Question

The peptide alanylglutamylglycylalanylleucine has: No free carboxyl groups Four peptide bonds A disulphide bridge Two free amino groups

Answer 1

Four peptide bonds

Step-by-step explanation:

The structure of alanylglutamylglycylalanylleucine is shown below.

It has four peptide (CO-NH) bonds, marked in red.

A is wrong. there are two carboxyl groups (green): The C-terminal end of leucine and the sidechain of glutamic acid.

C is wrong. There is no sulfur in the compound.

D is wrong. There is only one free amino group (blue): at the N terminal end of alanine.