STANDARDZoology-Molecular Basis of Inheritance
STANDARD Zoology Structure of DNA MCQ Question
Type: MCQ-conceptual-Medium-Class 12
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
Correct Answer
Option B
Detailed Explanation
DNA consists of two strands that are wrapped around one another to form a double helix. It has antiparallel direction, one in 5' → 3' direction and the other in 3' → 5' direction. It forms complementary base pairing with purine and pyrimidine (A = T and G = C).
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