Question

Which of the followings are TRUE for a DNA molecule?

(a) antiparallel strands
(b) purine-pyrimidine pairs
(c) six-carbon sugar
(d) a and b
(e) a and c

Answer 1

DNA is made up of two anti-parallel strands twisted around each other. Adenine pairs with thymine and cytosine pairs with guanine.

Step-by-step explanation:

DNA is made up of two strands that are twisted around each other to form a helix. Adenine pairs up with thymine and cytosine pairs with guanine.

The two strands are anti-parallel in nature; that is, the 3' end of one strand faces the 5' end of the other strand. Only sugar contributes to the DNA structure.