Protein

Question 1

Zwitterion

Answer 1

No net charge

Question 2

Amino acid sequence

Answer 2

Peptide bonds + H20

Polypeptide

Question 3

Psi bond

Answer 3

Calpha - carbon

Question 4

phi bond

Answer 4

C alpha - N

Question 5

Isoelectric point

Answer 5

pH at which zwitterion exists

Question 6

Alpha helix

Answer 6

Right handed helix
Compact
Can exist as one strand
Side chains outside

Question 7

Beta sheet

Answer 7

Extended
R groups on both sides
Need to have more than 1 strands
3 types: Antiparallel - less stable , parallel

Question 8

Fibrous protein

Answer 8

Used to : support, shape, protection
Structure: long strands, sheets, simple
Secondary structure - 1 type that repeats
Example- collagen

Question 9

Globular proteins

Answer 9

Used In catalysis and regulation
Compact shape
Several types of secondary structure
Example:carbonic anhydrase

Question 10

Motifs

Answer 10

In beta sheet folding elements that contain 1 or more elements of the secondary structure

Question 11

Domains

Answer 11

Region of a polypeptide that fold into a specific shape for a functional role

Question 12

Disulphides bonds

Answer 12

Between cysteine residues

Oxidation reaction

Question 13

Chaperones

Answer 13

Aid folding

Question 14

Enzymes

Answer 14

Biological catalysts
Not used up - reusable 
Alternate pathway requiring lower activation energy 
Does not affect equilibrium 
Specific

Question 15

Active site

Answer 15

Hydrophobic cleft excluding water

Question 16

Michaelis menten equation

Answer 16

E + S — ES — E + P

Vo = Vmax x [S] / km + [S]

Question 17

1 unit

Answer 17

Amount of enzyme that converts 1 micromole of product per minute per litre of serum or gram of tissue