B1.2 Proteins

Question 1

Name some examples of biological proteins

Answer 1

Haemoglobin
Enzymes
Amino acids
Glycoproteins
Antibodies

Question 2

What is the primary structure of protein?

Answer 2

The sequence of amino acids in the polypeptide chain

Question 3

Name the 2 features of the secondary structure of protein

Answer 3

Alpha helices & beta pleated sheets

Question 4

Name 3 types of bonds that stabilise the tertiary structure of a protein

Answer 4

Hydrogen bonds
Ionic bonds
Disulphide bridges

Question 5

Name a bichemical test for proteins

Answer 5

Biuret test

Question 6

What is a prosthetic group? Why are they important in some proteins?

Answer 6

A non-protein part of the molecule which helps the functioning part of the protein

Question 7

What is in a common structure of an amino acid?

Answer 7

R group
Carboxyl group
Amine group

Question 8

What is the simplest amino acid?

Answer 8

Glycine

Question 9

What is a peptide made up of 2 monomers called?

Answer 9

Dipeptide

Question 10

What is a peptide made up of many monomers called?

Answer 10

Polypeptide

Question 11

Amino acids have the same basic structure, but different ……………..

Answer 11

R groups (side chains)

Question 12

Amino acids always include…

Answer 12

1. An amino group (NH 2)
2. Carboxyl group (COOH)

Question 13

The 9 amino acids that must be obtained from your diet are called…

Answer 13

Essential amino acids

Question 14

What happens to the protein structure if the bonds break?

Answer 14

Unravel, protein no longer function

Question 15

What are 2 key factors that could cause the bonds to break & protein to unravel?

Answer 15

pH & temperature

Question 16

What is the optimum temperature for the human body?

Answer 16

37 degrees

Question 17

What happens when the optimum temp is exceeded?

Answer 17

Denature, loses 3D shape