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Biotechnology Engineering

Molecular Biology And Genetics MCQs

Practice Molecular Biology And Genetics MCQs for competitive exams.

Molecular Biology And Genetics MCQs

Practice questions from this topic.

Some of the genes from viruses introduced into plants in fully functional form often exhibit Mendelian inheritance because

  1. A. The genes are stably integrated in chromosomes
  2. B. The genes are stably maintained in vectors
  3. C. The genes are co-expressed with chromosomal genes
  4. D. The genes are not interrupted by introns
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Which one of the following modifications is common to both protein and DNA?

  1. A. SUMOylation
  2. B. Nitrosylation
  3. C. Methylation
  4. D. Ubiquitination
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The 4-amino or 4-keto group of pyrimidine bases is located in the

  1. A. Major groove of the double stranded DNA
  2. B. Minor groove of the double stranded DNA
  3. C. Minor groove of the B form DNA but not the A form DNA
  4. D. Major groove of the B form DNA but not the A form DNA
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Efficient expression of a heterologous protein product is influenced by

  1. A. Transcriptional efficiency
  2. B. Copy number of the plasmid
  3. C. Codon bias
  4. D. All of the above
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The G + C content of bacteriophage M13 double stranded DNA is 68%. What would you expect the G + C content of its mRNA?

  1. A. About 68%
  2. B. About 34%
  3. C. About 32%
  4. D. About 86%
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How many different protein sequences of 100 residues can be generated using 20 standard amino acids?

  1. A. 100 20
  2. B. 100 × 20
  3. C. 20 100
  4. D. 100! × 20!
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Nuclease-hypersensitive sites in the chromosomes are sites that appear to be

  1. A. H2 and H4 histone free
  2. B. H1 and H2 histone free
  3. C. H3 and H4 histone free
  4. D. Nucleosome free
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The 5' ends of the mature forms of the prokaryotic mRNAs and tRNAs are

  1. A. A triphosphate group in mRNAs and a monophosphate group in tRNAs
  2. B. Triphosphate groups in both mRNAs and tRNAs
  3. C. Monophosphate groups in both mRNAs and tRNAs
  4. D. A monophosphate group in mRNAs and a triphosphate group in tRNAs
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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?

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

  1. A. DNA gyrase introduces negative supercoils and DNA topoisomerase I removes negative supercoils
  2. B. DNA topoisomerase I introduces negative supercoils and DNA gyrase removes negative supercoils
  3. C. Both DNA gyrase and DNA topoisomearse I introduce negative supercoils
  4. D. Both DNA gyrase and DNA topoisomearse I remove negative supercoils
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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.

  1. A. P, R
  2. B. Q, R
  3. C. P, S
  4. D. Q, S
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Caspases are involved in the process of

  1. A. DNA replication
  2. B. Mutation and recombination
  3. C. Antibody synthesis
  4. D. Apoptosis
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