Microbial world- viruses

Question 1

What is a virus?

Answer 1

A package of genetic information protected by a protein shell for delivery into a host cell to be expressed and replicated

Question 2

Which criteria is used to classify viruses?

Answer 2

Shape – Type and form of nucleic acid – Enveloped or naked – Mode of replication – Organization of the genome and antigenic differences

Question 3

What are the 7 categories in the baltiomor classification

Answer 3

1. dsDNA
2. ssDNA
3. dsRNA
4. • ssRNA
5. • ssRNA
6. ssRNA-RT
7. dsDNA-RT

Question 4

What are the functions of structural proteins in a virus?

Answer 4

Protect the genome
• Recognise viral nucleic acid for packaging
• Deliver viral nucleic acid to host cells

Question 5

List the different caspid type

Answer 5

Helical
Icosahedral
Complex

Question 6

What can caspids obtain from the host cell?

Answer 6

The lipid envelope

Question 7

Definition of a susceptible, resistant and permissive cell

Answer 7

Susceptible cell – has the functional receptor for the virus, the virus can enter the cell Resistant cell – No receptor, virus cannot get in Permissive cell – has the capacity to replicate the virus

Question 8

Where are the viral replication sites? White type of virus mainly replicates there?

Answer 8

Cytoplasm- RNA viruses

Nucleus- DNA viruses