PROTEINS

Question 1

Proteins

Answer 1

polymers of amino acids

Question 2

peptide bonds

Answer 2

form between amino acids to make proteins

Question 3

amino acid structure

Answer 3

H
|
NH3 - C - COOH
|
R

Question 4

protein primary structure

Answer 4

sequence of amino acids

Question 5

secondary protein structure

Answer 5

chain of amino acids folds into an alpha helix or beta pleated sheet

Question 6

tertiary structure proteins

Answer 6

coils and pleats fold into 3d protein shape
h bonds
ionic bonds
disulphide bonds

Question 7

quaternary structure proteins

Answer 7

multiple polypeptide chains arrange to make complete 3d protein

Question 8

fibrous proteins

Answer 8

regular
repetitive amino acid chains
insoluble
forms fibre
E.g: collagen, elastin, keratin

Question 9

globular proteins

Answer 9

spherical shape
solubule in water
specific shapes
e.g: hormones

Question 10

collagen

Answer 10

mechanical strength
fibrous
insoluble

Question 11

keratin

Answer 11

strong as many disulphide bonds
impermeable to water so barrier

Question 12

elastin

Answer 12

allows skin to stretch

Question 13

haemoglobin

Answer 13

quaternary protein (2 alpha, 2 beta glucose)
has haem prosthetic group which has iron to attach to o2

Question 14

test for proteins

Answer 14

add buirets to sample
light blue to lilac colour change