AIPMT PRELIMS 2008 Botany DNA Structure MCQ Question with Solution

In the DNA molecule:

A

the proportion of adenine in relation to thymine varies with the organism

B

there are two strands which run antiparallel one in 5'→3' direction and other in 3'→5'

C

the total amount of purine nucleotides and pyrimidine nucleotides is not always equal

D

there are two strands which run parallel in the 5'→3' direction

Option B

DNA strands are antiparallel, meaning one strand runs in the 5' to 3' direction while the complementary strand runs in the 3' to 5' direction.

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AIPMT PRELIMS 2008 Botany DNA Structure MCQ Question