Question

1. If viruses were to be c;classified in manner similar to the classification of organisms, the broadest classification currently used for all viruses is the...

A) Phylum

B) Genus

C) Class

D) family

2. Which of the following is true concerning the viral envelope

A) Viral envelope is taken from the mitochondrial membranes

C) ALl viruses possess an envelope

D) The viral envelope is taken from the cellular membranes

E) The envelope may be cut apart by the action of nucleases

3. All of the following statements concerning virus taxonomy are true EXCEPT:

A) The ICTV establishes proper taxonomic schemes for virus classification

B) Staining is used as a means of classifying viruses

C) Currently, there are only three orders of viruses

D) Virus family names are sometimes derived from the name of an important virus within the family

4. Viruses can be inactivated by exposure/treatment to chemicals or physical agents. Choose which agent will inactivate herpes virus by preventing viral attachment to susceptible cells.

A) Alcohol

B) Ultra violet radiation

C) Heat

D) Neutralizing antibodies

E) A, C, D

(HINT: It's not B)

Answer 1

Ans. (a) Phyllum

The classification of organism have a hierarchy which converge from Kingdom, phylllum, class, order, family, genus and species. As we classify viruses on this basis the same idea would be used as the Kingdom will have to broadest classification and the species will have the narrowest one.

Ans2. (D) The viral envelope is taken from the cellular membranes

The mot of the viruses have viral envelops (eg. HIV and many animal viruses), this is the outer layer of the virus when at the stage of their life-cycle between host cells. The viral envelop is taken from the portions of the host cell membranes (phospholipids and proteins), but include some viral glycoproteins.

Ans3. (C) Currently, there are only three orders of viruses

The clasification of viruses can be done by ICTV classification which laid down various rules for the naming and classification of viruses early in the 1970s. There are hierarcy same as that used for classification of organism. There are 14 order of viruses, recognised till now.

Ans. (E) A, C, D

The Herpes virus is a disease causing virus which causes contagious sores, most often around the mouth or on the genitals. These can be inactivated or killed by lipid solvents that can be 0.5% Lysol in 5 min,  by 2,000 ppm (2,000 ul/liter) of bleach in 10 min; by rubbing alcohol of concentrations of 60%–80%. They can also be heat killed by pasteurization or >56°C for 30 min and you can use antibodies to neutrilize the virus.

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