Virus replication in Bacteriophage in botany department

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VIRUS  REPLICATION  IN  BACTERIOPHAGE
- Virus are cellular , non- cytoplasmic obligate parasite.
- Dmitri lvanovsky 1892 1st  discover virous.

 TYPES OF VIRUS---
-Their are 3 types,

1.Animal virus
2. Plant virus
3. Bacteriophage

1. ANIMAL VIRUS




- The virus which infect and live inside the animal cell ,including man are called as animal virus.
- Their genetic material is RNA or DNA.
EX- influenza virus , rabies cirus etc.

2. PLANT VIRUS
- The virus thats infects the plant are called as plant virus.
- The genetic material is RNA, but it remains present in protin cort.
EX- tobacco amsic virus , potato virus etc.

3. BACTERIOPHAGE
-The virus which infect the bacterial cell is called as bacteriophage .
-The genetic material DNA.

REPLICATION   IN  BACTERIOPHAGE
- The replication in bacteriophage is 2 types name as,

A. LYTIC CYCLE OF BACTERIOPHAGE
- Lytic cycle complited in following 6 following steps,

1. ABSORPTION
- The virous become attached to the host body (bacteria cell) at this stage.
- Bacteriophage attached in active site in cell wall of host body .

2. PENETRATION
- In stage of penetration , bacteriophage tail penetrate the host body by the help of lysozyme.
- Lysozyme help to the break the cell wall.
- Virus tail release DNA inside the host body .
- Head part of the bacteriophage out side the host body.

3. UNCOATING
- The virual capside is remove and degraded by  host enzyme by releasing the nuleic acid.

4. REPLICATION
- The replication mechanism depends on the viral genome.
- For some RNA virus , the infecting RNA produuces messenger RNA (mRNA ) .
- This is translation and protein produce.
- For other with negetive stranded RNA and DNA  , viruses are produced  by transcription  then translation.
- The mRNA is used to host cell to produce virus components.
- The virus components are DNA and protein.

5. MATURATION AND ASSEMBLY  OF VIRUS CAPSIDS
-Inside the host body , there is assemble of new capsids protein and DNA and to produce new doughter bacteriophages.

6. RELEASE
- Finaly the bacterial cell fully composed of doughter viruses (Bacteriophage) and brust the bacteria cell and released the outside.
- About 25 minutes 200 new bacteriophage are produce.


B. LYSOGENIC CYCLE OF BACTERIOPHAGE
- Bacteriophage attached with a host body and released DNA into the host body.(In case of lytic cycle)
-The  Phage DNA in the host cell integrates with bacteriophage DNA it is called as prophage.
 -The prophage replicates with the host DNA and get cell division .
- The viral DNA  and bacterial DNA is separated , this prosses is called induction .
- Lysogenic bacteria resistant to infection but in case the lysogenic cycle entair to the lytic cycle the host body get infected.


*      Prof.- Dr ramakant pradhan 
best of luck for your exam , you study and ask u doubt or other wise dout in other long question in biology ask me in comment box .ok  student by . 


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