Peptides, polypeptides, and proteins

Question 1

what is a polypeptide

Answer 1

contraining up to about 50 amino acids are referred to as polypeptides

Question 2

What are proteins?

Answer 2

contain more than 50 amino acid

Question 3

What are some natural examples of proteins?

Answer 3

enzymes

hair

mucles

Question 4

What is the amide functional group?

Answer 4

-CONH₂

_{C=O double bond present}

Question 5

What is an amine linkage?

Answer 5

-CONH-

the amine group of one amino acid can react with the carboxylic acid group of another to form an amide linkage

peptide bond

Question 6

What type of polymers are polypeptides and proteins?

Answer 6

condensation polymer because a small molecule (in this case water) is eliminated as each link of the chain forms

Question 7

How does hydrolysis occur?

Answer 7

• protein or peptide boiled with hydrochloric acid (conc 6mol dm^-3) for about 24 hours
• breaks down to a mixture of all the amino acids that made up the original protein or peptide
• all the peptide linkages are hydrolysed