Proteins

Question 1

What are the 4 basic categories of amino acids?

Answer 1

Acidic
Basic
Uncharged polar
Non- Polar

Question 2

What amino acids are acidic and basic?

Answer 2

Acidic

• Aspartic acid
• Glutamic Acid

Basic

• Lysine
• Arginine
• Histidine

Question 3

What amino acids are uncharged polar?

Answer 3

Uncharged Poalr

• Asparagine
• Glutamine
• Serine
• Threonine
• Tyrosine

Question 4

What amino acids are Non- Polar?

Answer 4

Non-polar

• Glycine
• Alanine
• Valine
• Leucine
• Isoleucine
• Proline
• Phenylalanine
• Methionine
• Tryptophan
• Cysteine

Question 5

Describe the functions of proteins?

Answer 5

Proteins have a huge range of pf functions within the body.

• Movement
• Protection
• Transport
• Enzymes
• Receptors
• Structural
• Storage
• Hormones
• Control of gene expression

Question 6

Define the term primary structure?

Answer 6

The sequence of amino acids in a polypeptide chain. This is the source of versatility in protein structure.

Question 7

Define the term secondary structure?

Answer 7

The spatial arrangement of amino acid residues that is near each other in the linear sequence.

• Alpha helices, a telephone cord shape held in place by h bonds between the n-h group and the c=o group of the amino acid in the next turn of the helix.
• Beta sheet, the pleated structure is held together by H bonds between the amide groups of linear polypeptide chains.

Question 8

Define the term tertiary structure?

Answer 8

The spatial arrangement of amino acid residues that are far apart in the linear sequence. This depends on:

• Vanderwaals
• Ionic interactions
• Hydrogen bonding
• Disulphide bridges
• Hydrophobic interactions

Question 9

Define the term quaternary structure?

Answer 9

Refers to the spatial arrangement of individual polypeptide chains in a multi-subunit protein.