How can viruses be observed?
Through an electron microscope.
Can viruses be filtered?
No, they can pass through filters.
Where do viruses reproduce?
Only in living cells.
Do viruses occur in different strains?
Yes.
What genetic material do viruses contain?
Either RNA or DNA.
Can viruses undergo mutation?
Yes.
How can viruses be destroyed?
By ultraviolet radiations.
Do viruses have a cellular structure?
No, they lack cellular structure and enzymes.
Do viruses have their own metabolic activity?
No.
Can viruses be crystallized?
Yes, and stored in bottles.
How do viruses behave outside an organism?
They are non-living.
Are viruses resistant to antibiotics?
Yes, they are resistant to a broad range of antibiotics like tetracycline.
What are the largest viruses and their size?
Pox viruses (250nm).
What are the smallest viruses and their size?
Parvoviruses (20nm).
Can viruses be grown on artificial media?
No, they cannot be grown on artificial media (glassware).
List three living characteristics of viruses.
- Have genetic material. 2. Undergo mutation. 3. Reproduce inside host cell using host machinery.
List three non-living characteristics of viruses.
- Non-cellular. 2. Lack enzymes and coenzymes. 3. Can be crystallized and stored in a laboratory.
Why are viruses considered the boundary between living and non-living?
They behave as non-living, inert particles outside the host but show living characteristics inside a host.
List all 5 living characteristics of virus
- Have genetic material
- Reproduce inside host cells using host machinery
- Destroyed by UV radiation and chemicals
- Have different strains
- Undergo mutation
List all 5 non living characteristics of virus
Lacks enzymes and coenzymes.
Does not respire, uses energy from host.
No cellular structure.
Have ambivalent (fluctuating) nature.
Can be crystallized and stored in laboratory
Name the virus and bacteria approximately equal in size. And their sizes
Largest virus= pox virus 250nm
Smallest bacteria= mycoplasma 100-200nm
Another name for virus
Obligate virus
Obligate means
Survived only in one specific environment ( viruses survive only in host)
