Analysis of a single stranded DNA sample reveals 10% dG content which statements

Question

Analysis of a single stranded DNA sample reveals 10% dG content which statements about the composition of this single stranded DNA must also be true? I. A. dC#1096 B. dA 40% C. dT=4096 D. dG + dC= 2096 CDdC+dA + dT = 90% F. All of the above G. None of the above Analysis of a double stranded DNA sample reveals 10% dG content, which statements about the composition of this double stranded DNA must also be true? E 2, A. dCm 10% B. dA 40% C. dT = 40% D. dG+ dC=2096 E. dC + dA + dT = 90% All of the above G. None of the above

Explanation / Answer

(1)

In this case since the DNA is single stranded, we cannot make use of the combinations and hence nothing can be said about dC alone. So the only option we have is to make use of the relation:

dA + dT + dG + dC = 100%

So, Putting dG = 10%, we get:

dA + dT + dC = 90%

(2)

In this case since the DNA is double stranded, we know that amount of dC will be equal to that of dG because dC binds only to dG and dA binds only to dT.

So,

dG = dC = 10%

Making use of the relation:

dA + dT + dG + dC = 100%, and

dA = dT

We have:

dA = dT = 40%

So all the relations given in this case in options (a), (b), (c), (d) and (e) hold true.

Hope this helps !

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