Question

Which sequence of codons specifies for leucine-threonineproline?

• A. CUC-GCU-CCC
• B. AAA-ACC-CCC
• C. UUG-AGC-UAG
• D. CUA-ACA-CCU

Answer 1

Answer: (D)

A particular $mRNA$ codon codes for a particular amino acids. As there are $64$ codons and only $20$ amino acids thus more than one codon can code for a single amino acids.

Amino acid		Codons
(i)	Leucine	CUU, CUC, CUA, CUG, UUA, UUG
(ii)	Threonine	ACU, ACC, ACA, ACG
(iii)	Proline	CCU, CCC, CCA, CCG