Q.

While analysing the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were adenine = 29%, guanine = 17%, cytosine = 32%, thymine = 17%. Considering the Chargaff's rule it can be concluded that

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a

it is a double-stranded circular DNA

b

it is a double-stranded linear DNA

c

it is single-stranded DNA

d

No conclusion can be drawn

answer is B.

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Detailed Solution

According to Chargaff's rule of base pairing
i.e., AT=GC=1
For the given organisms, the DNA does not follow Chargaff's rule as AT=27173217=GC1
Hence, it can be concluded that it is a single-stranded DNA, not double-stranded.

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