Amino Acids and Proteins Objective Type Questions & Answers

Questions

21 Number of chiral centers in isoleucine is

A 1

B 2

C 3

D 4

View Answer

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

View Answer

Answer: Ketogenic

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23 Which among the following is both glucogenic and ketogenic?

A Isoleucine

B Leucine

C Lysine

D Histidine

View Answer

Answer: Isoleucine

24 Which of the following is an imino acid?

A Alanine

B Glycine

C Proline

D Serine

View Answer

Answer: Proline

25 Which of the following is an essential amino acid?

A Cysteine

B Asparagine

C Glutamine

D Phenylalanine

View Answer

Answer: Phenylalanine

26 Which among the following is a non-essential amino acid?

A Serine

B Threonine

C Lysine

D Histidine

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: 75 g•mol−1

33 Which of the following is not an essential amino acid?

A Proline

B Histidine

C Leucine

D Methionine

View Answer

Answer: Proline

34 Histones are rich in__________.

A Lysine

B Arginine

C Histidine

D Lysine and Arginine

View Answer

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

View Answer

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

View Answer

Answer: Nullomers

37 Which amino acid act as the precursor of nucleotide biosynthesis?

A Aspartate

B Glycine

C Glutamine

D All of these

View Answer

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

View Answer

Answer: All of these

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