Proteins

Question 1

What is the basic monomer unit of a polypeptide?

Answer 1

amino acid

Question 2

Name the four parts of an amino acid.

Answer 2

• amino group
• carboxyl group
• hydrogen atom
• R group

Question 3

What is the bond between two proteins called?

Answer 3

dipeptide

Question 4

What is the primary structure of proteins?

Answer 4

the sequences of amino acids that makes up the polypeptides of a protein

Question 5

What is the secondary structure of a protein?

Answer 5

chain of amino acids of the polypeptides of a protein is folded (a-helix/b-pleated sheet)

Question 6

What is the tertiary structure of a protein?

Answer 6

folding of the whole polypeptide chain, with bonds to maintain it (disulphide bridges, ionic, hydrogen bonds)

Question 7

What is the quarternary structure of a protein?

Answer 7

a number of polypeptide chains linked together, associated with some non-protein groups

Question 8

Test for proteins

Answer 8

Biuret test

Question 9

What colour indicates presence for peptide bonds?

Answer 9

purple