Before we start the MCQ on Amino Acid, we should know what is Amino Acid? Amino acids are organic compounds that contain amino and carboxyl functional groups, along with a side chain specific to each amino acid. These MCQ on Amino Acid are most important part of Biology and Chemistry of all competitive exam including NEET, AIIMS, JIPMER, RRB, SSC, UPSC, PSC, GATE, B.Sc, M.Sc etc. These are composed from NCERT Book.
MCQ on Amino Acid with Answer PDF download
1. Choose the incorrect statement with respect to Amino Acids.
(A) Only L amino acids are found in the biological system
(B) Glycine is optical inactive
(C) Tyrosine is a modified amino acid
(D) Seleno cysteine is 21 st amino acid
Answer: Tyrosine is a modified amino acid
2. Choose a nano peptide out of the followings-
(A) Oxytocin
(B) Vasopressin
(C) Bradykinin
(D) All of the above
Answer: All of the above
3. Which out of the following amino acids is a precursor for a mediator of allergies and inflammation?
(A) Histidine
(B) Tyrosine
(C) Phenyl Alanine
(D) Tryptophan
Answer: Histidine
4. Mother of a mal nourished child has been instructed to include a complete protein in diet for her child, which out of the followings proteins should be recommended?
(A) Pulses
(B) Wheat
(C) Soy Protein
(D) Milk
Answer: Milk
5. All of the below mentioned amino acids can participate in hydrogen bonding except one
(A) Serine
(B) Cysteine
(C) Threonine
(D) Valine
Answer: Valine
6. Among the 20 standard proteins coding amino acids, which one is least occurs in proteins?
(A) Glycine
(B) Alanine
(C) Tryptophan
(D) Methionine
Answer: Tryptophan
7. Amino acids has
(A) both amino group and carboxyl group
(B) both amino group and keto group
(C) amino group only
(D) carboxyl group only
Answer: both amino group and carboxyl group
8. The simplest amino acid is
(A) Proline
(B) methionine
(C) glycine
(D) serine
Answer: Glycine
9. The first amino acid in a polypeptide chain is
(A) Serine
(B) Valine
(C) Alanine
(D) Methionine
Answer: Methionine
10. Which of the following is an α imino acid
(A) serene
(B) threonine
(C) valine
(D) proline
Answer: proline
11. Aromatic amino acids include
(A) Phenylalanine, tyrosine and tryptophan
(B) Phenylalanine, serine and tryptophan
(C) Threonine, tyrosine and tryptophan
(D) Asparagine, tyrosine and tryptophan
Answer: Phenylalanine, tyrosine and tryptophan
12. Positively charged basic amino acids are
(A) Lysine and arginine
(B) Lysine and asparagine
(C) Glutamine and arginine
(D) Lysine and glutamine
Answer: Lysine and arginine
13. Acidic amino acids include
(A) Arginine and glutamate
(B) Aspartate and asparagine
(C) Aspartate and lysine
(D) Aspartate and glutamate
Answer: Aspartate and glutamate
14. The 21st amino acid is
(A) hydroxy lysine
(B) hydroxyl proline
(C) selenocysteine
(D) citrulline
Answer: selenocysteine
15. A mutation has changed an isoleucine residue of a protein to Glutamic acid, which statement best describes its location in a hydrophilic exterior-
(A) On the surface since it is hydrophilic in nature
(B) In side the core of the protein since it is hydrophobic in nature
(C) Any where inside or outside
(D) Inside the core of protein since it has a polar but uncharged side chain
Answer: On the surface since it is hydrophilic in nature
16. Identify the amino acids containing nonpolar, aliphatic R groups
(A) Phenylalanine, tyrosine, and tryptophan
(B) Glycine, alanine, leucine
(C) Lysine, arginine, histidine
(D) Serine, threonine, cysteine
Answer: Glycine, alanine, leucine
17. Which of the following is an essential amino acid?
(A) Cysteine
(B) Asparagine
(C) Glutamine
(D) Phenylalanine
Answer: Asparagine
18. Which of the following amino acid is sweet in taste?
(A) Glycine
(B) Alanine
(C) Glutamic acid
(D) None of these
Answer: Glycine
19. Which of the following amino acid will be absent in α (alpha) helix structure of protein?
(A) Glycine
(B) Galine
(C) Glutamic acid
(D) Proline
Answer: Proline
20. Carnosine is a dipeptide of histidine and _____.
(A) β-histidine
(B) β-alanine
(C) β-lysine
(D) α-lysine
Answer: β-alanine
21. Amino acid selenocysteine is coded by_______.
(A) UAA
(B) UAG
(C) UGA
(D) AUG
Answer: UGA
22. Bacteria prefer to use the codon CGA instead of AGA to code for Arginine. This is an example for _____.
(A) Second genetic code
(B) Nullomers
(C) Transcriptional decoding
(D) Allomers
Answer: Nullomers
23. Amino acids are
(A) building blocks of carbohydrates
(B) building blocks of nucleic acids
(C) building blocks of lipids
(D) building blocks of proteins
Answer: building blocks of proteins
24. Which of the following amino acid is a ‘α-helix terminator’
(A) tryptophan
(B) phenyl alnine
(C) tyrosine
(D) proline
Answer: proline
25. Which of the following amino acid has buffering capacity
(A) Tryptophan
(B) Cysteine
(C) Histidine
(D) Arginine
Answer: Histidine
26. The naturally occurring form of amino acid in proteins
(A) L-amino acids only
(B) D-amino acids only
(C) both L and D amino acids
(D) none of these
Answer: L-amino acids only
27. Sulphur containing amino acids are
(A) Cysteine and methionine
(B) Methionine and threonine
(C) Cysteine and threonine
(D) Cysteine and serine
Answer: Cysteine and methionine
28. Amino acids with hydroxyl groups are
(A) Serine And Alanine
(B) Alanine And Valine
(C) Serine And Threonine
(D) Valine And Isoleucine
Answer: Serine And Threonine
29. Absorbance at 280nm exhibited by protein is due to
(A) Aliphatic Amino Acids
(B) All Amino Acids
(C) Non-Polar Amino Acids
(D) Aromatic Amino Acids
Answer: Aromatic Amino Acids
30. Glycine and proline are the most abundant amino acids in the structure of-
(A) Hemoglobin
(B) Myoglobin
(C) Insulin
(D) Collagen
Answer: Collagen
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