Asked in PMC Practice Test 19 (2021) 2021Moderate

The phage that is involved in the lysogenic cycle of a bacteriophage is known as?

Correct answer: B. Lysogenic phage

  • A. Lytic phage
  • B. Lysogenic phage
  • C. Prophage
  • D. Bacteriophage

Explanation

Option A : The phage which causes lysis of host cells is known as lytic or virulent phage. Option: B The phage involved in the lysogenic cycle of bacteriophage is lysogenic phage also known as temperate phage. PTB XI Chap # 5 page # 75 Option C : All infections of bacterial cells by phages do not result in lysis. In some cells, viral DNA instead of taking over the control of the host's machinery, becomes incorporated into the bacterial chromosome. Phage in this state is called prophage. Option D : The viruses that attack bacteria are known as bacteriophage.

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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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