B1.2 Proteins

Question 1

What is a dipeptide?

Answer 1

Peptide with 2 monomers

Question 2

What is a polypeptide?

Answer 2

Peptide with many monomers

Question 3

What is the optimum temperature for a protein?

Answer 3

37

Question 4

What is denaturation?

Answer 4

When a protein loses its shape due to pH or temperature, and cannot carry out functions

Question 5

What are the 5 R groups?

Answer 5

1. Non polar, aliphatic
2. Polar, uncharged
3. Positively charged
4. Negatively charged
5. Non polar, aromatic

Question 6

What does ‘confirmation’ mean in protein structure?

Answer 6

The 3 dimensional shape that a protein adopts as it folds

Question 7

What is the primary structure of a protein?

Answer 7

Amino acids linked together by peptide bonds

Question 8

What is the secondary structure of a protein?

Answer 8

• hydrogen bonds
• form: alpha helix, a beta pleated sheet

Question 9

What is the tertiary structure of a protein

Answer 9

• form 3 dimensional shape
• held together by interaction between R groups

Question 10

Which types of R groups are involved in the tertiary structure?

Answer 10

• hydrogen bonds
• ionic bonds
• disulfide bonds
• hydrophobic interactions

Question 11

What are the effects of polar and non polar amino acids on tertiary structure of proteins?

Answer 11

• hydrophilic polar amino acids go outside
• hydrophobic non polar amino acids are protected in the core

Question 12

What are the 2 protein structures?

Answer 12

Globular & Fibrous

Question 13

Give an example of an fibrous protein

Answer 13

Keratin, collagen, elastin

Question 14

Give an example of a globular protein

Answer 14

Insulin, haemoglobin

Question 15

Give an example of an conjugated protein

Answer 15

Haemoglobin

Question 16

Give an example of an non-conjugated protein

Answer 16

Insulin