What can cause changes in DNA sequences

Answers

Answer 1

Answer:

Ans. Mutation.

Mutations are defined as permanent changes in the nucleotide sequence of DNA molecules that transmit from generations to generations.

These mutations may arise naturally (during DNA replication) or due to the exposure to mutation-causing agents (mutagens), such as UV-rays, ethidium bromide, and free radicals.

Thus, the correct answer is 'mutations.

Answer 2

Answer:

The answer is : Mutations

Mutations can cause changes in DNA

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8. Some saliva was mixed with water and placed in a test-tube labelled A to which some boiled, cooled starch was added. Two other test-tube B and C were prepared as follows: Test-tube B-water and saliva Test-tube C water and starch. The three test-tube placed in water bah at 37°C and allowed to stand in the water for 5 minutes. A few drops were removed from each test-tube with a piece of glass tubing and tested with iodine solution and Benedict's solution. (a) Which of the test-tubes contained a solution that gave an orange precipitate with Benedict's solution? (1 mark)

Answers

Answer:

Explanation:

Solution:

Experiment:

Boiled potato is used here in mashed form and separated into three parts.

Separate them in test tube A, test tube B and test tube C.

In the test tube A, iodine is added.

In the test tube B, iodine is added and then saliva is introduced.

In test tube C, nothing is added and kept as the control set.

Observation:

The test tube A, the iodine solution changes the boiled potato to blue color.

In the test tube B, saliva is introduced and mixed with the sample after adding iodine.

As a result, the color change will be observed when starch will be broken down to simple sugars like maltose.

The blue color starts reducing in the test tube B as the saliva containing the salivary amylase starts acting on the starch.

Test tube C shows no color change.

Inference:

The change in the test tube containing saliva shows the effect of salivary enzymes like salivary amylase on the boiled starch present in potato.

that all I hope it will help

What is the first step of protein synthesis?

Answers

Transcription of mRNA from a DNA gene in the nucleus

the DNA unzips and then the mRNA copies half of the DNA

How old is a rock that has 70% of it's original K-40

Answers

The correct answer is 0.2167 billion years old. Hope thsi helps.

35% i know that for sure

Which soil layers comprise the topsoil?

Answers

Answer:

A-Horizon and O-Horizon.

Explanation:

O-Horizon is the top layer of the soil made up almost entirely by decomposed organic matter. A-Horizon its found below and is where the seeds germinate, it is made of hummus combined with mineral particles.

The topsoil has the highest concentration of organic matter and is where Earth´s biological activity occurs.

I hope this answer helps you.

A Horizon and O Horizon

Hope This Helps, :)

1. What function does the shape of the star-nosed mole's nose serve?- It helps the mole breath under water
-It helps the mole eliminate excess heat.
- It helps the mole find food.
- It helps the mole dig out its burrow.

Answers

The star-nosed mole does prefer wet, poorly drained areas and marshes. It is a good swimmer and can forage along the bottoms of streams and ponds.
The best answer to the question above is the second option.It helps the mole eliminate excess heat.

Which of the following describes the pathway that nerve impulses travel while throwing a baseball?A. motor neuron, spinal chord, sensory neuron, to muscles
B. sensory neuron, spinal chord, motor neuron, to muscles
C. motor neuron, brain, sensory neuron, to muscles
D. sensory neuron, brain, motor neuron, to muscles

Answers

The correct answer is A.

Answer:

the correct answer is A.) motor neuron, spinal cord, sensory neuron, muscles

Explanation: because its just the answer AND I OOOOOOOOP F RESH A VA CADOOOH

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