Amino Acids MCQs | Amino Acids Multiple Choice Questions(MCQs) & Answers

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Questions
1 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
2 Which of the following is an essential amino acid?
A Cysteine
B Asparagine
C Glutamine
D Phenylalanine

Answer: Asparagine
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3 Which of the following amino acid is sweet in taste?
A Glycine
B Alanine
C Glutamic acid
D None of these

Answer: Glycine
4 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
5 Carnosine is a dipeptide of histidine and _____.
A β-histidine
B β-alanine
C β-lysine
D α-lysine

Answer: β-alanine
6 Amino acid selenocysteine is coded by_______.
A UAA
B UAG
C UGA
D AUG

Answer: UGA
7 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
8 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
9 Which of the following amino acid is a ‘α-helix terminator’
A tryptophan
B phenyl alnine
C tyrosine
D proline

Answer: proline
10 Which of the following amino acid has buffering capacity
A Tryptophan
B Cysteine
C Histidine
D Arginine

Answer: Histidine
11 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
12 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
13 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
14 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
15 Glycine and proline are the most abundant amino acids in the structure of-
A Hemoglobin
B Myoglobin
C Insulin
D Collagen

Answer: Collagen
16 Some proteins contain additional amino acids that arise by modification of an amino acid already present in a peptide, examples include-
A 4 -hydroxy proline
B 5- hydroxy Lysine
C Gamma Amino Butyric Acid
D All of the above

Answer: All of the above
17 Which out of the following amino acids carries a net positive charge at the physiological p H ?
A Valine
B Leucine
C Isoleucine
D None of the followings

Answer: None of the followings
18 All of the following amino acids are both glucogenic as well as ketogenic except
A Isoleucine
B Leucine
C Tyrosine
D Phenyl alanine

Answer: Leucine
19 The greatest buffering capacity at physiological p H would be provided by a protein rich in which of the following amino acids?
A Serine
B Cysteine
C Alanine
D Histidine

Answer: Histidine
20 Which out of the followings is not a fibrous protein?
A Carbonic anhydrase
B Collagen
C Fibrinogen
D Keratin

Answer: Carbonic anhydrase

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