Protein Synthesis Questions and Answers pdf | MCQ on Protein Structure | Amino Acid MCQ with Answers pdf
1. Which of the following amino acids has an imino R-group?
(a) Cysteine
(b) Glycine
(c) Alanine
(d) Proline
Ans. d
2. Out of the following amino acid, which one contains sulphur containing R-group?
(a) Leucine
(b) Tyrosine
(c) Cysteine
(d) Serine
Ans. c
3. The simplest amino acid with hydrogen atom as an R-group is
(a) serine
(b) tryptophan
(c) glycine
(d) valine
Ans. c
4. An amino acid with imidazole group is
(a) histidine
(b) proline
(c) tyrosine
(d) lysine
Ans. a
5. An amino acid with guanidine group is
(a) arginine
(b) cysteine
(c) leucine
(d) valine
Ans. a
6. Which of the following statements is false?
(a) Amino acids have N-terminus, C-terminus and R-groups
(b) Amino acids are most soluble in water at their isoelectric point
(c) The net charge on an amino acid is a function of the pH of the solution
(d) Proline has an amino R-group
Ans. b
8. Which bond in the proteins has a partial double bond character?
(a) C-N
(b) C.-N
(c) C-O
(d) Ca-C
Ans. a
9. Which of the following is/are correct?
I. Peptide bond is non planar.
II. Peptide bond has partial double bond character.
(a) Only II
(b) Only I
(c) Both I and II
(d) Neither I nor II
Ans. b
10. The high solubility of amino acids in water is due to
(a) hydrophilic nature of the amino group
(b) unipolarity
(c) the presence of side chain
(d) bipolar ion structure
Ans. d
Protein Questions and Answers PDF
11. a-carbon of amino acids is chiral, except
(a) leucine
(b) arginine
(c) glycine
(d) valine
Ans. c
12. In the groups of amino acids indicated below, which one has side chain containing hydroxylic groups?
(a) Serine, threonine, tyrosine
(b) Leucine, valine
(C) Cysteine, methionine
(d) Glutarnine, tyrosine, serine
Ans. a
13. Which of the following is not true about alanine?
(a) Contains a branched side chain
(b) At pH 1, it will move towards the cathode
(c) At pH 1, the overall charge is +1
(d) At equimolar mixture of D and L, alanine does not rotate the plane polarised light
Ans. a
14. In an a-helix, hydrogen bonds are
(a) between polar amino acids and water
(b) between chains that run side by side
(c) within a single chain
(d) only between amino acids of opposite charge
Ans. c
15. Which one of the following amino acids is the uncharged derivative of an acidic amino acid?
(a) Cysteine
(b) Tyrosine
(c) Glutamine
(d) Serine
Ans. c
16. Which one of the following amino acids is most compatible with an a-helical structure?
(a) Tryptophan
(b) Alanine
(c) Leucine
(d) Proline
Ans. b
17. The greatest buffering capacity at physiological pH would be provided which of the following amino acid?
(a) Serine
(b) Cysteine
(c) Alanine
(d) Histidine
Ans. d
18. In which one of the following amino acid myoglobin is likely to be localised highly within the interior of the molecule?
(a) Arginine
(b) Valine
(c) Aspartic acid
(d) Lysine
Ans. b
19. Glycine is
(a) optically inactive
(b) hydrophilic, basic and charged
(c) hydrophobic
(d) hydrophilic, acidic and charged
Ans. a
20. The amino acid found to be limiting in pulses,
(a) Leucine
(b) Lysine
(c) Methionine
(d) Glutamine
Ans. c
MCQs on Protein Structure and Function pdf |Amino Acids Peptides and Proteins
21. All of the mentioned amino acids can participale hydrogen bonding except
(a) serine
(b) cysteine
(c) threonine
(d) valine
Ans. d
22. Glycine and proline are the most abundant amino acide the structure of
(a) haemoglobin
(b) myoglobin
(c) insulin
(d) collagen
Ans. d
23. Which one of the following amino acid may be considered S-hydrophobic amino acid at the physiological pH 7.4?
(a) Isoleucine
(b) Arginine
(c) Aspartic acid
(d) Threonine
Ans. a
24. The highest concentration of cystine can be found in
(a) melanin
(b) keratin
(c) collagen
(d) myosin
Ans. b
25. Which of the following are rare amino acids to be found protein?
(a) Tryptophan and methionine
(b) Lysine
(c) Serine and leucine
(d) Glutamic acid and leucine
Ans. a
26. Richest source of protein is
(a) wheat
(b) sago
(c) soybean
(d) rice
Ans. c
27. Which out of these is protein occurs in nature?
(a) Polyethylene
(b) Cellulose
(c) Terylene
(d) Silk and wool
Ans. d
28. Which amino acid is not optically active?
(a) Glycine
(b) Leucine
(c) Isoleucine
(d) Valine
Ans. a
29. Protein present in wheat grain is
(a) glutenin
(b) albumin
(c) zymase
(d) glycogen
Ans. a
30. Amino acid present in histones are
(a) arginine and histidine
(b) arginine and lysine
(c) lysine and histidine
(d) arginine and cytosine
Ans. b
