Discussion
Home ‣ Microbiology ‣ DNA Sequencing, Mutation and Repair Comments
- Question
A mutagen is defined as
Options- A. an enzyme that repairs mutations
- B. a chemical or physical agent that induces mutations
- C. an inhibitor of gene modification
- D. a molecule which stabilizes DNA thus prevents mutations from occurring
- Correct Answer
- a chemical or physical agent that induces mutations
- 1. Which of the following(s) is/are steps in excision repair mechanisms?
Options- A. Excision
- B. Incision
- C. Ligation
- D. All of these Discuss
- 2. A nonsense mutation introduced into the DNA sequence of a gene may
Options- A. cause premature termination of the mRNA
- B. shorten the length of the protein encoded by the gene
- C. have no effect on the transcript or protein made
- D. cause a shift in reading frame Discuss
- 3. The whole-genome shotgun sequencing approach depends primarily on
Options- A. rapidly sequencing thousands of small randomly cloned fragments
- B. methodical sequencing a few large cloned fragments of DNA
- C. sequencing the bacterial chromosome while it is still intact
- D. all of the above Discuss
- 4. Changes in which of the following characterizes mutations?
Options- A. Phenotype
- B. Genotype
- C. Both (a) and (b)
- D. None of these Discuss
- 5. Which of these mechanisms for thymine dimers repair lead to mutations?
Options- A. Excision repair
- B. Photoreactivation
- C. SOS repair
- D. Never leads to mutation Discuss
- 6. Which of the following mutation affects only a single nucleotide?
Options- A. Aerial mutation
- B. Site mutation
- C. Point mutation
- D. Regional mutation Discuss
- 7. When mutations involve vital functions so that the mutants are nonviable, it is a
Options- A. nonsense mutation
- B. lethal mutation
- C. transversion
- D. none of these Discuss
- 8. The cloning step in PCR/sequencing analysis of microbial communities is necessary for
Options- A. the amplification process
- B. preventing contamination by outside DNA
- C. separating the different rRNA gene sequences in the mixture
- D. none of these Discuss
- 9. The original enzyme(s) used in PCR reaction is/are known as
Options- A. E. coli DNA polymerase
- B. E. coli RNA polymerase
- C. Taq polymerase
- D. all of these Discuss
- 10. The template for PCR is
Options- A. RNA
- B. single stranded DNA
- C. double stranded DNA
- D. none of these Discuss
DNA Sequencing, Mutation and Repair problems
Search Results
Correct Answer: All of these
Correct Answer: shorten the length of the protein encoded by the gene
Correct Answer: rapidly sequencing thousands of small randomly cloned fragments
Correct Answer: Both (a) and (b)
Correct Answer: SOS repair
Correct Answer: Point mutation
Correct Answer: lethal mutation
Correct Answer: separating the different rRNA gene sequences in the mixture
Correct Answer: E. coli DNA polymerase
Correct Answer: double stranded DNA
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