amino acids and protein

Question 1

Amino acids are ………. blocks of ………..

Answer 1

building

protein

Question 2

Amino acids are ……… soluble and ………. Charged at physiological …. Each amino acid differs in the properties of its …….. …….

Answer 2

water soluble
electrically charged
pH
side chain

Question 3

In polypeptides, amino acids are linked by ……. …….. Side chains are ….. involved in peptide bonding

Answer 3

peptide bonds

NOT

Question 4

Direction of polypeptides, first amino acid has ….. group ..terminal end. Last amino acid has …. Group ..terminal end

Answer 4

NH3+
N-
COO-
C-

Question 5

hydrolysis only ………. and ………..

Answer 5

digestion

lyosome

Question 6

The protein primary structure is a ……… of amino acids in a ……

Answer 6

sequence

peptide

Question 7

The secondary structure is ……… or ……… of peptide chain (a-helix/b-pleated sheet)

Answer 7

folding

coiling

Question 8

The tertiary structure peptide chain ……. …….. ………

Answer 8

fold upon itself

Question 9

The quaternary structure the folded peptide …… …… ………

Answer 9

chains going together

Question 10

a-helix is formed by …… in the same ……. chain. regular ……….. helix. … residues. …….. on the outside

Answer 10

H-bonds 
polypeptide
right-handed
3.6
R groups

Question 11

B-pleated sheets …….. ……. chains. ……….. between peptide chains holds strands together

Answer 11

liner peptide

H-bonding

Question 12

Two types of B-sheet structures

Answer 12

antiparallel - widespread in globular proteins

parallel - arrows point to C terminus

Question 13

Haemoglobin has ..% of its structure as a-helix

Answer 13

60

Question 14

covalent bond that stabilises the protein structure

Answer 14

disulphide bridges

Question 15

non-covalent bonds that stabilise the protein structure

Answer 15

hydrogen bonds
electrostatic interactions
van-der Waals forces
hydrophobic effect

Question 16

Van der Waals forces is the sum of the …….. or …….. forces between ……….

Answer 16

attractive
repulsive
molecules

Question 17

Hydrophobic effects are unable to form …….. ……..

Answer 17

hydrogen bonds