Proteins

Question 1

What are proteins?

Answer 1

Polypeptides

Question 2

What functions can proteins have?

Answer 2

Structure, metabolism, gene regulation, signalling, development

Question 3

What property do all amino acids apart from glycine have?

Answer 3

Chirality

Question 4

What kind of bond links amino acids in polypeptides?

Answer 4

The peptide bond between amino and carboxyl groups

Question 5

What kind of bond does the peptide bond act like?

Answer 5

Double bond. Ie there is fixed rotation

Question 6

What is a general structure of proteins?

Answer 6

linear unbranched heteropolymers

Question 7

What are the 2 types of secondary structure

Answer 7

alpha helix and beta pleated sheet

Question 8

What bonds are present in tertiary structure

Answer 8

Ionic bonds, hydrophobic interaction, disulphide bridge, hydrogen bonds

Question 9

Can proteins have both an alpha helix and a beta pleated sheet

Answer 9

yes

Question 10

What is quarternary structure

Answer 10

Only if there is more than one polypeptide chain, identica or different polypeptide chains are subunits

Question 11

Name a disease in which depends on protein structure

Answer 11

Sickle cell anaemia

Question 12

What technique can detect different types of proteins along zones?

Answer 12

Serum protein electrophoresis