Proteins

Question 1

Define classes of amino acids

Answer 1

Bases-Cytosine, guanine, adenine, thymine, uracil
R-groups- aromatic (hydrocarbon rings), sulphur containing, basic, acidic, polar, miscellaneous

Question 2

Describe the function of proteins

Answer 2

Structure (keratin) , functional (enzymes, immune system)

Question 3

Define primary structure

Answer 3

Amino acids form a polypeptide chain

Question 4

Define secondary structure

Answer 4

3D spatial arrangement of amino acids in a polypeptide chain
Alpha helix or the beta pleated sheet

Question 5

Define teritary structure

Answer 5

R groups interact with each other on the polypeptide chains,

Question 6

Define quaternary structure

Answer 6

Several polypeptide chains interact with each other to form a complex of protein molecules e.g haemaglobin

Question 7

Discuss conjugated proteins

Answer 7

Glycoproteins- contain carbohydrate molecules
Lipoproteins- contain lipids
Metalloproteins- metal ions

Question 8

Describe globular proteins

Answer 8

Used for storage, enzymes, or ones, transporters, structural

Question 9

Describe fibrous proteins

Answer 9

Muscle fibres & connective tissue