Answer :................................................
Define Virus
. Difference B/W Bacteria & Virus
Virus :Viruses are particles composed of an internal core containing
either DNA or RNA (both not both )
covered by a protective protein coat
A virus consists of :::
1.Nucleic acid
core : containing either DNA or RNA as their genome but not both
2.Capsid : a
Protein coat that encloses the nucleic acid genome
3.Envolope:
Certain viruses are surrounded by a lipid containing membrane (envelope)
outside the capsid .Envelope contains certain
viral antigens
Functions :
*Protection
*It also
helps in attachment to the target cell
|
Traits
|
Virus
|
Bacteria
|
|
1.Size
|
Bellow
300nm ,Small pox virus is largest
|
Above
300nm (Staphylococcus-1000nm)
|
|
2.Site
|
Usually
intracellular
|
Intracellular
Extracellular or
|
|
3.Nucleic
acid
|
Either
DNA or RNA , Never both
|
DNA
or RNA , Never
|
|
4.Ribosome
|
Absent
|
Present
|
|
5.Outer
surface
|
Protein
capsid & lipoprotein envelops
|
Rigid
wall containing peptidoglycan layer
|
|
6.Microscopy
|
Not
seen by light microscope
|
Usually
seen by light microscope by
|
|
7.Multiplication
|
Replication
|
Binary
fission
|
|
|
||
|
8.Culture
|
Cannot be cultured in
artificial & cell free media
|
Can be cultured in
artificial & cell free media
|
||||||
|
9.Metabolic activity
|
Absent
|
Present
|
||||||
|
10.Antibiotic sensitivity
|
Resistant
|
Sensitive
|
||||||
|
11.Interferon
Sensitive
|
Sensitive
|
Resistant
|
||||||
Comments
Post a Comment
Thank you