Question

A double stranded piece of DNA is determined to be 35% A. What percent of C is in the same piece of DNA?

Answer 1

I'll give you some info that could help you answer this question.

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DNA is made of four kinds of nucleotides.

A (adenine)

T (thymine)

C (cytosine)

G (guanine)

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A has the same amount as T
G has the same amount as C

Take a look at the problem.

It says that the DNA is 35% A.

Remember, A has the same amount as T.

So...if the DNA is 35% A,
then it's also 35% T.

Does that make sense?

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Okay.
So the DNA is 35% A,
and 35% T.

35 + 35 = 70

That means that A and T, together, equal 70% of the DNA.

BUT we haven't talked about G and C, yet.

If A and T equal 70%,
then G and C must equal 30%.

Does that make sense?

70% + 30% = 100%, after all.

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G + C = 30.

G and C have the same amount.

So here's the BIG question:
** What does C equal?

Answer 2

right you are........