MCQs on Protein Chemistry. (Biochemistry)

MCQs on Protein Chemistry. (Biochemistry)

1. MCQs on Protein Chemistry
1. Which element is uniquely present in proteins compared to carbohydrates and
lipids?
a) Hydrogen
b) Nitrogen
c) Carbon
d) Oxygen
Answer: b) Nitrogen
2. Which type of bond is formed between amino acids in a protein?
a) Hydrogen bond
b) Peptide bond
c) Glycosidic bond
d) Ionic bond
Answer: b) Peptide bond
3. Which amino acid does not have a chiral carbon?
a) Alanine
b) Glycine
c) Valine
d) Serine
Answer: b) Glycine
4. Which structure of protein refers to the linear sequence of amino acids?
a) Primary structure
b) Secondary structure
c) Tertiary structure
d) Quaternary structure
Answer: a) Primary structure
5. What stabilizes the secondary structure of proteins?
a) Covalent bonds
b) Disulfide bonds
c) Hydrogen bonds
d) Ionic bonds
Answer: c) Hydrogen bonds
6. Which of the following is a fibrous protein?
a) Hemoglobin
b) Collagen
c) Myoglobin
d) Insulin
Answer: b) Collagen
7. What is the role of chaperone proteins?
a) Protein degradation
b) Protein folding
c) Protein synthesis

2. d) Protein transport
Answer: b) Protein folding
8. Which of the following amino acids contains a sulfur atom?
a) Alanine
b) Methionine
c) Leucine
d) Proline
Answer: b) Methionine
9. The test used to detect the presence of peptide bonds in proteins is:
a) Molisch test
b) Biuret test
c) Ninhydrin test
d) Xanthoproteic test
Answer: b) Biuret test
10. Which amino acid is the precursor for the synthesis of serotonin?
a) Tryptophan
b) Tyrosine
c) Arginine
d) Phenylalanine
Answer: a) Tryptophan
11. What is the term for the pH at which a protein has no net charge?
a) Acidic pH
b) Basic pH
c) Isoelectric point
d) Neutral pH
Answer: c) Isoelectric point
12. Which of the following is a conjugated protein?
a) Albumin
b) Hemoglobin
c) Keratin
d) Myosin
Answer: b) Hemoglobin
13. What type of protein is an enzyme?
a) Structural protein
b) Regulatory protein
c) Globular protein
d) Transport protein
Answer: c) Globular protein
14. Which amino acid can form disulfide bonds in proteins?
a) Proline
b) Tyrosine
c) Cysteine

3. d) Histidine
Answer: c) Cysteine
15. Which protein is the primary structural component of hair and nails?
a) Collagen
b) Elastin
c) Keratin
d) Myosin
Answer: c) Keratin
16. What is the primary function of hemoglobin?
a) Enzyme activity
b) Transport of oxygen
c) Immune response
d) Hormonal regulation
Answer: b) Transport of oxygen
17. Which of the following amino acids is essential in the human diet?
a) Glycine
b) Tyrosine
c) Lysine
d) Glutamine
Answer: c) Lysine
18. Which test is used to identify aromatic amino acids?
a) Ninhydrin test
b) Xanthoproteic test
c) Biuret test
d) Millon's test
Answer: b) Xanthoproteic test
19. What is the characteristic of a zwitterion?
a) It has a positive charge.
b) It has a negative charge.
c) It has both positive and negative charges.
d) It has no charge.
Answer: c) It has both positive and negative charges.
20. Which protein structure is disrupted during denaturation?
a) Primary structure
b) Secondary structure
c) Tertiary structure
d) Both b and c
Answer: d) Both b and c