Molecular Biology and Genetics MCQ Questions & Answers

71

Caspases are involved in the process of

A) DNA replication B) Mutation and recombination C) Antibody synthesis D) Apoptosis

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

72

Which of the following statements are true with respect to a special complex called 'dicer'?
P. It consists of deoxyribonuclease and DNA fragments.
Q. It consists of ribonuclease and RNA fragments.
R. It is involved in gene silencing.
S. It triggers apoptosis.

A) P, R B) Q, R C) P, S D) Q, S

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

73

During transcription,

A) DNA gyrase introduces negative supercoils and DNA topoisomerase I removes negative supercoils B) DNA topoisomerase I introduces negative supercoils and DNA gyrase removes negative supercoils C) Both DNA gyrase and DNA topoisomearse I introduce negative supercoils D) Both DNA gyrase and DNA topoisomearse I remove negative supercoils

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

74

What will be the binding status of regulatory proteins in lac operon when concentrations of both lactose and glucose are very low in the culture medium?

A) Only the repressor remains bound to the operator B) Only the cyclic AMP-Catabolic Activator Protein (cAMP-CAP) complex remains bound to the CAP binding site C) Neither the repressor nor cAMP-CAP complex remain bound to their respective binding sites D) Both the repressor and cAMP-CAP complex remain bound to their respective binding sites

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

75

The 5' ends of the mature forms of the prokaryotic mRNAs and tRNAs are

A) A triphosphate group in mRNAs and a monophosphate group in tRNAs B) Triphosphate groups in both mRNAs and tRNAs C) Monophosphate groups in both mRNAs and tRNAs D) A monophosphate group in mRNAs and a triphosphate group in tRNAs

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

76

Nuclease-hypersensitive sites in the chromosomes are sites that appear to be

A) H2 and H4 histone free B) H1 and H2 histone free C) H3 and H4 histone free D) Nucleosome free

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

77

How many different protein sequences of 100 residues can be generated using 20 standard amino acids?

A) 100²⁰ B) 100 × 20 C) 20¹⁰⁰ D) 100! × 20!

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

78

The G + C content of bacteriophage M13 double stranded DNA is 68%. What would you expect the G + C content of its mRNA?

A) About 68% B) About 34% C) About 32% D) About 86%

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

79

Efficient expression of a heterologous protein product is influenced by

A) Transcriptional efficiency B) Copy number of the plasmid C) Codon bias D) All of the above

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

80

The 4-amino or 4-keto group of pyrimidine bases is located in the

A) Major groove of the double stranded DNA B) Minor groove of the double stranded DNA C) Minor groove of the B form DNA but not the A form DNA D) Major groove of the B form DNA but not the A form DNA

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Molecular Biology and Genetics MCQ Questions & Answers | Biotechnology