The key that allows a cell to progress beyond the restriction point is the phosphorylation of specific proteins (for example RB) by Cdk. The cyclin-dependent kinases (CDKs) are able to phosphorylate different substrates.
Cyclins regulate the progression of the cell cycle by their interaction with cyclin-dependent kinases (Cdks).
This binding activates the Cdks, thereby converting them into functional enzymes that phosphorylate target proteins and thus regulate cell cycle progression by bypassing restriction points of the cell cycle.
CDKs can phosphorylate different substrates by transferring phosphate groups from adenosine triphosphate (ATP) to specific amino acidic residues in these substrates.
For example, CDKs phosphorylate Rb proteins and thus regulate their activity during the cell cycle.
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which strand or strands shown here would serve as a template for the lagging strand?
Answer:
Bottom strand
Explanation:
which tarsal bone articulates with the tibia and fibula
Answer:
the talus bone
Explanation:
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10. Which of the following statements about the leading strand is true?
A. It is synthesized discontinuously and uses 1 RNA primer.
B. It is synthesized discontinuously and uses multiple RNA primers.
C. It is synthesized continuously and uses multiple RNA primers.
D. It is synthesized continuously and uses 1 RNA primer.
The statement 'the leading strand is synthesized continuously and uses 1 RNA primer' is TRUE. It is replicated in the 3' – 5' direction.
The leading strand refers to the DNA template strand that is synthesized in the 3' – 5' direction during DNA replication.
The 3' – 5' direction that occurs during DNA replication is the direction of the replication fork.
RNA primers are short RNA sequences used for the initiation of the synthesis of DNA (DNA replication) both in the leading DNA strand and the lagging DNA strand.
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An scientist observes a population of cheetahs on the plains in southern Africa and noticed that cheetahs have very little genetic variation. The scientists claims that the cheetahs are susceptible to extinction as a result of climate change. What is the name of the effect the scientist observed and why is it a concern ?(1 point)
Disaster effect, because the cheetahs have mutated to produce ineffective proteins
Frameshift mutation, because it only produces ineffective proteins.
Substitution mutation, because the these mutations cannot be passed to offspring
Bottleneck effect, because it means most cheetahs could succumb to the same environmental stresses
Answer:
Bottleneck effect, because it means most cheetahs could succumb to the same environmental stresses
Bottleneck effect, because it means most cheetahs could succumb to the same environmental stresses.
There is a decline in the population size in because bottleneck effect limit the genetic diversity of the species as only a small part of original population is there.What is bottleneck effect?The bottleneck effect refers to the way in which a reduction and subsequent increase in population's size affects the distribution of genetic variation among its individual.
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Independent assortment of chromosomes is a result of which of the following processes?
a. the diverse combination of alleles that may be found within any given chromosome
b. the random way each pair of homologous chromosomes lines up at the metaphase plate during meiosis I
c. the random combinations of eggs and sperm during fertilization
d. the random distribution of the sister chromatids to the two daughter cells during anaphase II
Answer:
B
Explanation:
Independent assortment of chromosomes refers to the random way each pair of homologous chromosomes lines up at the metaphase plate during meiosis I.
What is independent assortment of chromosomes?The independent assortment of chromosomes is one of the Mendel's laws of genetics.
Independent assortment of chromosomes refers to the random way each pair of homologous chromosomes lines up at the metaphase plate during meiosis I.
Therefore, independent assortment of chromosomes results in traits and characters beings inherited independently from each other.
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Which of the following statements correctly describes genes?
Answer:
Genes are made of DNA and are carried on chromosomes
Explanation:
Chemical to thermal to electrical current?Energy conversion of corn
Answer:
A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit.
Which of the following molecules is broken down in cellular respiration, providing fuel for the cell?.
which receptors respond to stimuli within the body?
Answer:
Sensory receptors respond to stimuli.
Explanation:
They can be classified by their location, the type of stimulus they detect or by their structural complexity.
Sensory receptors are the receptors which respond to stimuli within the
body. The body have five major sensory organs which include the eyes,
nose, tongue, ear and skin.
These organs have receptors which is responsible in the transmission of
signal to the brain for action. The brain acts depending on the signal
received which is usually in the body's best interest.
This makes our sensory organs important and very delicate and as a result
should be adequately protected and taken are of.
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Which sequence of dna bases would pair with this partial strand cat tca ctg?.
What is not an example of DNA?
Answer:
AMOGUS
Explanation:
Anything other than DNA is not an example of DNA
sympathetic nerve fibers are not associated with situations involving __________.
Answer:
Digestion
Explanation:
The parasympathetic division handles things that stimulate digestion.
Which of the following is the observed result of human exposure to a toxin?
I. Increased miscarriages
II. Gender imbalances
III. Increase in incidents of cancer
I, II, and III
II and III
I and III
I only
Answer:
| and |||
Explanation:
Gender Imbalances have nothing to do with exposure to toxin.
Help meeeeeee lzzzzzz
Answer:
Wrong category
Explanation:
Which sentence best explains how a positive feedback loop affects climate
change?
A. As the number of plants increases, the amount of CO2 decreases.
B. High clouds have a high albedo and reflect solar energy back into
space.
C. As climate warms, CO2 increases because plants remove less of
it.
D. High precipitation results in increased plant growth, lowering CO2.
A positive feedback loop that affects climate is change as the number of plants increases, the amount of CO2 decreases.
The more trees the less CO2?Scientists agree that one of the most effective ways to absorb part of the CO2 from the atmosphere would be to plant more trees, as they use CO2 to grow and release oxygen, this action brings benefits to the entire environment.
With this information, we can conclude that A positive feedback loop that affects climate is change as the number of plants increases, the amount of CO2 decreases.
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find the answers for the questions given below
biology-reaching the age of adolsence
Answer:
Hopefully this helps!!
Explanation:
bcaabccbcadbccaDiabetesCortisolMenarcheInfertilityDNAEndocrine28ExocrineThyroidPituitaryThe diagram displays a box of normal DNA. The second box displays mutated DNA. Compare the mutated DNA with the normal DNA and identify the type of mutation that has occurred.
A) Substitution mutation.
B) Chromosomal mutation.
C) Deletion mutation
D) Frameshift mutation.
small substances are passively moved from the blood to the filtrate in:
Answer:
I believe it would filter in the Glomerular filtration.
Explanation:
I dont think you really need one based on the question.
Does “survival of the fittest apply to domesticated animals? Why or why not? *
Answer:
Yes.
Explanation:
This survival of the fittest is instinct helps domestic animals live. Just because an animal is domesticated, does not mean that instincts go away. Those instincts like hunting may get suppressed, but not taking away.
Answer:
Survival of the fittest does not apply to domesticated animals. This is because these animals don't live in the wild so they don't have to run after things and kill them. Their food comes out of a tin and is provided by human beings. They don't have any predators so their lives are seldom at risk. Thus, they don't need to be fitter or more powerful than other animals in any way.
Lets take the example of pet dogs. We keep them for our support or simply because we enjoy their company. We provide them with food, shelter etc. and protect them. Since, we basically do everything for them; they need not evolve into a stronger, more powerful species.
However, in the case of stray dogs, they have to fight for their survival. They have to fight with other dogs for food and shelter. Hence, survival of the fittest will apply here as the strongest dog gets to eat.
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What is ONE way in which geologists may utilize GPS and satellite mapping?
ln humans, red green color blindness is a sex-linked recessive trait. If a man and a woman produce a color blind son, which of the following must be true?
a. The father is color blind.
b. Both parents carry the allele for color blindness.
c. Neither parent carries the allele for color blindness.
d. The father carries the allele for color blindness.
e. The mother carries the allele for color blindness.
If a man and a woman produce a color blind son then both parents carry
the allele for color blindness.
A trait could either be:
DominantRecessiveWhat is a Recessive trait?A recessive trait is usually expressed when there is the presence of two
recessive alleles in an individual or organism. A dominant trait on the other
hand can be expressed with the organism having only one dominant allele
In this scenario, the red green color is a recessive trait
and the offspring produced is color blind which basically means that both
parents carry the allele for color blindness.
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Mrs. W. is 68 years old and lives alone. She moves very slowly and does not respond verbally to what others say. She sometimes mumbles to herself. Her face is expressionless. She seems confused by her surroundings. She is accompanied by her daughter, who is highly observant and an accurate reporter of Mrs. W.’s past medical and psychosocial history. What possible Noncognitive Disorders could Mrs. W have?
The non-cognitive disturbances that Mrs. W. could have related to some dementia are psychosis, personality change, lack of rhythm, deficit in emotional responses, mental confusion.
It is important that the patient in these conditions is continuously assisted, to avoid situations that put her safety at risk.
An elderly woman like Mrs. W, who already has significant evolution of non-cognitive disorders, must have an effective medical apparatus and a tutor willing to help with care and daily activities.
Ideally, caregivers should develop optimal communication skills for patients with these disorders, such as a calm and gentle tone, provide the individual with a peaceful environment without too much noise or other disturbances, as well as being considerate and not neglecting the individual's needs.
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____________ results from chemicals in car exhaust reacting with the sunlight.
Acid Rain
Contaminant fog
Smog
Greenhouse Effect
Answer:
smog
Explanation:
Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities.
What caused the foam in this experiment?
Answer:
the yeast
Explanation:
Determine the phenotypic ratios of the offspring. 9 yellow-inflated : 3 yellow-constricted : 3 green-inflated: 1 green-constricted 9 green-inflated : 3 green-constricted : 3 yellow-inflated : 1 yellow-constricted 9 green-constricted : 3 green-inflated : 3 yellow-constricted : 1 yellow-inflated 9 yellow-constricted : 3 yellow-inflated : 3 green-constricted : 1 green-inflated
From a cross between dihybrid individuals, whose diallelic genes code for one trait each, expressing complete dominance, the phenotypic ratio is B) 9 green-inflated : 3 green-constricted : 3 yellow-inflated :1 yellow-constricted.
-------------------------------
Since I do not have the cross, I will assume the cross involves two dihybrid individuals by looking at the options.
So, let us picture the situation,
Two diallelic genes code for one trait each, color and inflated/constricted pods.G allele is the dominant and codes for green podsg allele is recessive and codes for yellow podsI is the dominant allele and codes for inflated podsi is recessive and codes for constricted podsThese genes are not linked1st Cross) Two h0m0zyg0us individuals
Parental) GGII x ggii
F1) 100% GgIi
2nd Cross) Selfcross between F1 individuals
Parentals) GgIi x GgIi
Gametes) GI, Gi, gI, gi
GI, Gi, gI, gi
Punnett square) GI Gi gI gi
GI GGII GGIi GgII GgIi
Gi GGIi GGii GgIi Ggii
gI GgII GgIi ggII ggIi
gi GgIi Ggii ggIi ggii
F2) Genotype
1/16 GGII2/16 GGIi1/16 GGii2/16 GgII4/16 GgIi2/16 Ggii1/16 ggII2/16 ggIi1/16 ggii
Phenotype
9/16 G-I- ⇒ Green and Inflated3/16 G-ii ⇒ Green and constricted3/16 ggI- ⇒ Yellow and inflated1/16 ggii ⇒ Yellow and constrictedPhenotypic ratio 9:3:3:1
Options
A) 9 yellow-inflated : 3 yellow-constricted : 3 green-inflated: 1 green-constricted ⇒ NOT CORRECT
B) 9 green-inflated : 3 green-constricted : 3 yellow-inflated : 1 yellow-constricted ⇒ CORRECT
C) 9 green-constricted : 3 green-inflated : 3 yellow-constricted : 1 yellow-inflated ⇒ NOT CORRECT
D) 9 yellow-constricted : 3 yellow-inflated : 3 green-constricted : 1 green-inflated ⇒ NOT CORRECT
-----------------------------
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A network of interwoven anterior rami of spinal nerves is a:
Research and produce a summary about the history of the microscope.
Biology cell division
What are the answers to this chart
The cell spends most of the time in the interphase, which is in the G1, S, and G2 phases, and approximately 22 hours out of 24 hours, with the rest being 1–2 hours, are spent in the division phase.
What is the time spent in the cell cycle?
The cell enters the cell cycle, and the first stage is the G1 phase, where the cell grows and spends a lot of time nearly 11 hours and then the cell enters the S phase. In the S phase, the DNA replicates and spends nearly 7 hours, and then in the G2 phase, 3 to 4 hours are spent by the cell, with the remaining 1 to 2 hours spent in the M phase, also called the mitosis or division phase.
Hence, cells spend most of the time in the interphase, which is in the G1, S, and G2 phases, and approximately 22 hours out of 24 hours, with the rest being 1–2 hours, are spent in the division phase.
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any one interested in revising Biology nutrition in animals?
Answer:
yes...let's do it am interested
Answer:
yeah I am interested in revision
Which of the following choices best describes ‘ovulation?'
A. An egg is released from the ovary.
B. An embryo sinks into the uterus lining.
C. The sperm and egg nuclei fuse.
D. The ejection of sperm through the penis.
Answer:
An egg is released from the ovary
Ovulation is a crucial process in the female reproductive system, occurring as a part of the menstrual cycle. It involves the release of a mature egg (ovum) from one of the ovaries. The correct option is A. An egg is released from the ovary.
1. **Menstrual Cycle**: The menstrual cycle is the regular hormonal cycle that occurs in women of reproductive age. It typically lasts around 28 days, although the length can vary from woman to woman. The cycle is divided into different phases, with ovulation occurring during one specific phase.
2. **Follicular Phase**: The menstrual cycle begins with the follicular phase, where hormones, primarily follicle-stimulating hormone (FSH) and luteinizing hormone (LH), are released by the pituitary gland. These hormones stimulate the growth and maturation of follicles in the ovaries.
3. **Ovarian Follicles**: Within the ovaries, multiple tiny sacs called ovarian follicles contain immature eggs. Each month, one of these follicles becomes dominant and continues to grow while others degenerate.
4. **Mature Follicle Development**: As the dominant follicle grows, it secretes estrogen, a hormone that prepares the uterus for a potential pregnancy. The rising estrogen levels also trigger a surge in luteinizing hormone (LH) around the middle of the menstrual cycle.
5. **Ovulation**: The LH surge triggers the final stage of ovulation. It causes the mature follicle to rupture and release the mature egg from the ovary. The egg is swept into the fallopian tube by tiny hair-like structures called cilia.
6. **Fertilization**: The released egg remains viable for about 12-24 hours. If sexual intercourse occurs during this time and sperm are present in the fallopian tube, fertilization may occur. Fertilization is the process where the sperm penetrates the egg, resulting in the formation of a zygote (fertilized egg).
7. **Implantation or Menstruation**: If the egg is not fertilized, it will eventually disintegrate, and hormone levels will drop. This leads to the shedding of the uterine lining, causing menstruation to occur. On the other hand, if fertilization occurs, the resulting zygote will undergo several divisions and travel down the fallopian tube to the uterus, where it may implant into the uterine lining and develop into a pregnancy.
Ovulation is a crucial event in the female reproductive cycle, marking the release of a potential egg for fertilization. It is a key factor in determining fertility and the ability to conceive a child.
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