Proteins

Question 1

Protein elements

Answer 1

Carbon, hydrogen, oxygen, nitrogen and sometimes sulfur

Question 2

Protein general formula

Answer 2

R-CH(NH2)-COOH

Question 3

Amino acid

Answer 3

Has an amine group(basic) and carboxyl group (acidic)

Question 4

R group

Answer 4

Variable group- 20 types of amino acids

Question 5

Protein

Answer 5

polymer of amino acids

Question 6

Dipeptide

Answer 6

Two amino acids joined together by condensation with a peptide bond

Question 7

Primary structure

Answer 7

Sequence of AAs in a polypeptide chain by peptide bonds

Question 8

Secondary structure

Answer 8

folding of the polypeptide chain into an alpha helix or beta pleated sheet

Question 9

What bonding in alpha helix

Answer 9

Hydrogen bonding between the =O on -CO groups and the -H on -NH

Question 10

Tertiary structure

Answer 10

Folding of the alpha helix to form specific 3D shapes

Question 11

Bonds in tertiary structure

Answer 11

Hydrogen
Ionic
Hydrophobic interactions

Question 12

Enzymes are examples of what structure

Answer 12

Tertiary

Question 13

Quaternary structure

Answer 13

2 or more polypeptide chains joined together

Question 14

Globular proteins

Answer 14

Fold into a ball shape
Hydrophobic R groups in, hydrophilic out

Question 15

Globular proteins functions

Answer 15

Water soluble
Metabolic role- enzymes, hormones, antibodies. eg. haemoglobin carries o2 with 4 tertiary structures

Question 16

Fibrous proteins

Answer 16

long fibres of regular repetitive sequences and cross links

Question 17

Fibrous proteins functions

Answer 17

Insoluble
structural roles, eg. collagen triple helix in tendons, bones, cartilage
ALSO myosin and keratin