Discussion
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- Question
Which of the following enzymes unwind short stretches of DNA helix immediately ahead of a replication fork?
Options- A. DNA polymerases
- B. Helicases
- C. Single-stranded binding proteins
- D. Topoisomerases
- Correct Answer
- Helicases
- 1. Proofreading activity to maintain the fidelity of DNA synthesis
Options- A. occurs after the synthesis has been completed
- B. is a function of the 3'-5' exonuclease activity of the DNA polymerases
- C. requires the presence of an enzyme separate from the DNA polymerases
- D. occurs in prokaryotes but not eukaryotes Discuss
- 2. Which type of genomics studies the transcripts and proteins expressed by a genome?
Options- A. Comparative genomics
- B. Structural genomics
- C. Proteo genomics
- D. Functional genomics Discuss
- 3. Which of the following theory is supported by the genomic sequence of the obligate intracellular parasite Rickettsia prowazekii?
Options- A. Parasitic bacteria have very large genomes
- B. Parasites have a definite genomic sequence similar to viruses
- C. Mitochondria have evolved from endosymbiotic bacteria
- D. All bacteria evolved from viruses Discuss
- 4. What is the range of minimum set of genes required for life?
Options- A. 50-100 genes
- B. 250-350 genes
- C. 1000-1500 genes
- D. 1500-2000 genes Discuss
- 5. In the time since E. coli and Salmonella diverged evolutionarily
Options- A. there has been little change in either genome
- B. E. coli has acquired many genes via horizontal transfer
- C. E, coli has lost approximately 50% of its genome
- D. none of these Discuss
- 6. The replication of chromosomes by eukaryotes occurs in a relatively short period of time because
Options- A. the eukaryotes have more amount of DNA for replication
- B. the eukaryotic replication machinery is 1000 times faster than the prokaryotes
- C. each chromosome contains multiple replicons
- D. eukaryotic DNA is always single stranded Discuss
- 7. During which of the following process a new copy of a DNA molecule is precisely synthesized?
Options- A. Trasformation
- B. Transcription
- C. Translation
- D. Replication Discuss
- 8. The enzyme that catalyzes the synthesis of DNA is called
Options- A. DNA polymerase
- B. DNA gyrase
- C. DNA ligase
- D. helicase Discuss
- 9. During DNA replication in prokaryotes, synthesis begins on the circular chromosome
Options- A. always at the same place
- B. at any stretch of DNA that is high in AT pairs
- C. randomly on the chromosome
- D. at the promoter Discuss
- 10. Which of the following possesses both 5'-3' and 3'-5' exonuclease activity?
Options- A. Kornberg enzyme
- B. DNA polymerase III
- C. Taq DNA polymerase
- D. None of these Discuss
DNA Replication problems
Search Results
Correct Answer: is a function of the 3'-5' exonuclease activity of the DNA polymerases
Correct Answer: Functional genomics
Correct Answer: Mitochondria have evolved from endosymbiotic bacteria
Correct Answer: 250-350 genes
Correct Answer: E, coli has lost approximately 50% of its genome
Correct Answer: each chromosome contains multiple replicons
Correct Answer: Replication
Correct Answer: DNA polymerase
Correct Answer: always at the same place
Correct Answer: Kornberg enzyme
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