Proteins

Question 1

Monomer of proteins

Answer 1

amino acids

Question 2

Polymer of proteins

Answer 2

Polypeptide

Question 3

Amino acid structure

Answer 3

amino group + C + carboxyl group + H + R group (side chain)

Question 4

How does the sequence of amino acids effect a protein?

Answer 4

Changes the structure and function

Question 5

Protein functions

Answer 5

• Signalling
• Structural
• Transporting
• Enzymatic
• Regulatory
• Storage
• Defence (antibody)

Question 6

Primary protein structure

Answer 6

Amino acids form polypeptide chain with peptide bonds

Question 7

Secondary protein structure

Answer 7

Hydrogen bonds between atoms in polypeptide backbone
- Alpha helix
- Beta folded sheet

Question 8

Tertiary protein structure

Answer 8

Stabilized by R group interactions
- Hydrophilic and hydrophobic clustering
- Hydrogen bonds
- Ionic bonds
- Disulphide bridges
- Covalent bonds

Question 9

Quaternary protein structure

Answer 9

Interactions between multiple polypeptide chains
- Hydrophilic and hydrophobic clustering
- Hydrogen bonds
- Ionic bonds
- Disulphide bridges
- Covalent bonds
- Van der Waals forces

Question 10

Globular proteins

Answer 10

Round shape
Polar
Water soluble
Irregular amino acid sequence
Sensitive to environmental changes

Question 11

Fibrous proteins

Answer 11

Long strand-like shape
Non-polar
Not water soluble
Repetitive amino acid sequence
Resistant to environmental changes

Question 12

Globular protein examples

Answer 12

Haemoglobin- transports O to blood for aerobic respiration
Insulin

Question 13

Fibrous protein examples

Answer 13

Collagen- main component of connective tissue