Amino Acids and Proteins Quiz | Amino Acids and Proteins Objective Type Questions & Answers

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Questions
21 Number of chiral centers in isoleucine is
A 1
B 2
C 3
D 4

Answer: 2
22 An amino acid that yields acetoacetyl CoA during the catabolism of its carbon skeleton will be considered
A Glycogenic
B Ketogenic
C Both glycogenic and ketogenic
D Essential

Answer: Ketogenic
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23 Which among the following is both glucogenic and ketogenic?
A Isoleucine
B Leucine
C Lysine
D Histidine

Answer: Isoleucine
24 Which of the following is an imino acid?
A Alanine
B Glycine
C Proline
D Serine

Answer: Proline
25 Which of the following is an essential amino acid?
A Cysteine
B Asparagine
C Glutamine
D Phenylalanine

Answer: Phenylalanine
26 Which among the following is a non-essential amino acid?
A Serine
B Threonine
C Lysine
D Histidine

Answer: Serine
27 Which of the following is a true statement?
A Tryptophan and tyrosine are significantly more polar than phenylalanine
B Leucine is commonly used as an ingredient in the buffers of SDS page
C Aspartate is an essential amino acid
D Lysine is a non-essential amino acid

Answer: Tryptophan and tyrosine are significantly more polar than phenylalanine
28 If pK1 = 2.34 and pK2 = 9.60, then the isoelectric point pI is
A 5.87
B 5.97
C 3.67
D 11.94

Answer: 5.97
29 The two amino acids having R groups with a negative net charge at pH 7.0 are
A Aspartate and glutamate
B Arginine and histidine
C Cysteine and methionine
D Proline and valine

Answer: Aspartate and glutamate
30 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
31 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
32 What is the molecular weight of Glycine?
A 75 g•mol−1
B 80 g•mol−1
C 90 g•mol−1
D 95 g•mol−1

Answer: 75 g•mol−1
33 Which of the following is not an essential amino acid?
A Proline
B Histidine
C Leucine
D Methionine

Answer: Proline
34 Histones are rich in__________.
A Lysine
B Arginine
C Histidine
D Lysine and Arginine

Answer: Lysine and Arginine
35 Which of the following is an example for a bio-plastic?
A Polyaspartate
B Polyglutamate
C Poly-L-lysine
D All of these

Answer: Polyaspartate
36 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
37 Which amino acid act as the precursor of nucleotide biosynthesis?
A Aspartate
B Glycine
C Glutamine
D All of these

Answer: All of these
38 Which of the following amino acid act as excitatory neurotransmitter?
A Glutamate
B Aspartate
C Cysteine
D All of these

Answer: All of these

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