Question

Which of the following depicts correct base-pairing in DNA?

A-G-A
B-A-U
C-C-T
D-T-A

Answer 1

In DNA, adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C), so the correct answer is D-T-A.

Step-by-step explanation:

The correct base-pairing in DNA is described by the pairing rules initially discovered by Erwin Chargaff and later elaborated upon by Watson and Crick. In DNA, adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C). These base pairs are held together by hydrogen bonds, which are essential for the structure and function of DNA. Therefore, from the given options, the correct base-pairing depiction in DNA is D-T-A, meaning T pairs with A.

Answer 2

D. T- A

Step-by-step explanation:

In dsDNA the bases in the two strands are paired through hydrogen bonds forming base pairs (bp). Adenine forms two H-bonds with thymine from opposite strand and vice-versa. Similarly, guanine is bonded with cytosine with three H-bonds. As a result, always a purine comes opposite to a pyrimidine.

A - T & G - C