Proteins

Question 1

Proteins: definition

Answer 1

• large biomolecules/macromolecules consisting of one or more chains of amino acids
• catalyse metabolic reactions, DNA replication, transport molecules, respond to stimuli

Question 2

Classes of proteins

Answer 2

Membrane: in direct physical contact with a membrane; generally water insoluble

Globular: complex folds, irregularly shaped
Fibrous: extended, simple folds - generally structural proteins

Enzymes: accelerate biochemical reactions
Structural: form biological structures
Transport: carry biochemically important substances
Defense: protect body from foreign invaders

Question 3

Protein structure

Answer 3

Primary, secondary, tertiary, quaternary

Amino acid residues> Helix> polypeptide chain> assembles subunits

4 groups:
- non polar
- polar
- negative
- positive