Asked in PMC Practice Test 11 (2021) 2021Moderate

The phage that causes the lytic cycle is called?

Correct answer: D. Both a and b

  • A. Virulent phage
  • B. Lytic phage
  • C. Temperate phage
  • D. Both a and b

Explanation

A and B. The phage that causes the lytic cycle is called a lytic phage or virulent phage. These phages have a specific life cycle in which they attach to a host cell, inject their genetic material (usually DNA) into the host cell, and hijack the host's cellular machinery to produce new phage particles. Eventually, the host cell bursts open, or lyses, releasing the newly produced phages to infect other cells. This cycle can occur relatively quickly, often within a matter of minutes or hours, and results in the death of the infected host cell.A temperate phage is a type of bacteriophage, or virus that infects bacteria, that is capable of undergoing both the lytic and lysogenic life cycles. Unlike lytic phages, which always enter the lytic cycle and cause the host cell to lyse and die, temperate phages can choose to enter the lysogenic cycle and integrate their genetic material into the host cell's chromosome, becoming a prophage. Thus option D is correct.

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About Viruses

Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.

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