Question

Human insulin has 50 amino acid in its protein sequence. The segment of DNA that codes for the 51 amino acids in insulin has..

A) 17 nucleotides
B) 50 nucleotides
C)100 nucleotides
D)150 nucleotides

Answer 1

Answer: Option D; 150 Nucleotides

Amino acids have their codons in form of set of three nucleotides. So if there are 51 amino acids, it means the number of nucleotides would be -

1 amino acid = 3 bases/ nucleotides

51 amino acids = 51 * 3 = 153 nucleotides

Since the nearest answer is 150, option D is the correct answer.

This is the basic concept of relation between DNA and protein synthesis.