Q. In the DNA molecule,
A) The total amount of purine nucleotides and pyrimidine nucleotides is not always equal
B) There are two strands, which run parallel in the 5’$\rightarrow$3’ direction
C) The proportion of adenine in relation to thymine varies with the organism
D) There are two strands, which run antiparallel-one in 5’$\rightarrow$3’ direction and other in 3’$\rightarrow$5’
Explanation
The two strands run antiparallely, $i.e$., one strand has phosphodiester linkage in 3’$\rightarrow$5’ direction, while other strands has phosphodiester linkage in 5’$\rightarrow$3’ direction.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.