NEET BIOLOGY

Detailed explanation-1: -DNA molecule is a helix with bases stacked perpendicularly to the main axis of the molecule. The two strands of a DNA, double helix are called complimentary due to specific base pairing, i.e, each chain has a sequence of nucleotides attached together by phosphodiester bonds joining the adjacent deoxyribose molecules.

Detailed explanation-2: -The two strands are complementary to each other. That is, adenine forms two hydrogen bonds with thymine from the opposite strand and vice-versa. Guanine forms three hydrogen bonds with cytosine from opposite strands and vice versa. This helps in maintaining a uniform distance between the two strands.

Detailed explanation-3: -The strands of a DNA double helix are said to be “antiparallel” because the have the same chemical structure, but are opposite in direction.

Detailed explanation-4: -In biochemistry, two biopolymers are antiparallel if they run parallel to each other but with opposite directionality (alignments). An example is the two complementary strands of a DNA double helix, which run in opposite directions alongside each other.

Detailed explanation-5: -antiparallel definition. A term used to describe the opposite orientations of the two strands of a DNA double helix; the 5’ end of one strand aligns with the 3’ end of the other strand.