Proteins

Question 1

What is an R group?

Answer 1

A functional group

Question 2

How many naturally occurring amino acids are there?

Answer 2

20

Question 3

What bond is formed by a condensation reaction between amino acids?

Answer 3

Peptide

Question 4

What is primary protein structure and what bonds does it contain?

Answer 4

sequence of amino acids linked by peptide bonds

Question 5

What is secondary protein structure and what bonds does it contain?

Answer 5

folding of primary structure into an alpha helix or a beta pleated sheet, held by hydrogen bonds

Question 6

What is tertiary protein structure and what bonds does it contain?

Answer 6

further folding into a complex and specific 3D structure, held by disulphide, ionic, hydrogen and hydrophobic bonds between -R groups

Question 7

What is quaternary protein structure and what bonds does it contain?

Answer 7

two or more polypeptide chains in tertiary form bonded together, held by disulphide, ionic, hydrogen and hydrophobic bonds between -R groups

Question 8

Are enzymes, antibodies and hormones globular or fibrous?

Answer 8

globular, as they must be soluble

Question 9

Name a fibrous protein

Answer 9

Collagen, keratin