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3 years ago

Which structure forms as DNA unwinds? A. a special marker B. a complementary base C. a replication bubble D. a double helix

Biology

1 answer:

kozerog [31]3 years ago

5 0

A replication bubble forms as the DNA unwinds.

Option C

<u>Explanation</u>:

Replication bubble is the space where the strands of double helical DNA structure are separated with the help of DNA helicase. The strands of the double helical DNA are still in the helix form on the both end of the unwinded DNA stand which gives this region an appearance of a bubble.

DNA unwinding is the first step in replication or transcription of the DNA molecule. DNA helicase separates the two types of "DNA" that are connected by hydrogen bonds with the help of ATP hydrolysis.

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After doing PCR on the same region between two individuals, you notice that each person's DNA yielded pieces of different sizes.

vitfil [10]

Answer:

C. This is an example of VNTRs.

Explanation:

VNTRs are Variable Number Tandem Repeats. These are short sequences of DNA repeated in tandem (that is, the sequences are repeated one next to the other) a certain number of times. Unrelated individuals have a different number of repetitions for a certain region of the DNA, therefore the total length of the fragment is variable among individuals, depending on how many times the short sequence is repeated.

3 0

3 years ago

Why is a squid classified as a cephalopod?

Papessa [141]

Its a mollusc (i think that helps?)

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3 years ago

The plasma of our blood constitutes ______ than half of the fluid in our body; plasma is part of the _____________ fluid.

Vaselesa [24]

Answer: Less\ Extracellular

Explanation: The plasma of our blood constitutes less than half of the fluid in our body; plasma is part of the extracellular fluid.

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2 years ago

A population of white moths lives in a forest near a factory. this factory burns coal and pollutes the air with black dust. over

marissa [1.9K]

The answer to your question is option b

This is because if the trees are black, and covered with soot due to the pollution, caused by industrialisation, the white moths will be easily seen and constantly hunted by the predator, compared with the black moth population as they camouflage easily. Ultimately, the white moths would be hunted to such an extent that their population would dramatically decrease

8 0

3 years ago

Explain the role of a hypothesis in a scientific investigation.

k0ka [10]

Answer:

A hypothesis is a testable proposition

used to explain scientific phenomena. It

may be based on previous observations

(a sort of educated guess) or it may

simply be a hunch. Most scientific

hypotheses are combinations of

observation and intuition. The important

thing is that the hypothesis be testable.

If the hypothesis is disproved through

testing, then it is discarded and a new

hypothesis is proposed. If the hypothesis

stands up to rigorous testing, then our

faith in the hypothesis is increased.

This system of careful, rigorous, and

unbiased testing of a hypothesis is what

characterizes the scientific method.

Hope it helps!

4 0

3 years ago