How many possible tetrapeptides can be made using all four of the amino acids D, W, F, and R?
A) 4
B) 6
C) 12
D) 24
E) none of the choices

Question

Quizplus · Accepted Answer

A tetrapeptide consists of four amino acids. Since there are four different amino acids (D, W, F, R) and each position in the tetrapeptide can be occupied by any of these four amino acids without repetition, the total number of possible tetrapeptides is calculated by permutation: 4! = 4 × 3 × 2 × 1 = 24.

How Many Possible Tetrapeptides Can Be Made Using All Four