How many different amino acids are obtained by hydrolyzing all the peptide bonds in the following polypeptide?
A)1
B)2
C)3
D)4

Question

How many different amino acids are obtained by hydrolyzing all the peptide bonds in the following polypeptide? 
A)1 
B)2 
C)3 
D)4

Quizplus · Accepted Answer

To determine the number of different amino acids in a polypeptide chain, we need to count the number of peptide bonds. Since the given polypeptide has 4 peptide bonds, there must be 4 different amino acids. However, we need to take into account the possibility of two or more peptide bonds linking the same amino acid.

The given polypeptide sequence is:
11eb6911_3975_6f11_bb3a_a9d36e35bf20_TB8309_00

The amino acid sequence can be determined by reading the one-letter codes for each of the 20 standard amino acids. We can see that there are three different amino acids in the sequence:

1. Alanine (A): occurs twice
2. Asparagine (N): occurs once
3. Glutamic acid (E): occurs once

Therefore, the answer is C)3.

How Many Different Amino Acids Are Obtained by Hydrolyzing All