Virus Study Guide

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Virus Quiz

 

 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 1.
Viruses are considered nonliving because
a.
they cannot reproduce by themselves.
b.
they are not made up of cells.
c.
they cannot carry out metabolism by themselves.
d.
All of the above
 2.
The study of viruses is a part of biology because
a.
they belong to the kingdom Eubacteria.
b.
they are about to become extinct.
c.
they are living organisms.
d.
they are active inside living cells.
 3.
Biologists now know that viruses
a.
are the smallest organisms.
b.
consist of a protein surrounded by a nucleic acid coat.
c.
contain RNA or DNA in a protein or lipid-protein coat.
d.
all form the same crystalline shape.
 4.
The capsid of a virus is the
a.
protective outer coat.
b.
cell membrane.
c.
nucleus.
d.
cell wall and membrane complex.
 5.
Viruses are classified according to
a.
whether they contain RNA or DNA.
b.
the shape of their genome.
c.
whether they have a membrane envelope.
d.
All of the above
 6.
All viruses have
a.
cytoplasm.
c.
mitochondria.
b.
ribosomes.
d.
None of the above
 7.
Tobacco mosaic virus
a.
is able to be crystallized.
b.
causes disease in tobacco plants.
c.
is smaller than a bacterium.
d.
All of the above
 8.
Scientists first began to study viruses because they
a.
were seen through a microscope.
b.
could not be seen but caused disease.
c.
formed crystals.
d.
were made of cells.
 9.
Viruses that use reverse transcriptase to cause their host cells to transcribe DNA from an RNA template are called
a.
bacteriophages.
c.
retroviruses.
b.
antibodies.
d.
capsoviruses.
 10.
Which of the following contains only RNA?
a.
a prion
c.
a viroid
b.
a virus
d.
All of the above
 11.
Unlike viruses, prions
a.
are capable of reproducing outside of a host cell.
b.
are composed only of protein.
c.
can cause brain infections.
d.
can be treated with antibiotics.
 12.
A typical virus consists of
a.
a protein coat and a cytoplasm core.
b.
a carbohydrate coat and a nucleic acid core.
c.
a protein coat and a nucleic acid core.
d.
a polysaccharide coat and a nucleic acid core.
nar001-1.jpg
 13.
Refer to the illustration above. Which structure could possibly be made of RNA?
a.
structure 2
c.
structure 4
b.
structure 3
d.
structure 5
 14.
Refer to the illustration above. Which structure is found outside the cell after the cell is infected?
a.
structure 1
c.
structure 3
b.
structure 2
d.
structure 4
 15.
Viruses
a.
are cellular organisms.
b.
reproduce only in living cells.
c.
have nuclei and organelles.
d.
are surrounded by a polysaccharide coat.
 16.
Animal viruses often infect only specific host cells because
a.
the virus must have the same DNA as the host cell.
b.
the host cell must have specific receptors for proteins on the virus surface.
c.
viruses have receptors for host cell glycoproteins.
d.
the enzymes of the virus can attach only to specific host cells.
 17.
In which cell cycle(s) does viral DNA become integrated into the host cell’s DNA?
a.
lytic
b.
lysogenic
c.
neither lytic nor lysogenic
d.
both lytic and lysogenic
 18.
Antibiotics are ineffective against viral infections because
a.
host cells protect the viruses.
b.
viruses have enzymes that inactivate the antibiotics.
c.
antibiotics interfere with cellular processes that viruses do not perform.
d.
viral protein coats block the antibiotics from entering the virus.
 19.
Which of the following is not a viral disease of humans?
a.
hepatitis
b.
SARS
c.
shingles
d.
All of the above are viral diseases of humans.
 20.
Which of the following is not linked to cancer?
a.
Ebola virus
c.
hepatitis B virus
b.
human papillomavirus
d.
Epstein-Barr virus
 21.
Which of the following human activities is most closely associated with the emergence of viruses not previously seen in humans?
a.
absence of a vaccination program
b.
crowded living conditions
c.
clearing of forests for housing
d.
eating uncooked meat
 22.
Most scientists think that early viruses originated from
a.
other viruses.
b.
existing cell parts.
c.
animals.
d.
spontaneous generation.
 23.
HIV causes AIDS by
a.
converting a proto-oncogene to an oncogene.
b.
damaging a person’s blood vessels.
c.
destroying the covering of a person’s nerves.
d.
gradually destroying a person’s immune system.
 24.
Which of the following is not a vector of viral diseases?
a.
mosquitoes
c.
prions
b.
ticks
d.
humans
 25.
Which of the following has been the most successful at fighting viral diseases?
a.
vaccination
c.
drug therapy
b.
vector control
d.
Both a and b
 26.
Most scientists believe that viruses first appeared on Earth ____ living cells appeared.
a.
after
b.
a very long time before
c.
at the exact time when
d.
immediately before
 

Completion
Complete each statement.
 27.
The protein coat of a virus is called a(n) ____________________.

 28.
Viruses can vary in size and ____________________.

 29.
A virus that transcribes DNA from an RNA template is called a(n) ____________________.

 30.
An enzyme called _________________________ manufactures DNA that is complementary to a virus’s RNA.

 31.
____________________ are viruses that infect bacteria and have a polyhedral head and a helical tail.

 32.
All viruses reproduce by taking over the reproductive machinery of a(n) ____________________.

 33.
Viruses that infect a host cell and have their nucleic acid replicated but do not harm the host cell are in a(n) ____________________ cycle.

 34.
The replication of a temperate virus includes the ____________________ cycle.

 35.
The virus that causes AIDS is called _________________________.

 36.
Some viruses are thought to induce ____________________, a disease characterized by uncontrolled cell division.

 37.
The Ebola virus, the SARS virus, and hantavirus are examples of ____________________ viruses.

 38.
In the ____________________ cycle, viruses destroy the host cell.

 39.
Chickenpox and ____________________ are caused by the same virus.

 

Problem
 40.

A new disease has suddenly appeared and scientists are trying to determine whether the disease agent is a virus or a bacterium. They collect the following information:

1.      The disease can be transmitted through the air.
2.      The disease agent is too small to be seen under a light microscope.
3.      There are no known antibiotics that are effective against the disease.
4.      The genetic material of the disease agent is DNA.
5.      The disease agent cannot be cultured using any known culture medium.

Is the disease agent most likely a bacterium or a virus? Explain your answer. Write your answer in the space below.

 

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Quiz Viruses

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Viruses

 

 

True/False
Indicate whether the sentence or statement is true or false.
1.
Although viruses do not consist of cells, biologists consider them to be living because they are capable of reproduction.
2.
Some viruses have a membranous envelope surrounding the protein coat that helps them gain entry into host cells.
3.
Viruses consist of RNA or DNA surrounded by a coat of protein.
4.
Prions are the smallest known particles that are able to replicate.
5.
A virus can only reproduce by controlling a cell.
6.
Once a virus enters either a lytic or a lysogenic cycle, it cannot change to the opposite type of cycle.
7.
Prophages and proviruses can both enter lytic cycles and destroy host cells.
8.
People can contract the influenza virus more than once because the virus tends to mutate rapidly, avoiding the actions of the immune system.
9.
Smallpox is caused by bacteria.
10.
Chickenpox and shingles are caused by the same virus.
 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
11.
The study of viruses is a part of biology because
a.
they belong to the kingdom Eubacteria.
b.
they are about to become extinct.
c.
they are living organisms.
d.
they are active inside living cells.
12.
The capsid of a virus is the
a.
protective outer coat.
c.
nucleus.
b.
cell membrane.
d.
cell wall and membrane complex.
13.
A membranous envelope surrounding some viruses may be composed of
a.
lipids.
c.
glycoproteins.
b.
proteins.
d.
All of the above
14.
viruses : nucleic acids::
a.
water : ice
c.
simplicity : complexity
b.
brick : wood
d.
a jigsaw puzzle : individual pieces
15.
A typical virus consists of
a.
a protein coat and a cytoplasm core.
b.
a carbohydrate coat and a nucleic acid core.
c.
a protein coat and a nucleic acid core.
d.
a polysaccharide coat and a nucleic acid core.
viruses_files/i0180000.jpg
16.
Refer to the illustration above. Which labeled structure could possibly be made of RNA?
a.
Structure “B”
c.
Structure “D”
b.
Structure “C”
d.
Structure “E”
17.
In which type of cell cycle(s) does viral DNA become integrated into the host cell’s DNA?
a.
lytic
c.
neither lytic nor lysogenic
b.
lysogenic
d.
lytic and lysogenic
18.
A prophage differs from a provirus in that
a.
a prophage contains DNA, while a provirus contains RNA.
b.
a prophage is formed during a lysogenic cycle, while a provirus is formed during a lytic cycle.
c.
a prophage contains DNA found in the infecting virus particle, while a provirus contains DNA produced from viral RNA.
d.
a prophage becomes integrated into a host cell’s DNA, while a provirus cannot become integrated into a host cell’s DNA.
19.
Which of the following is not a virus linked to cancer?
a.
Ebola
c.
hepatitis B
b.
human papillomavirus
d.
Epstein-Barr
20.
Which of the following human activities is most closely associated with emerging viruses?
a.
absence of a vaccination program
c.
clearcutting of forests
b.
crowded living conditions
d.
eating uncooked meat

 

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Protists Quiz

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Simple Protists
  1. Plant-like protists are collectively called:
    protozoans
    algae
    diatoms
    pseudopodia
  2. Where would you find a paramecium?
    in quiet ponds
    in the human body
    in dirt
    on leaves
  3. Which of the following moves using pseudopodia?
    paramecium
    euglena
    diatoms
    ameba
  4. Which of the following is unicellular and heterotrophic?
    ameba
    paramecium
    algae
    both ameba & paramecium
  5. The word “pseudopodia” means:
    small cell
    fake eye
    false foot
    first animal

 

 

 

 

 

  1. Identify the organism pictured above.

ameba
paramecium
euglena
diatom

  1. Which organelle functions to remove excess water?
    micronucleus
    contractile vacuole
    pellicle
    gullet
  2. The ameba reproduces by:
    fusion
    endocytosis
    binary fission
    conjugation
  3. The paramecium belongs to the Kingdom ____ and the Phylum _____
    Ciliphora, Protista
    Protista, Ciliophora
    Protozoa, Protista
    Animalia, Protista
  4. Which of the following is autotrophic?
    paramecium
    foraminifera
    ameba
    euglena

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