Write the reason why starch test shows blue-black color.​

Answers

Answer 1

Answer: Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine.

Explanation :The iodine molecule slips inside of the amylose coil.n This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black color.


Related Questions

Science is based on "natural" causes and effects. What does "natural"
mean in this context?
O Phenomena that can be reliably observed with senses or instruments; NOT
supernatural.
O Phenomena that occur on their own without being manipulated; NOT
controlled.
O Phenomena that occur without the direct participation of humans; NOT
artificial.

Answers

Answer:

○Phenomena that occur on their own without being manipulated;Not controlled.

Explanation:

the word natural means which already existed in nature and not controlled by anyone or a thing, where the Phenomena that occur on their own without being manipulated; Not controlled.

help pls i will mark brainiest​

Answers

Answer:

Water, Sunlight, and Oxygen = Abiotic While Consumers and Producers are Biotic

Explanation:

Because biotic is LIving and Abiotic is Non-Living.

Tell me If this helps!

Farmers prefer to plant crops in soil that is rich in nutrients. Which of these soil types would MOST LIKELY contain the most nutrients?

soil that has many large rock particles in it

soil that allows water to drain very easily through it

soil with a bedrock that is very close to the surface

soil with a lot of decomposed organic material in it

Answers

Answer:

Soil with a lot of decomposed organic material in it.

Explanation:

I need help with question 1 please

Answers

Answer:

to blurry sorry

Explanation:

Which continent reports the greatest number of edible species? ____________________________

Answers

Answer:

it is africa:)hope it helps you

Since the initial emergence of human immunodeficiency virus (HIV), this disease has spread across the world. This type of spread is known as a

Answers

Given what we know, we can confirm that the spread of disease in the way that was observed with the initial emergence of the human immunodeficiency virus (HIV), can be referred to as a pandemic.

What is a pandemic?

This is a word we use to describe the seemingly or initially uncontrollable spread of an infectious disease across a very large region. The case of HIV was practically global and required great efforts to bring it under control.

Therefore, we can confirm that the spread of disease in the way that was observed with the initial emergence of the human immunodeficiency virus (HIV), can be referred to as a pandemic.

To learn more about disease visit:

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The becomes the seed, while the ovary becomes the fruit,
after fertilization.

Answers

Explanation:

the ovary becomes the seed, while the ovary becomes the fruit,

after fertilization.

What combines in different
ways to make up all matter?
1.

Answers

Answer:

Atoms

Explanation:

Atoms are the basic building block of all matter

What are all over the body, make up the nervous system, and send messages to the brain?
A. nerve cells

B. axons

C. dendrites

D. hormones

Answers

The answer is A. Nerve Cells. Nerves send messages to the brain and are all over your body

PLEASE HELP ASAP THIS IS OVERDUE BIOLOGY HOMEWORK
First, ____ unzips the strands. Next,
___ __________ reads the strands and fills
in the missing bases on both sides.
The ________ strand is completed
continuously, while the _______ strand is
completed in sections.
When this process is completed, 2 identical DNA strands are produced.
Each with an _____ side and a
________ side.

Answers

Answer:

First, DNA helicase unzips the strands. Next, the DNA polymerase reads the strands and fills in the missing bases on both sides.The lagging strand is completed continuously, while the Okazaki fragments are completed in sections. When this process is completed, 2 identical DNA strands are produced. Each with a 5' to 3' side and a 3' to 5' side.

Explanation:

PLZ HELP DUE IN 30 MINS
1) Why is having no leaves a good adaptation for plants found in the desert?

2) What is the evolutionary significance of developing pouches? (What makes a pouch a good adaptation?)​

Answers

Answer:

1)The leaves and stems of many desert plants have a thick, waxy covering. This waxy substance does not cover the stomata, but it covers most of the leaves, keeping the plants cooler and reducing evaporative loss. Small leaves on desert plants also help reduce moisture loss during transpiration.

A river and all of its streams and tributaries are called a delta.

A. True
B. False

Answers

Answer:A

Explanation: I know my land structures

Is enzyme activity a form of cell regulation

Answers

A critical function of proteins is their activity as enzymes, which are needed to catalyze almost all biological reactions. Regulation of enzyme activity thus plays a key role in governing cell behavior.

Enzymes can be regulated by other molecules that either increase or reduce their activity. Molecules that increase the activity of an enzyme are called activators, while molecules that decrease the activity of an enzyme are called inhibitors.

If you are a candidate for presidential election and you are interviewed in a talk show, how will you answer this question by the host, What will be the first policy that you implement if you will win that would help improve the state of science and technology in the country?​

Answers

Answer:

Government Jobs: Top 10 Interview Questions

Government Jobs: Top 10 Interview QuestionsWhy do you want to work for the government? ...

Government Jobs: Top 10 Interview QuestionsWhy do you want to work for the government? ... Why do you want to work at this agency? ...

Government Jobs: Top 10 Interview QuestionsWhy do you want to work for the government? ... Why do you want to work at this agency? ... Tell us about yourself. ...

Government Jobs: Top 10 Interview QuestionsWhy do you want to work for the government? ... Why do you want to work at this agency? ... Tell us about yourself. ... Why did you leave your last job? ...

Government Jobs: Top 10 Interview QuestionsWhy do you want to work for the government? ... Why do you want to work at this agency? ... Tell us about yourself. ... Why did you leave your last job? ... What do you think of your previous boss? ...

Government Jobs: Top 10 Interview QuestionsWhy do you want to work for the government? ... Why do you want to work at this agency? ... Tell us about yourself. ... Why did you leave your last job? ... What do you think of your previous boss? ... This position is less senior than you

Which of the following descriptions about electrons is correct?
Electrons are located in nucleus
O Electrons are positively charged
The number of electrons in an neutral atom equals to the number of protons in the nucleus
O All electrons in a carbon atom are at the same distance to the nucleus, thus they form a single layer of electron shell

Answers

The number of electrons in a neutral atom equals to the number of protons in the nucleus.

4.
Place the appropriate letter in the blank next to the parts of the small portion of an RNA molecule shown
and draw a line around one nucleotide.
Nitrogen bases
Ribose sugars
Phosphate groups

Answers

Answer:

niphneoix

Explanation:

Which of the following protects the skin against infection by microbes? (Select all that apply)
Antimicrobial peptides
Nerve endings
Dryness
Vitamin D
Acid mantle

Answers

The Antimicrobial peptides and Acid mantle protects the skin against infection by microbes.

The protective functions of the skin

The skin is the largest peripheral organ of the body that protects the body from various types of infection.

This is because it is made up of various parts which include:

Epidermis: This consists of keratinized cells that form a barrier against microbes.

Antimicrobial peptides: These are protein molecules of the innate immune system and are found in the skin. They have potent broad-spectrum antimicrobial properties and help protect the body against infection.

Acid mantle: This is a very fine acidic film on the surface of skin.

Therefore, the Antimicrobial peptides and Acid mantle protects the skin against infection by microbes.

Learn more about the skin here:

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What is the chromosome type in interphase? And what is the happening during that phase?

Answers

Answer:

During interphase (1), chromatin is in its least condensed state and appears loosely distributed throughout the nucleus. Chromatin condensation begins during prophase (2) and chromosomes become visible. Chromosomes remain condensed throughout the various stages of mitosis (2-5).

Explanation:

HELP!!!

Look at the diagrams below. Which diagram shows the proper relationship between
the biosphere and an ecosystem? (A) Drawing A (B) Drawing B (C) Drawing C

Answers

Answer:

it's A

Explanation:

it's A ............

In the rock pocket mouse example, after the lava flow made the ground dark.
The darker fur color in some mutated mice became:
O A favorable trait
O Lighter
O A neutral trait
O A negative trait

Answers

A Favorable trait…..

Why is sickle cell anemia so prevalent in people of African descent?

Answers

Answer:

In heterozygotic individuals, the gene for sickle cell anemia is protective against malaria.

Explanation:

Through the same mechanism that the mutation associated with sickle cell anemia produces the disease (altered hemoglobin structure), having a single copy of the mutation (that is, being heterozygotic) provides protection against malaria. This is believed to be due to the altered structure causing difficulty for the malaria parasite when it attempts to enter red blood cells as part of its life cycle.

Today, there are medications to successfully treat malaria, but it still killed 627,000 people in 2020. This represents a significant evolutionary pressure for genes that would prevent serious malarial illnesses. As malaria  was and still is common in African regions, the result was a higher prevalence of sickle cell anemia in those of African descent.

NO LINKS OR FILES REAL ANSWER draw a diagram of water crossing a membrane by osmosis

Answers

Answer: I could but how do I show

Explanation:

The row of energy in a grassland ecosystem is shown
Hognose snake
Owl
Toad
Spider
Rabbit
Sparrow
Cricket
Grass
Mouse
Based on the diagram, which two populations best represent trophic levels that receive the
LEAST amount of the total energy provided to the ecosystem by the grass?
A Crickets and sparrows
B
Toads and spiders
C Rabbits and mice
D
Hognose snakes and owls

Answers

The populations with the trophic levels that receive the least amount of the total energy from the grass would be Hognose snakes and owls.

Trophic Level

The higher we move up a trophic level, the lower the amount of energy transferred from the previous levels.

More precisely put, only about 10% of the total energy available at one trophic level is transferred to the next while the rest is lost as heat to the surrounding.

In this case, Hognose snakes and owls represent the two highest trophic levels in the ecosystem. Thus, their populations would receive the lowest amount of energy from the producer, the grass.

More on energy transfer in trophic levels can be found here: https://brainly.com/question/13267087

Answer:

D

Explanation:

i just took test

give three function of carbohydrates​

Answers

[tex]\bold{Helloo}[/tex]~

Give three function of carbohydrates.

[tex]\color{purple}\huge\bold\star \underline\mathcal{ \: Answer \: }\star [/tex]

It Provide energy to the body.Sparing the use of proteins for energy.Sugars and dietary fibre.

Let me know if my ans is wrong, [tex]\bold{Thank}[/tex][tex]\bold{U}[/tex]!

[tex]\bold\purple{Hopeithelps}[/tex]

[tex]\bold{Study}[/tex][tex]\bold{Well}[/tex]~

Which of the following is a BEHAVIORAL adaptation?
Sleeping during the day
O Large ears
Camouflage
O Seed production

Answers

Answer:

A

Explanation:

Behavioral adaptation is something an animal does behaviorally, usually to help them survive. Camouflage, large ears, and seed productions are all considered physical adaptations, which leave sleeping through the day as the only choice for behavioral adaptation.

This is because the animal may be nocturnal and needed this adaptation to survive better.

Both the hair and skin contain keratin. When comparing the hair shaft to the skin which layer of the epidermis is most similar?
•Basal limina
•Stratum basale
•Stratum corneum
•Melanocytes

Answers

Answer:straum and straum

Explanation:

they both have the same name

Describe contributions forests make to:
1. Our economy in the form of products.
2. Our social well-being, including recreation
3. Soil protection and increased fertility.
4. Clean water.
5. Clean air. (carbon cycling, sequestration)
6. Wildlife habitat
7. Fisheries habitat
8. Threatened and endangered species of plants and animals

Answers

Explanation:

Answer:Crop Production. – Tillage. – No-till ... Kansas Clean Drinking Water Fee fund (administered by the ... plants and stores water and nutrients long enough for the plants to make use of them. ... refers to soil as the “Earth's living skin,” saying that the majority of the ... At each level of consumption, waste and organic materials are.

Obese humans probably have high levels of leptin because

Answers

Obese humans probably have high levels of leptin because the brain does not respond to leptin, so they keep eating despite adequate (or excessive) fat stores

Select all that apply !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Which of the following can occur during an earthquake? Select all that apply.


Cliffs and cracks form

Sections of the crust are demolished into clouds of dust

Part of the crust may sink under the ocean

Crust can fold or wrinkle

Answers

Answer:

Cliff and Cracks, Sink under ocean I know for sure.

Explanation:

We have mountains because of convergent plates. they push eachother up and make cliffs. i also know sink under the ocean because we have underwater volcanoes for that reason

Part of the crust may sink under the ocean.

History is the biggest witness of it.Many times in past the crust of earth sinked down in ocean due to earthquake and the crust below the ocean came up(Formation of Newzealand)

What is the best explanation for extinction of various species?

A. Dramatic Climate Change

B. Survival of the Fittest

C. Disease Ridden Plants

Answers

Answer:

I believe it would be Dramatic climate change

Explanation:

With our earth constantly changing, the species living in the climate that is being erased are dying out because of the loss of their habitat

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