Answer to Question #214502 in Molecular Biology for Moe

Question

2.2) Two chains of DNA must run in _________ direction(s) and must be ________ if they are to bond with each other.

1. The same; uncomplementary.
2. Opposite; uncomplementary.
3. Parallel; uncomplementary.
4. Parallel; complementary.
5. Antiparallel; complementary.

Answer 1

The answer is 5. Antiparallel; complementary.

Explanation -

The two strands of DNA are antiparallel i.e. the 5' → 3' direction and the two DNA chains are held together by complementary base pairing between A and T bases and between G and C bases.