Question

The minimum length of cistron in base pair, which can synthesise a polypeptide of 50 amino acids is

• A. 51 bp
• B. 106 bp
• C. 153 bp
• D. 206 bp

Answer 1

The correct option is C 153 bp

Cistron is a segment of DNA that codes for one polypeptide. The polypeptide has 50 amino acids, then its cistron will have at least 51 codons (50 codons for amino acids and 1 codon is the stop codon). Each codon is a triplet, so for 50 amino acids, the minimum length of cistron will be 51 x 3 = 153 bp (base pairs).