Amino Acids

Question 1

What are proteins

Answer 1

Bio polymers composed of amino acid monomers linked by peptide bonds

Question 2

Amino acids classifications

Answer 2

Non-polar neutral have hydrophobic R group

Polar neutral have hydrophilic but neutral R groups

Polar acidic have hydrophilic acid R groups ie R groups contains COOH

Polar basic have R groups with basic N group

Question 3

The secondary, tertiary and quaternary structures of proteins are due to …

Answer 3

interaction between the amino acid side chain residues (-R groups) and the backbone polypeptide chain.

Question 4

The interactions between –CONH- groups of the peptide chain are responsible for

Answer 4

a-helix conformation and b-pleated sheet conformations in peptides. (secondary structures)

Question 5

Further interactions between side chain residues are responsible for

Answer 5

tertiary and quaternary structures of proteins.

Question 6

A-helix elements

Answer 6

Resembles right handed coiled spring

Each peptide bond forms 2 H bonds

Question 7

B-sheet elements

Answer 7

Almost completely extended poly chain
Backbone forms zigzag
Side chains project above and below sheet structure
B-strands May be aligned parallel or anti-parallel to form b-sheets

Question 8

What is tertiary and quaternary structure maintained by

Answer 8

Side chains of amino acids