Question

name three viruses that use the lytic cycle and three that use the lysogenic cycle.

Answer 1

• During infection a phage attaches to a bacterium and inserts it genetic material into the cell. after that a phage usually follows one of two cycle.

LYTIC CYCLE --

• The phage infects a bacterium hijacks the bacterium to make lots of phages ,and then kills the cell by making it explode.
• in the lytic cycle , a phage acts like a typical virus ,its host cell and uses the cell resources to make lot of new phages ,causing the cell to burst.
• In lytic cycle viral DNA destroy the cell DNA ,take over cell functions and destroy the cell.
• the virus replicates and produces progeny phages.
• in lytic cycle ,there are symptoms of viral infection.
• in lytic cycle phage DNA replicates independently.

VIRUSES IN WHICH LYTIC CYCLE OCCURS-

1. COMMON COLD VIRUS
2. INFLUENZA VIRUS
3. RABIES VIRUS

LYSOGENIC CYCLE --

• The phage infects a bacterium and inserts its DNA into bacterial chromosome ,allowing the phage DNA to be copied and passed on along with the cells own DNA.
• In lysogenic cycle , the virus combines its DNA into the host's cell DNA forming a Prophage. this infection can lie dormant for a period of time before symptoms occur.
• in lysogenic cell virus not destroy the cell and the virus does not produce progeny.
• in lysogenic cycle there are no symptoms of viral infection.
• in lysogenic cycle, phage DNA's replication occurs with the bacterial DNA replication machinery.

VIRUS THAT USE LYSOGENIC CYCLE --

1. HEPATITIS B VIRUS
2. CHICKEN POX VIRUS
3. HIV
4. HERPES