Proteins

Question 1

The primary bond which holds secondary structures together are

Answer 1

H-bonds

Question 2

Alpha helixes are held together by hydrogen binding between

Answer 2

Oxygen and every 4th amino acid

Question 3

Which amino acid is an alpha helix breaker and why

Answer 3

Proline because of its ring structure

Question 4

Common amino acids found in beta sheets are

Answer 4

Glycine and proline

Question 5

What are motifs

Answer 5

Combination of secondary structures

Question 6

Superoxide dismisses is an enzyme which catalyze

Answer 6

Dismutation of O2 into other forms of oxygen.

Question 7

The following are cofactors of superoxide doing ismutase

Answer 7

Cu, and Zn

Question 8

The main interactions which hold tertiary structures together are

Answer 8

Hydrophobic interactions

Question 9

Hydrophobic interactions in tertiary structures are held by which amino acids

Answer 9

Aliphatic (valine, leucine, isoleucine)
And aromatic (phenylalanine and tryptophan0

Question 10

Other bonds that occur in tertiary structure (aside from hydrophobic) are

Answer 10

Electrostatic
H-bonds
Disulfide bonds

Question 11

Collagen has a ________structure

Answer 11

Triple helix

Question 12

Collagen mainly consists of

Answer 12

33% glycine
10% proline

Question 13

Protein folding is dictated by_______ particularly

Answer 13

Amino acid sequences; nonpolar amino acids

Question 14

Denaturing of a protein can be done by

Answer 14

Heat
Urea

Question 15

Denaturing agents destroy the _______ and _________structures

Answer 15

Secondary; tertiary

Question 16

Phosphorylation

Answer 16

Adds a phosphate to serine, threonine or tyrosine

Question 17

Glycosylation

Answer 17

Attaches a sugar to a an N or O in an amino acid side chain

Question 18

Acetylation

Answer 18

Adds an acetyl group to the N-terminus of a protein, increasing stability

Question 19

Disulfide bonds

Answer 19

Covalently links S atoms of 2 different cysteine residues

Question 20

Ubiquitination

Answer 20

Adds ubiquittin to a lysine residue of a protein marking it for destruction

Question 21

Lipidation

Answer 21

Attached a lipid to a protein chain