Asked in PMC Practice Test 29 (2021) 2021

The process in which the phage is called a prophage is known as which of the following?

Correct answer: D. Lysogenic

  • A. Induction
  • B. Penetration
  • C. Lytic
  • D. Lysogenic

Explanation

The process in which a phage (bacteriophage) integrates its genetic material into the host bacterium's chromosome and becomes a part of it is known as lysogeny. The phage in this integrated state is referred to as a prophage. Lysogeny is a part of the life cycle of certain bacteriophages, where the viral genome becomes dormant within the host cell's chromosome. During lysogeny, the prophage is replicated along with the host cell's DNA as the cell divides. Under certain conditions, the prophage may exit the host chromosome and enter the lytic cycle, where it becomes active and produces new virus particles.

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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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