#Question id: 40463
#Applied Microbiology
Assertion (A): In the presence of a high concentration of an attractant, the frequency of bacterial tumbling decreases (longer runs).
Reason (R): Attractant binding causes a conformational change in the receptor that inhibits CheA kinase activity, leading to reduced levels of CheY-P.
#Question id: 40464
#Applied Microbiology
Match the Che protein in Column I with its primary function in Column II.
| Column I (Protein) | Column II (Function) |
| A. CheA | 1. Response regulator that controls motor switch |
| B. CheY | 2. Phosphatase that dephosphorylates CheY |
| C. CheZ | 3. Sensor Histidine Kinase |
| D. CheR | 4. Constitutive Methyltransferase |
#Question id: 40465
#Applied Microbiology
During the Penetration phase of a typical T-even bacteriophage infection, which of the following events occurs?
#Question id: 40466
#Applied Microbiology
Consider the following statements regarding the Biosynthesis (Synthesis) phase:
Statement I: "Early proteins" synthesized during viral infection are typically enzymes needed for viral DNA replication and to halt host cell metabolism
Statement II: "Late proteins" include structural components like capsid proteins and tail fibers, which are synthesized after the viral genome has been replicated.
Which of the above statements is/are correct?
#Question id: 40467
#Applied Microbiology
Assertion (A): The time interval between the penetration of the viral DNA and the release of new virions is known as the "Eclipse Period."
Reason (R): During the eclipse period, complete infectious virus particles are not yet detected within the host cell because they are still being assembled from separate components.
Choose the correct option:
#Question id: 40468
#Applied Microbiology
Match the Viral Cycle Phase in Column I with the key molecular event in Column II.
| Column I (Phase) | Column II (Key Event) |
| A. Attachment | 1. Interaction of tail fibers with specific host cell wall receptors |
| B. Release | 2. Action of Lysozyme/Endolysin to break the cell wall |
| C. Lysogeny | 3. Integration of viral DNA into the host genome (Prophage) |
| D. Maturation | 4. Spontaneous self-assembly of capsid heads and tails |