PREDESCU PART 2

1.

1 point

The genetic alteration of a cell's genome
is called

transformation

reverse transcription

genome conversion

invasion

2.

1 point

An example of an emerging virus is

Herpes

polio

rubella

CJD

Ebola

3.

1 point

Which of the following is smallest?

eukaryote cell

bacteria

bacteriophage

cell membrane protein

4.

1 point

Viruses range in size from _________.

under 2 nm

under 200 nm

200-500 nm

500-900 nm

bacterial to eukaryotic cells

B-D

5.

1 point

The first virus to be purified was the

flu virus

tobacco mosaic virus

smallpox virus

polio virus

plague virus

6.

1 point

Viruses are most conveniently thought of as

lost chromosomes

the most primitive bacteria.

particles of genomes

prions

escaped genomes

7.

1 point

Select the single best answer to the numbered question.
Place the steps of virus multiplication in the proper order if, 1= adsorption, 2= assembly, 3= release, 4= uncoating, 5= penetration, 6=biosynthesis of viral nucleic acids and proteins:

1, 5, 4, 2, 6, 3

5, 4, 2, 6, 1, 3

5, 1, 6, 4, 2, 3

1, 5, 4, 6, 2, 3

1, 6, 5, 2, 4, 3

8.

1 point

Some differences between animal viral reproduction and bacteriophages are:

animal viruses enter by endocytosis

the entire virus enters and the genome undergoes uncoating

viral release involves budding

the viral particle acquires a membranous envelope by budding

all of the above.

9.

1 point

Of the viruses listed below, the most lethal is

influenze

ebola

measles

herpes simplex

10.

1 point

Why is it difficult to develop vaccines for retroviruses?

their small size evades the immune system

RNA mutates more frequently than DNA

the capsid of retroviruses is resistant

vaccines can only target blood-borne pathogens.

11.

1 point

The basic structure of a virus contains:

a nucleic acid

a cell wall

a protein coat

both a and b

both a and c.

12.

1 point

Antiviral drugs that are used after infection often prevent:

cell division

immune system degradation

reinfection by other viruses

uptake of the virus

13.

1 point

Which of the following diseases has NOT been reduced or eliminated by vaccines?

smallpox

AIDS

polio

measles

14.

1 point

Retroviruses are different from viruses in that:

they have RNA instead of DNA

they can become dormant

they are symmetrical

all of these.

15.

1 point

Why do some viruses seem to go away and then return
later, like a cold sore?

host has been infected with a different strain

the immune system forgot the virus

the virus had entered the lysogenic cycle

the virus mutated

they got permission from CDC.

16.

1 point

Naked strands of RNA not covered by a capsid are ________.

oncogenes

phage

prions

viroids

naked viruses

17.

1 point

Vaccines can be used to prevent viral infection by:

creating an immune response in the host

destroying any viruses that enter the host

creating a blocking protein on the cell

preventing replication of the virus.

18.

1 point

Chronic infection with hepatitis C virus usually leads to:

Leukemia

Kidney failure

Liver cirrhosis

Inflammation of pancreas.

19.

1 point

Diseases such as Creutzfeldt-Jakob disease and bovine spongiform encephalopathy (BSE), or mad cow disease, are caused by ________.

oncogenes

phage

prions

viroids

bacteria

20.

1 point

Viruses are often named after/by:

where they were first discovered

the scientist who discovered it

the animal that carries it

all of these.

21.

1 point

What happens after the virus has been taken up by
the cell?

it begins making protein

it divides

it inserts into the host DNA

it switches to infectious mode

22.

1 point

When a virus kills the infected host cell in which it is replicating, the reproductive cycle is called a _____ cycle.

lysogenic

phagocytic

lytic

viroidal

endocytic

23.

1 point

How do viruses reproduce?

they divide by mitosis

sexually, by external fertilization

replication outside the host

inserting DNA into the host cell.

24.

1 point

Typically, viruses form _______________ around their nucleic acid.

an envelope

a cell wall.

a capsid

a cell membrane

a capsule.