viruses part 1

1.

1 point

The protein coat of a virus is know as a

2.

1 point

a phage that becomes part of a bacterial chromosome is a

3.

1 point

The bursting of a host cell is also called

4.

1 point

What type of life cycle is characteristic of temperate viruses?

5.

1 point

Viruses are classified according to which genetic material,____________or_______.

6.

1 point

Early work on viruses was done on the

7.

1 point

New, complete virus particles are known as

8.

1 point

Viruses are much_________then bacteria in size.

9.

1 point

The type of virus above is called a
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10.

1 point

If a virus does not cause disease immediately after it enters the orginism, it is said to be:

degenerative

obligante

virulent

temperate

11.

1 point

Which of the following is a helical virus?

prion

Tobacco Mosaic Virus

polio virus

HIV

12.

1 point

the term Viroid refers to a:

disease-causing particle made of RNA that has no capisd

weakened strain of virus that can be used for making vaccines

polyhedron virus grown in a tissue culture

virus that causes disease immediately

13.

1 point

What is the structure of the virus that causes the common cold?

rod-shaped

hairpin

Icosahedron

helical

14.

1 point

Louis Pasteur's treatment for rabies worked by:

reducing the symptoms if rabies so well that people could survive the infection

injecting weakened virus into infected people to stimulate disease-fighting mechanisms

killing the rabies virous

provided antibiotics against the virus from dogs that had had rabies and survived

15.

1 point

Tranduction is the process in which:

viruses can reproduce outside the host cell

the pro phage integrates into the host cell

a phage pocks up a portion of host cell DNA and transfers it to another host cell

viral protein molecules are separated on the basis of their specific electrical charges

16.

1 point

sometimes a virous can carry some of its host's genes with it into the next host cell it infects. This process is known as:

transduction

replication

Lysogeny

entry

17.

1 point

Which of the following is often used to determine an organism's antibody response to viruses?

Tissue culture

serology

electrophoresis

inoculation

18.

1 point

Retro viruses are the only viruses that:

have no protein coat

make DNA from RNA

contain both DNA and RNA

Contain RNA

19.

1 point

The T-even phages can infect and destroy:

bacteria cells

nerve cells

tobacco cells

potato cells

20.

1 point

Which structure in a T4 phages contain proteins that have a chemical affinity with bacterial cell walls?

base plates

capsids

collars

tail fibers

21.

1 point

When cold viruses invade the human body, most are quickly destroyed by the body's immune system. A few of the viruses will not be destroyed because they:

will be destroyed by their host cells instead

have switched to the lysogenic life cycle to escape the immune system

are resistant to immediate attack by the immune system

are too virulent for the immune system to handel

22.

1 point

The genomes of some RNA viruses take over the machinery of the host cell by:

using DNA polymerase to make viral DNA from viral RNA

migrating directly to the host ribisomes to make viral proteins

inactivating the host cell ribosmes

causing transduction genetic recombination

23.

1 point

scientists think that viruse evolved after host cells because

viruses are more complex than host cells

viruses require cells to survive

fossil evidence suggest that this is the case

evidence suggest that cells took a much longer time to evolve

24.

1 point

Acquired immune deficiency syndrome (AIDS) is caused by a:

viroid

prion

helical virus

retrovirus

25.

1 point

viruses that introduce viral genes into the bacteria without causing cell lysis of the production of virions are

virulent phages

lytic phages

temperate phages

none of the above

26.

1 point

viruses are classified based on all of the following exept

size

type of cell membrane

shape of protein coat

type of nucleic acid

27.

1 point

Viruses can peproduce themselves

by splitting in two

in a dead cell

in the air

only living inside a living cell

28.

1 point

The ability of a virus to cause disease is called

seencitivity

activity

reistance

virulence

viability

29.

1 point

What is the basic structure of a virus?

DNA or RNA surrounded by a protein coat

a tiny cell surrounded by a cell wall

a capsid surrounded by a protein coat

a tail sheath surrounded by a tail fiber

30.

1 point

Bacteriophages infect

cells undergoing the lytic cyvle

other viruses

bacteria only

any available host cell

31.

1 point

Viruses cause infection by

forming endospores in the body

entering body cells and replicating

producing toxins that harm the body

reproducing independently inside the body

32.

1 point

In composition, a rod shaped virus is about__% protein and___% nucleic.

50,50

95,5

75,25

85,15

33.

1 point

The protein produced by animal cells to fight off viral infections is known as

HIV transcriptase

AZT

Bactrtiophagease

interferon

34.

1 point

A person could get AIDS from an HIV carrier in all of the following ways EXCEPT...

using the same toilet

blood transfusion

sexual intercourse

using the same needle for injections

35.

1 point

During a lytic infection, the host cell is

destroyed

prepared for the lysogenic cycle

copied many times over

all of the above

36.

1 point

Another name for obligate intracellular parasite is host cell

True

False

37.

1 point

Another name for obligate intracellular parasite is host cell

True

False

38.

1 point

Viral DNA undergoes mitosis during the replication phase of the lytic cycle

True

False

39.

1 point

most icosahedral viruses are less than 200 nm in diameter

True

False

40.

1 point

reverse transcriptase in an enzyme that makes DNA from RNA

True

False

41.

1 point

Viruses are the smallest disease-causing agents known to scientest

True

False

42.

1 point

A temperate virus becomes virulent when it enters the lytic cycle

True

False

43.

1 point

The rabies virus specifically attacks nerve tissue

True

False

44.

1 point

The sheath of the T4 phage attacks to a receptor site in the cell wall of the bacterial host

True

False

45.

1 point

A prion is a disease-causing particle that contains no nucleic acid

True

False

46.

1 point

The term "prophage" refers to earliest fossil evidence of viruses, thought to be ancestors of pacteriophages

True

False

47.

1 point

Viruses contain either DNA or RNA, but never both

True

False

48.

1 point

Elecrophoresis is the study of biological fluids

True

False

49.

1 point

Viruses can reproduce outside a host cell only if they undergo transduction

True

False

50.

1 point

Obligate intracellular parasites are bacteria commonly found in the human digestive tract

True

False