The instructions for making amino acids are on about 3 billion pairs of chemicals called "_____ pairs."
A) couple
B) foundation
C) base
D) copy

Question

Quizplus · Accepted Answer

The instructions for making amino acids are coded in DNA, which is made up of nucleotides that contain four types of nitrogenous bases: adenine (A), guanine (G), cytosine (C), and thymine (T). These bases pair up with each other (A with T, and C with G) to form the rungs of the DNA double helix ladder. Therefore, the missing word in the sentence should be "base pairs", as they are the fundamental units of the genetic code.

The Instructions for Making Amino Acids Are on About 3