MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Both strands of DNA serve as templates concurrently in |
| A. | excision repair |
| B. | replication |
| C. | none of these |
| D. | mismatch repair |
| Answer» C. none of these | |
| 2. |
Which of the following enzymes unwind short stretches of DNA helix immediately ahead of a replication fork? |
| A. | Helicases |
| B. | DNA polymerases |
| C. | Topoisomerases |
| D. | Single-stranded binding proteins |
| Answer» B. DNA polymerases | |
| 3. |
Proofreading activity to maintain the fidelity of DNA synthesis |
| A. | is a function of the 3'-5' exonuclease activity of the DNA polymerases |
| B. | occurs after the synthesis has been completed |
| C. | occurs in prokaryotes but not eukaryotes |
| D. | requires the presence of an enzyme separate from the DNA polymerases |
| Answer» B. occurs after the synthesis has been completed | |
| 4. |
DNA replication rates in prokaryotes are approximately of the order of |
| A. | 1,00 bases per second |
| B. | 10 bases per second |
| C. | 10,000 bases per second |
| D. | 1,000 bases per second |
| Answer» C. 10,000 bases per second | |
| 5. |
Which of the following repairs nicked DNA by forming a phosphodiester bond between adjacent nucleotides? |
| A. | DNA gyrase |
| B. | Helicase |
| C. | DNA ligase |
| D. | Topoisomerases |
| Answer» D. Topoisomerases | |
| 6. |
During which of the following process a new copy of a DNA molecule is precisely synthesized? |
| A. | Transcription |
| B. | Trasformation |
| C. | Replication |
| D. | Translation |
| Answer» D. Translation | |
| 7. |
The synthesis of DNA by DNA polymerase occurs in the |
| A. | 5' to 5' direction |
| B. | 3' to 5' direction |
| C. | 3' to 3' direction |
| D. | 5' to 3' direction |
| Answer» E. | |
| 8. |
In E.coli, which enzyme synthesizes the RNA primer for Okazaki fragments? |
| A. | DnaC |
| B. | DnaA |
| C. | all of these |
| D. | DnaG |
| Answer» E. | |
| 9. |
The enzyme that catalyzes the synthesis of DNA is called |
| A. | DNA gyrase |
| B. | DNA polymerase |
| C. | helicase |
| D. | DNA ligase |
| Answer» C. helicase | |
| 10. |
Which of the following statements on replication in E.coli is correct? |
| A. | It occurs in bidirectional manner |
| B. | It occurs in a unidirectional manner |
| C. | Occurs only when λ phase has infected E. coli |
| D. | Always uses T7 DNA polymerase when infected by T7 phage |
| Answer» B. It occurs in a unidirectional manner | |