Proteins

Question 1

What is the R group on glycine?

Answer 1

H

Question 2

What is the R group on alanine?

Answer 2

CH3

Question 3

What is a peptide bond?

Answer 3

Covalent bond formed between the amino group of one amino acid and the carboxyl group of another, involving the elimination of a H20 molecule.

Question 4

At what part of a cell should a peptide bond form?

Answer 4

At the ribosomes

Question 5

What is the primary structure of a protein?

Answer 5

Sequence of amino acids in the polypeptide chain

Question 6

What is the secondary structure of a protein?

Answer 6

The bending/ folding of the primary structure into an alpha helix or beta pleated sheet.
Also defined as the spatial arrangement of amino acid residues which are near each other on the linear chain

Question 7

What is the tertiary structure of a protein?

Answer 7

The spatial arrangement of amino acid residues which are far apart on the linear chain.
Held in place by hydrogen bonds, disulphide bridges, ionic interactions, hydrophobic interactions and Van der Waal forces.

Question 8

What is the quaternary structure of a protein?

Answer 8

This is the spatial arrangement of individual polypeptide chains in a multi sub unit protein.

Question 9

Which structure of a protein will not be affected by denaturation?

Answer 9

Primary- due to strong peptide bonds

Question 10

What is the difference between fibrous and globular proteins?

Answer 10

Globular proteins are water soluble and have their function in metabolic reactions.
Fibrous proteins are non water soluble and have their function in structure and support.

Question 11

Where do glycoproteins form?

Answer 11

ER and Golgi Apparatus

Question 12

What are the roles of glycoproteins?

Answer 12

Protein stabilisation
Protein orientation
Signalling
Cell recognition
Affect solubility

Question 13

What is the function of lipoproteins?

Answer 13

The transport of water insoluble fats and cholesterol in the blood