate ATP which is in turn used to carry out metabolic functions.
Learn more about the oxidization of NADH here:
https://brainly.com/question/18760517
#SPJ1
What kind of mutation is present in the strain's ura3 gene? MATa ura3-delta2 leu2 his3::URA3
Answer:
Explanation:
What is the function of URA3?
URA3 encodes orotidine 5-phosphate decarboxylase (ODCase), an enzyme involved in the de novo synthesis of pyrimidine ribonucleotides (shown here; 2). ODCase, which is responsible for catalyzing the decarboxylation of orotidine 5-phosphate (OMP) to uridylic acid (UMP), is one of the most proficient enzymes in nature.
What part of the flower is the female gametophyte?
Answer:
ovary
Explanation:
is where fertilisation takes place
Which does not cause rapid growth in a population?
A. elimination of a pollutant
B. elimination of predators
C. increase in food supply
D. introduction of a new parasite
E. introduction into a new habitat
Answer:
B. elimination of predators does not cause rapid growth in a population.
Explanation:
B. elimination of predators does not cause rapid growth in a population. In fact, the elimination of predators often leads to a decrease in the population size of the prey species, as without the predation pressure, the prey population may exceed the carrying capacity of the environment, leading to increased competition for limited resources and other factors that can limit population growth.
A, C, D, and E can all cause rapid growth in a population, although the specific effects may depend on the species and the particular circumstances. For example, the elimination of a pollutant can improve the health and survival of individuals in a population, leading to increased reproduction and population growth. Similarly, an increase in food supply can lead to increased reproduction and survival, while the introduction of a new parasite can reduce the population size of the host species, potentially leading to an increase in the survival and reproduction of the remaining individuals. Finally, the introduction of a population into a new habitat can often lead to rapid population growth as the population expands into an area with more resources and fewer limiting factors.
which cause of abnormality is often a focus of biological approaches?
The physical problems that underlying the mental disease are the focus of the biological approach to abnormal psychology.
These problems could include physical disease, brain injury or lesions, or chemical imbalances. Drugs are typically used in biological treatments, which means that most biological treatments are pharmacological.
The biological model of abnormality, which is the only one not based on psychological principles, is predicated on the idea that since the brain, neuroanatomy, and associated biochemicals are all physical objects that interact to mediate psychological processes, any treatment for mental abnormalities must be physical or biological.
Neurotransmitters and hormones are two additional biological components, in addition to genes, that effectively contribute to an individual's deviant behaviour. Abnormal neural plasticity or brain dysfunction are brought on by neurotransmitter imbalances, such as those involving GABA, norepinephrine, etc.
Learn more about abnormal psychology. https://brainly.com/question/17615326
#SPJ4
The nereus is simply an unmanned deep-sea remote operated vehicle (rov). please select the best answer from the choices provided
true
false
False. The statement that the Nereus is simply an unmanned deep-sea remote-operated vehicle (ROV) is not entirely accurate.
The Nereus is a type of unmanned deep-sea vehicle, but it is not just any ROV. It is actually a hybrid remotely-operated vehicle (HROV), which means it is capable of both autonomous and tethered operations. This means that the Nereus can be programmed to operate on its own, without the need for human intervention, but it can also be controlled remotely by operators on a ship or on shore.
The Nereus is also equipped with a unique design that allows it to explore the deepest parts of the ocean. It is built to withstand the immense pressure found in the deep sea, and it is equipped with a series of high-tech sensors and cameras that allow it to capture images and collect data in real-time.
Overall, the Nereus is an advanced deep-sea vehicle that is capable of a wide range of scientific and exploratory missions. While it can be classified as an ROV, it is more accurately described as a hybrid remotely-operated vehicle due to its unique capabilities and design.
Learn more about Nereus here:
https://brainly.com/question/3092625
#SPJ4
which of these is a repository for detailed information on virus outbreaks?
There is a sizable collection of security-related literature on the SANS Institute website on virus outbreaks.
A Computer Emergency Response Team Coordination Center (CERT/CC), the first incident response team for computer security incidents, was established at Carnegie Mellon University in Pittsburgh, Pennsylvania, in late 1988.
Data that needs to be shielded from unwanted access in order to protect the security or privacy of a person or organisation is considered sensitive information.There is a sizable collection of security-related literature on the SANS Institute website on virus outbreaks. Software that lies inactive until a certain condition is met is known as a logic bomb. Usually, that requirement is a time and date. When the need is satisfied, the software performs some harmful deed, such deleting files, changing the configuration of the machine, or even unleashing a virus. Many computers are linked via a hub in a local network (LAN).
Learn more about virus
https://brainly.com/question/1427968
#SPJ4
________ a superior projection on the ________ bone, attaches to the dura mater and secures the brain within the skull.
Crista Galli a superior projection on the Ethmoid bone attaches to the dura mater and secures the brain within the skull.
The ethmoid bone, which is found near the base of the skull, protrudes superiorly and forms the crista galli. The falx cerebri, a piece of dura mater that divides the two hemispheres of the brain, attaches to the triangular ridge at this location. This attachment offers the brain additional support and works to limit excessive movement that can harm sensitive brain areas.
One of the bones that make up the skull is the ethmoid bone, which is crucial in supporting and safeguarding the brain. It is part of the nasal cavity and the eye sockets, and it is situated at the base of the skull. There are various projections on the ethmoid bone, but the crista galli is particularly significant because it holds the brain securely inside the skull.
Learn more about Ethmoid bone
brainly.com/question/7186775
#SPJ4
food bolus complicating acute alcohol intoxication is called___
The food bolus complication that can occur during acute alcohol intoxication is called "alcohol-induced regurgitated food bolus (ARFB)."
ARFB is a medical emergency that can occur when an alcoholic person vomits and aspirates a large food bolus. The food bolus can become lodged in the airway, causing respiratory distress and possibly leading to aspiration pneumonia, a serious lung infection.
Individuals who have consumed large amounts of alcohol, have a history of alcohol abuse, or have a history of gastrointestinal disorders that affect swallowing or gastric emptying are at a higher risk of ARFB.
ARFB must be identified and treated as soon as possible to avoid serious complications and death. Treatment usually consists of removing the food bolus from the airway, administering oxygen, and providing supportive care to manage respiratory distress and prevent infection.
For more question on pneumonia click on
https://brainly.com/question/1570932
#SPJ4
What type of nitrogenous base is thymine?
Answer:
Thymine is a type of pyrimidine nitrogenous base.
Fat soluble compounds that are stored in the fat tissues of organisms, at ever increasing concentration as it moves up the food chain are serious threat because of________________________________________________________
Biomagnification is the process by which the concentration of certain fat-soluble compounds (such as persistent organic pollutants or heavy metals) increases as they move up the food chain.
What is Saturated Fat?
It is called "saturated" because its carbon atoms are "saturated" with hydrogen atoms, meaning that each carbon atom in the fat molecule is connected to the maximum number of hydrogen atoms possible. This gives saturated fats a characteristic solid texture and high melting point.
Saturated fats are commonly found in animal products, such as meat, butter, cheese, and cream, as well as some plant-based oils, such as coconut oil and palm oil. They are also found in many processed foods, such as baked goods, fried foods, and snack foods.
This occurs because predators at higher trophic levels consume many prey items that contain these compounds, leading to their accumulation in the predator's tissues.
As a result, the higher up an organism is in the food chain, the greater the concentration of these compounds in its tissues. This can be a serious threat because these compounds can have harmful effects on the health of organisms at high concentrations. For example, they can disrupt hormones, damage the nervous system, and impair reproductive function. Additionally, humans can be exposed to these compounds by consuming contaminated fish and other animals, leading to potential health risks.
Learn more about Saturated fat from given link
https://brainly.com/question/24186437
#SPJ1
What happens after old blood, which has already circulated through the body, moves into the heart?
answer choicesa. it goes to kidneys, where it is removed
b. it is recirculated through the body
c. it goes to lungs for more oxygen
d. it is removed through the digestive system
What are the 2 bones in the leg?
The tibia and fibula are the two long bones in the lower leg. They connect the knee and ankle, but they are separate bones.
The bigger of the two lower leg bones, the tibia is sometimes known as the shinbone. The knee joint is located on top of the tibia, while the ankle joint is located at the bottom. It still needs the fibula's support even though this bone bears the bulk of the body's weight.
The tibia travels alongside the fibula, sometimes known as the calf bone, which is smaller than the tibia. Although it is situated below the knee joint, the top of the fibula is not actually a member of the joint. The exterior of the ankle joint is made up of the lower end of the fibula. Although it doesn't have much weight, the fibula aids in the tibia's stabilization.
To know more about tibia click here:
https://brainly.com/question/10275092
#SPJ4
what is the function of the lac repressor system in e. coli
The function of Lac repressor system in E. Coli is inhibition of transcription process of the Lac operon.
Lac operon is a gene involved in metabolism processes which functions only in presence of lactose and absence of glucose. It has one regulatory gene and three structural genes. Repressor proteins are coded by regulatory genes. The role of LacI is to inhibit mRNA production for proteins encoded by the lac operon. E. coli is a bacteria, in which there is one repressor gene and one promoter gene.
The Lac repressor gene binds with DNA specifically at the site of operation and blocks the RNA polymerase to move down the DNA strand. However presence of lactose changes this process and the repressor gene is unable to bind with the DNA strand and so RNA polymerase takes place part in transcribing the structural gene.
Learn more about Lac repressor gene at:
brainly.com/question/17256430
#SPJ4
What organelle releases neurotransmitters into the synaptic cleft what stimulates this organelle to do this?
The primary organelle for neurotransmitter release is the synaptic vesicle, which is a uniform organelle with a diameter of about 40 nm. There are hundreds of synaptic vesicles packed with neurotransmitters at each presynaptic nerve terminal.
The synaptic cleft, which is a 20–40 nm gap between the presynaptic axon terminal and the postsynaptic dendrite, is where neurotransmitter is released from the neuron when an action potential reaches the presynaptic terminal (often a spine).
An rise in Ca2+ concentration causes some synaptic vesicles to fuse with the presynaptic plasma membrane, releasing neurotransmitters into the synaptic cleft, the area between the pre- and postsynapse where they can bind to receptors on the postsynaptic plasma membrane.
Learn more about neurotransmitters synaptic Visit: brainly.com/question/26387085
#SPJ4
