Question

how many codons are known to code for the amino acid threonine?
a 4
b 6
c 3
d 2

Explanation:

To determine the number of codons coding for threonine, we refer to the genetic code. Threonine (Thr) is encoded by the codons ACU, ACC, ACA, and ACG. This gives a total of 4 codons.

Answer:

a. 4