How many possible tetrapeptides can be made using all four of the amino acids D,W,F,and R?

Name: How many possible tetrapeptides can be made using all four of the amino acids D,W,F,and R?
Brand: Quizplus
Rating: 4.8 (54 reviews)

Question

Quizplus · Accepted Answer

There are four positions to be filled with the four amino acids, therefore there are 4 choices for the first, 3 choices for the second, 2 choices for the third, and 1 choice for the fourth position. Therefore, the total number of possible tetrapeptides is 4 x 3 x 2 x 1 = 24.

How Many Possible Tetrapeptides Can Be Made Using All Four