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Viruses

Total questions: 25

Worksheet time: 17mins

Name
Class
Date
1.

Which is not one of the 6 characteristics of all living things?

a)

Needs oxygen

b)

Grows and Develops

c)

Reproduces

d)

Excretes

2.
What is the first step of the virus reproduction cycle?
a)
The viruses genetic material (DNA) starts to take over the functions of the cell
b)
The host cell bursts open, releasing the new viruses
c)
The virus injects its genetic material into the cell
d)
A virus attaches to the surface of a host cell
3.
Which of the following is an example of how living things are classified?
a)
Differences
b)
Similarities
c)
Movement Method
d)
Habitat Location
4.
What is the last step in the viral reproduction cycle?
a)
A virus attaches to the surface of a host cell
b)
The proteins and genetic material start to assemble in the cell
c)
The host cell bursts open, releasing the new viruses
d)
The virus injects its genetic material into the cell
5.

Reasons that viruses are considered to be nonliving is because

a)

They have no metabolism

b)

They cannot reproduce on their own

c)

They cannot make proteins

d)

all of the above

6.

A(n) _____ is a virus that enters a bacterial cell.

a)

endospore

b)

virion

c)

plasmid

d)

bacteriophage

7.

When a virus invades a living cell, its _______

takes over the cell's functions.

a)

surface proteins

b)

genetic material

c)

capsid

d)

lipid envelope

8.

What do viruses have in common with living cells? They both

a)

store genetic information

b)

have chloroplasts

c)

use glucose for cellular respiration

d)

have nuclei

9.
The genetic material of a virus is in the form of
a)
RNA
b)
DNA
c)
either RNA or DNA
10.

Lysis is

a)

rupture of a cell membrane

b)

replication of a virus

c)

multiplication of the genetic material in the cell

d)

the same as lysogenic

11.

Viruses are _______.

a)

producers

b)

consumers

c)

parasites

d)

decomposers

12.
Viruses are found in _____.
a)
air
b)
water
c)
soil
d)
all of these
13.

The enzyme injected into host cell which copies viral RNA into DNA (clue: the "retro" function)

a)

polymerase

b)

lactase

c)

helicase

d)

reverse transcriptase

14.
Which of the following is one important difference between a virus and a bacterial cell?
a)
a virus is much larger in size than a bacterial cell
b)
a virus always causes more severe disease than a bacterial cell
c)
a virus can never reproduce on its own, but a bacterial cell can
d)
a virus does not contain genetic material, but a bacterial cell does
15.
viral genes copied
a)
a
b)
b
c)
c
d)
e
16.
virus attaches
a)
a
b)
b
c)
c
d)
d
17.
new viruses assembled
a)
b
b)
c
c)
d
d)
e
18.
Injection
a)
b
b)
c
c)
d
d)
e
19.
host cell breaks open
a)
a
b)
c
c)
d
d)
e
20.

What part of a virus is the protein capsule that houses the genetic material (DNA/RNA)?

a)

tail

b)

sheath

c)

capsid

d)

glycoprotein

21.

HIV infects

a)

erythrocytes

b)

platelets

c)

lymphocytes

d)

none of the above

22.

Antiretrovirals:

a)

are drugs to combat HIV infection

b)

may prevent a virus from attaching to a target cell

c)

are often administered to HIV +ve preganant women

d)

all of the above

23.

HIV infection

a)

can be cured

b)

always leads to AIDS

c)

is a bacterial disease

d)

none of the above

24.

the HI virus

a)

has a lipid envelope

b)

possesses no capsid

c)

contains DNA in its core

d)

has glycoprotein attachments

25.

AIDS occurs generally when the CD4 cell count is less than:

a)

100/ml blood

b)

200/ml blood

c)

300/ml blood

d)

400/ml blood

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