Question

Nitrogenous bases pair up in a specific way. which of the following pairings is correct?

a. a↔c
b. t↔g
c. a↔g
d. c↔
e. a↔t
f. c↔g

Answer 1

The answer is e and f. The correct pairings for nitrogenous bases in DNA are adenine (A) with thymine (T), and cytosine (C) with guanine (G).

Step-by-step explanation:

The correct nitrogenous base pairing in DNA is adenine (A) pairing with thymine (T), and cytosine (C) pairing with guanine (G). So among the options given, the correct pairings would be e. A↔T and f. C↔G. These specific pairings are due to hydrogen bonding, with A and T sharing two hydrogen bonds and C and G forming three, which ensures that the distance between the bases is such that the electrostatic force is sufficient to hold the nucleotide bases together, preserving genetic information during cell division.

These pairings are important for maintaining the genetic information during cell division and DNA replication. Adenine always bonds with thymine using two hydrogen bonds, and cytosine always bonds with guanine using three hydrogen bonds.