MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Vector Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following properties is due to lysogenic conversion by phages? |
| A. | Toxin production in Corynebacterium diphtheriae |
| B. | Toxin production in Clostridium botulinum types C and D |
| C. | Antigenic variation in Salmonella anatum |
| D. | All of the above |
| Answer» E. | |
| 2. |
Which of the following is/are synthesized from late mRNA? |
| A. | Phage structural proteins |
| B. | Proteins that help with phage assembly without becoming part of the virion structure |
| C. | Proteins involved in cell lysis and phage release |
| D. | All of the above |
| Answer» E. | |
| 3. |
In viruses with envelopes |
| A. | the envelope and the embedded proteins are encoded by the viral nucleic acid |
| B. | the envelope is derived from the host but it contains embedded proteins coded by the viral nucleic acid |
| C. | the envelope is coded by the viral nucleic acids, but the proteins come from the host's membrane proteins |
| D. | the envelope and its imbedded proteins are derived from the host's membranes |
| Answer» C. the envelope is coded by the viral nucleic acids, but the proteins come from the host's membrane proteins | |
| 4. |
Which capsid symmetry is exhibited by most of the phages? |
| A. | Icosahedral |
| B. | Helical |
| C. | None of these |
| D. | Complex |
| Answer» B. Helical | |
| 5. |
Contractile sheath of the tail is present in which of the following phages? |
| A. | T2 |
| B. | T3 |
| C. | All of these |
| D. | P22 |
| Answer» B. T3 | |
| 6. |
Which of the following bacteria can be typed by phage typing method? |
| A. | Salmonella typhi |
| B. | Staphylococcus aureus |
| C. | All of these |
| D. | Vibrio cholerae |
| Answer» D. Vibrio cholerae | |
| 7. |
__________ protein keeps the prophage dormant and prevents virus reproduction. |
| A. | Promotor |
| B. | Operator |
| C. | Enhancer |
| D. | Repressor |
| Answer» E. | |
| 8. |
WHAT_ARE_STICKY_ENDS??$ |
| A. | Ends of M13 vector |
| B. | 12 nucleotide stretch in lambda phage |
| C. | The replicated product phage DNA |
| D. | Ends on two sides of origin |
| Answer» C. The replicated product phage DNA | |
| 9. |
APPROXIMATE_SIZE_OF_LAMBDA_PHAGE_IS________?$ |
| A. | 23 kb |
| B. | 100 kb |
| C. | 49 kb |
| D. | 12 kb |
| Answer» D. 12 kb | |
| 10. |
Which of the following statements is not true in the context of infection by an M13 phage? |
| A. | Lytic phage |
| B. | Lysogenic phage |
| C. | New phage particles are continually synthesized |
| D. | The DNA is not integrated in host genome |
| Answer» B. Lysogenic phage | |
| 11. |
Which infection cycle is characterized by retention of the phage DNA molecule in the host bacterium for many thousands of cell division? |
| A. | Lysogenic cycle |
| B. | Lytic cycle |
| C. | Integrative Phase |
| D. | Protein synthesis |
| Answer» B. Lytic cycle | |
| 12. |
Which is a reason of instability of phage DNA molecule in the host cell in a lytic cycle? |
| A. | The huge size of phage DNA |
| B. | Inability of replicative enzymes |
| C. | Immediate synthesis of capsid |
| D. | Lytic cycle inefficiency |
| Answer» D. Lytic cycle inefficiency | |
| 13. |
The cycle which is completed quickly in the infection by a phage is ________ |
| A. | Lysogenic |
| B. | Lytic |
| C. | Replication |
| D. | Capsid formation |
| Answer» C. Replication | |
| 14. |
The replication of phage DNA molecule is associated with which step in the infection cycle of a bacteriophage? |
| A. | First step |
| B. | Second step |
| C. | Third step |
| D. | Preparation stage |
| Answer» C. Third step | |
| 15. |
Which of the following is an example of head-and-tail bacteriophage? |
| A. | M13 |
| B. | Lambda phage |
| C. | Pbr322 |
| D. | M16 |
| Answer» C. Pbr322 | |
| 16. |
What is the capsid (protective coat) of the bacteriophage made up of? |
| A. | DNA |
| B. | RNA |
| C. | Protein |
| D. | Organic acids |
| Answer» D. Organic acids | |
| 17. |
Which of the following is not true for a bacteriophage? |
| A. | A very simple structure |
| B. | Consist either DNA or RNA |
| C. | Bacteriophages are viruses |
| D. | Complex structure that infects bacteria |
| Answer» E. | |