Revision for week 9 bio122

Which of the following bond(s) do(es) NOT exist in a secondary structure?

• Peptide bond

• Hydrogen bond

• Disulphide bond

• Ionic bond

The difference between tertiary and quartenary structure is:

• Tertiary structure has double bond whereas quartenary structure does not have double bond

• Tertiary structure consists of one polypeptide chain whereas quartenary structure consists of more than one polypeptide chains

• Tertiary structure is fibrous whereas quartenary structure is globular

• Tertiary structure is water-soluble whereas quartenary structure is lipid soluble

The repeating units of protein are

• Amino acids

• Glucose

• Fatty acid

• Peptides

Haemoglobin is a quartenary protein because;

• It has more than one peptide bonds

• Its shape is globular

• It consists of more than one polypeptide chains

• It has iron in each heme group

What is the monomer of a protein?

• amino acid
• monosaccharide
• fatty acid
• nucleic acid

Which of the following describes the secondary structure of proteins?

• The sequence of amino acids

• The α-helix and β-pleated sheet folding

• The folding of the polypeptide chain due to the 'R' groups

• The joining of different protein molecules to make one big molecule

What are essential amino acids?

• The amino acids which can synthesis by our body and don’t need to obtain from diet.

• The amino acids which cannot synthesis by our body and need to obtain from diet.

How does denaturation affect the function of protein?

• Cause proteins to breakdown

• Cause proteins to deactivate

• Cause proteins to grow rapidly

• Cause proteins to unfold and lose its functional shape

The unique characteristic of each amino acid is determined by

• Its R group.

• Its amino group

• The type of peptide bond.

• Its position on the polypeptide chain

The primary structure of protein represents

• Helical structure of protein.

• Folded structure of protein

• 3-dimensional structure of protein.

• Linear sequence of polypeptide joined by peptide bonds.