Amino Acids and Proteins Quiz | Amino Acids and Proteins Multiple Choice Questions(MCQs) & Answers

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Questions
1 How many amino acid residues are there in per turn of α-helix?
A 3.6
B 4.6
C 3.0
D 2.5

Answer: 3.6
2 How is the secondary structure of a protein stabilized?
A Van der wall forces
B Hydrogen bonding
C Covalent bond
D Hydrophobic bond

Answer: Hydrogen bonding
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3 What is the maximum wavelength that Tryptophan and tyrosine absorb?
A 280nm
B 260nm
C 257nm
D 230nm

Answer: 280nm
4 In which amino acid Imidazole group, an aromatic ring found?
A Lysine
B Arginine
C Histidine
D Glutamate

Answer: Histidine
5 Which of these are rare amino acid in a protein?
A Leucine and serine
B Lysine and glutamic acid
C Tryptophan and methionine
D Leucine and lysine

Answer: Tryptophan and methionine
6 Name the amino acid, which exists in two non-superimposable mirror images of each other.
A Epimer
B Anomer
C Enantiomer
D Chiral carbon

Answer: Enantiomer
7 A solution of L-alanine (4.0g/50 ml of 6 N HCl) has a rotation of +1.61° in a 2dm polarimeter tube. Calculate the specific rotation of L-alanine in 6 N HCl.
A +15.1°
B +10.1°
C +11.1°
D +16.1°

Answer: +10.1°
8 Which of these are used to measure optical activity?
A Polarimeter
B Planometer
C Psychrometer
D Photometer

Answer: Polarimeter
9 Which of these amino acids are not optically active?
A Cysteine
B Lysine
C Arginine
D Glycine

Answer: Glycine
10 The general structure of all amino acids are same except for ___________
A Lysine
B Glycine
C Proline
D Alanine

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

Answer: Glycine
12 Which of the following amino acid act as inhibitory neurotransmitter?
A Glycine
B Alanine
C GABA
D All of these

Answer: All of these
13 The amino acid commonly used as an ingredient in the buffers of SDS PAGE.
A Aspartic acid
B Glutamic acid
C Glycine
D Aspartic acid and Lysine together

Answer: Glycine
14 Which of the following amino acid will be absent in α (alpha) helix structure of protein?
A Proline
B Glycine
C Galine
D Glutamic acid

Answer: Proline
15 Aminolevulinic acid, the first product in porphyrin biosynthesis in eukaryotes, is synthesized from ____ and succinyl-CoA.
A Valine
B Tryptophan
C Methionine
D Glycine

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

Answer: β-alanine
17 Which of the following enzyme contain Selenocysteine?
A Nitrate reductase
B Catalase
C Glutathione peroxidase
D All of these

Answer: Glutathione peroxidase
18 Amino acid used in the ‘stripping’ of Western blotting experiment is:
A Glycine
B Alanine
C Glutamic acid
D Phenyl alanine

Answer: Glycine
19 Amino acid selenocysteine is coded by_______.
A UAA
B UAG
C UGA
D AUG

Answer: UGA
20 Which of the following is a glucogenic amino acid?
A Glycine
B Proline
C Alanine
D All of these

Answer: All of these

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