Protein

Question 1

How many amino acids exist

Answer 1

20

Question 2

What is a polypeptide

Answer 2

A recurring pattern of amino acids

Question 3

What is the primary structure of proteins

Answer 3

The sequence of amino acids in a polypeptide chain

Question 4

What is the secondary structure of a protein

Answer 4

Hydrogen bonding of the peptide backbones causes the amino acids to fold into a repeating pattern

Question 5

What is the tertiary structure of a protein

Answer 5

Three dimensional folding pattern of a protein due to side to side chain interactions

Question 6

What is the quaternary structure in proteins

Answer 6

Protein consisting of more than one amino acid chain

Question 7

What are globular proteins

Answer 7

Proteins with biochemical functions

Soluble

Examples include enzymes and myoglobin in the muscles

Question 8

What are fibrous proteins

Answer 8

Structural proteins

Insoluble

Examples include keratin in hair and collagen in skin

Question 9

What is a bond between two proteins called

Answer 9

A peptide bond

Question 10

What is the test for proteins called

Answer 10

Biuret test is used for the presence of a protein using biuret solution.it is added to the sample and if the solution changes from a blue to a lilac/purple then protein is present

Question 11

structure of protein

Answer 11

1. Polymer of amino acids;
2. Joined by peptide bonds;
3. Formed by condensation;
4. Primary structure is order of amino acids;
5. Secondary structure is folding of polypeptide chain due to hydrogen
   bonding;
   Accept alpha helix / pleated sheet
6. Tertiary structure is 3-D folding due to hydrogen bonding and ionic /
   disulfide bonds;
7. Quaternary structure is two or more polypeptide chains.