Peptide bonds

Question 1

In order to form a peptide bond a ………… is lost from the …….. group of one amino acid and a ………… is lost from the ……… group of another amino acid

Answer 1

hydroxyl (-OH)

carboxylic

hydrogen atom

amine

Question 2

The remaining carbon atom (with the double-bonded oxygen) from the first amino acid bonds to the

Answer 2

nitrogen atom of the second amino acid

Question 3

This is a condensation reaction so

Answer 3

Water is released

Question 4

Dipeptides are formed by the

Answer 4

condensation of two amino acids

Question 5

Polypeptides are formed by the

Answer 5

condensation of many (3 or more) amino acids

Question 6

A protein may have only one polypeptide chain or it may have multiple chains interacting with each other

Question 7

During hydrolysis reactions, the addition

Answer 7

of water breaks the peptide bonds resulting in polypeptides being broken down to amino acids