Protein

Question 1

Protein Composition

Answer 1

C=Carbon H=Hydrogen O=Oxygen N=Nitrogen

Question 2

Diagram of a basic amino acid

Answer 2

H
NH2 C COOH
R

Question 3

Diagram of Glycine

Answer 3

H
NH2 C COOH
H

Question 4

Essential amino acids

Answer 4

Valine
Lysine
Methionine

Question 5

Non Essential amino acids

Answer 5

Alanine
Cysteine
Glycine

Question 6

Diagram of a peptide link

Answer 6

H O= H
NH2 - C - C - N - C - COOH
R H R

Question 7

Description of a peptide link

Answer 7

When two amino acids join together, hydrolysis is a water molecule added during digestion which causes the reverse to occur

Question 8

What are essential amino acids

Answer 8

Amino acids the body cannot produce so we must ingest them

Question 9

Primary protein structure

Answer 9

[insert diagram of straight primary protein structure]

Order of amino acids in protein chains

Question 10

Secondary protein structure

Answer 10

[insert diagram of curvy secondary protein structure]

Involves folding of a polypeptide chain or cross linking with another polypeptide chain

Two main cross links

• disulphide bonds
• hydrogen bonds

Question 11

Tertiary protein structure

Answer 11

[insert diagram of zig zag tertiary protein structure]

Involves folding of the secondary structure of protein into three-dimensional shapes

Question 12

Classifications of proteins

Answer 12

Simple
- Animal
> fibrous
> globular

• Plant
  > Glutenins
  > Protamines

Conjugated

• lipoprotein
• phosphoprotein

Question 13

Properties of proteins

Answer 13

Solubility 
Elasticity 
Denaturation
Maillard Reaction
Gel Formation
Foam Formation

Question 14

Complementary/Supplementary Roles

Answer 14

Eating more than one food lacking EAA, complimenting and providing all amino acids

Question 15

Digestion of proteins

Answer 15

Stomach > Gastric Juice > Pepsin > Proteins > Peptones

Pancreas > Pancreas juice > Trypsin

Small intestine > Intestinal juice > Peptidase > Peptides > Amino Acids