Proteins

Question 1

Protein function

Answer 1

Structural component (muscle)
Enzymes
Antibodies
Hormones 
In membranes (carries)

Question 2

Disulfide links

Answer 2

R groups of cysteine contains sulfur

Strong covalent bonds between 2 sulfur

Question 3

Hydrophobic /hydrophilic interactions

Answer 3

Hydrophobic parts of R group associate in centre of chain to avoid water
Hydrophilic on outside causes twisting of chain so changes shape—important because most proteins in water

Question 4

Amino acids contain…(elements)

Answer 4

Carbon
Hydrogen
Oxygen
Nitrogen

Question 5

Amino group

Answer 5

-NH₂

Question 6

Primary structure
Secondary structure
Tertiary structure
Quaternary structure

Answer 6

Sequence of amino acids

Coiling/folding of amino acid chain (H bonds)

3D shape

More than 1 polypeptide chain

Question 7

In an α-helix, hydrogen bonds are between…

Answer 7

-NH group and -CO group

3 places in between

Question 8

β-pleated sheet

Answer 8

Chain folds over itself
Bond between -NH and
-CO

Question 9

Fibrous protein examples

Answer 9

Keratin
Elastin
Collagen

Question 10

Keratin is strong/hard because…

Answer 10

Disulfide bridges

Question 11

Elastin in vessels to…

Answer 11

Maintain blood pressure

Stretch and recoil

Question 12

Collagen in vessel walls to…

Answer 12

Prevent arteries bursting and withstand pressure

Question 13

Globular proteins have a _________ role and a ________ ____

Answer 13

Metabolic

Specific shape

Question 14

Globular protein examples

Answer 14

Pepsin
Insulin
Haemoglobin