Which of the following clusters of terms accurately describes DNA as it is gener

Question

Which of the following clusters of terms accurately describes DNA as it is generally viewed to exist in prokaryotes and eukaryotes?

double-stranded, parallel, (A + T)/C + G) = 1.0, (A + G)/(C + T) = 1.0 double-stranded, antiparallel, (A + T)/C + G) = variable, (A + G)/(C+ T) = 1.0 double-stranded, antiparallel, (A + T)/C + G) = variable, (A + G)/(C + T) = variable single-stranded, antiparallel, (A + T)/C + G) = 1.0, (A + G)/(C + T) = 1.0 double-stranded, parallel, (A + T)/C + G) = variable, (A + G)/(C + T) = 1.0

Explanation / Answer

Answer:

DNA is a double stranded molecule and runs in an anti parallel direction, that means that runs in opposite directions, one from 5’—> 3’ and the other from 3’ —> 5’. These strands are complementary to one another. According to Chargaff’s rule

A + G = C + T , this implies,

(A+G) / ( C+T ) = 1

But, the ratio of (A+ T) / (C + G) is variable and it varies from species to species, though, it is constant within a species.   

double-stranded, antiparallel, (A + T)/C + G) = variable, (A + G)/(C+ T) = 1.0

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