Question

Phages which show lysogenic cycle are known as
(a) Lytic phage
(b) Temperate phage
(c) Virulent phage
(d) Avirulent phage

Answer 1

Hint: Lysogenic cycle related to the formation of new viruses from the old one by division and replication. This type of virus is a bacteriophage virus.

Complete answer:
A lysogenic cycle is where the reproduction of the virus takes place which means the formation of a new virus by the division of the parent virus. The lysogenic cycle also leads to the integration of nucleic acid of the virus and the formation of a new replica in the host. A virus doesn’t have its own RNA and DNA so it needs a host for its division, As a virus doesn’t depend on the chemical composition of the host’s DNA and RNA and it starts division once the virus gets the nucleic acid of the host.
The lysogenic phage generally takes place in bacteriophage. A bacteriophage is that type of virus that stays is bacteria and with the help of its nucleic acid, it reproduces, grows, and finally destroys the bacteria which show its phagocytic nature.
Temperate phage in bacteriophage shows the lysogenic life cycle as it helps in division penetration attachment and release of the virus in this phage bacteria live and reproduce normally and destroy after when the lytic phase start which leads to the continuous division of the virus which makes bacteriophage phagocytic.
So, the correct answer is ‘Temperate phage’.

Additional information: The virus is not considered as an avirulent pathogen because once it gets to enter the living body it starts destroying its cell by using nucleic acid of the cell. The virus is only avirulent in a non-living organism where the virus doesn’t get nucleic acid.

Note: The lysogenic cycle takes place in six steps, after the end of the lysogenic phage lytic phage starts. lytic phage forms many copies of the virus very quickly and after that, the cell gets destroyed. Lysogenic phage does not cause lysis of cells but both the lysogenic cycle and lytic phage combined cause lysis of cells and become virulent.