Protein structure

Question 1

what is the primary structure

Answer 1

The sequence of amino acids

Question 2

what is the secondary structure

Answer 2

The folding or coiling of an amino acid chain, due to hydrogen bonding.
Forms a a-helix or a B-pleated sheet

Question 3

what is the tertiary structure

Answer 3

3D shape of the molecule, has a very precise shape

Question 4

what is the quaternary structure

Answer 4

when a protein consists of more than one polypeptide chain

Question 5

What part of a cell determines the primary structure

Answer 5

DNA, nucleus

Question 6

Describe the alpha helix

Answer 6

held by H bonds
Amino acids per 10 turns of the helix

Question 7

describe the b-pleated sheet

Answer 7

chains fold slightly in a zig zag structure

Question 8

In the a-helix and b-pleated sheet, what parts of the amino acid do the hydrogen bonds bind to

Answer 8

The hydrogen bonds are between the amine group (-NH2) and the carboxyl group (-COOH) of another amino acid

Question 9

What bonds are involved in the primary structure

Answer 9

Only peptide bonds

Question 10

What bonds are used in the secondary structure

Answer 10

Peptide
Hydrogen

Question 11

What bonds are used in the tertiary structure

Answer 11

Peptide
Disulphide
hydrogen
ionic
hydrophobic interactions

Question 12

How does hydrophobic interactions make the amino acid spiral

Answer 12

The hydrophobic R groups associate with the centre of the polypeptide chain to avoid water exposure.
Hydrophilic parts of the amino acid are found at the edge of the polypeptide

Interactions of both cause amino acid chain to spiral