Name: 
 

Viruses



Modified True/False
Indicate whether the sentence or statement is true or false.  If false, change the identified word or phrase to make the sentence or statement true.
 

1. 

Viruses are considered to be nonliving because they are not made of protein. _________________________

 

2. 

When a virus invades a living cell, its outer coat takes over the cell's functions. _________________________

 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

3. 

Viruses are considered to be nonliving because they
a.
cannot multiply.
b.
are not cells.
c.
produce wastes.
d.
use energy to grow.
 

4. 

Why are viruses like parasites?
a.
They destroy the cells they enter.
b.
They multiply.
c.
They use energy to develop.
d.
They make their own food.
 

5. 

A virus needs energy to
a.
make food.
b.
grow and develop.
c.
make cells.
d.
multiply.
 

6. 

Which phrase describes the size of virus particles?
a.
smaller than cells
b.
slightly larger than cells
c.
the same size as cells
d.
much larger than cells
 

7. 

Which statement about a virus's coat is NOT true?
a.
It protects the virus.
b.
It contains protein.
c.
It contains genetic material.
d.
It helps the virus attach to its host.
 

8. 

The genetic material of a virus is found in its
a.
coat.
b.
core.
c.
coat and core.
d.
nucleus.
 

9. 

A virus's proteins are important because they
a.
contain the genetic material.
b.
make new virus particles.
c.
provide energy for the virus.
d.
help the virus attach to its host.
 

10. 

Which of the following statements does NOT describe an active virus?
a.
It attaches to the host cell.
b.
It takes over the host cell's functions.
c.
It becomes part of the host cell's genetic material.
d.
It destroys the host cell.
 

11. 

A hidden virus
a.
cannot attach to a host cell.
b.
becomes part of the host cell's genetic material.
c.
immediately takes over the cell's function.
d.
attaches to but does not enter the cell.
 

Completion
Complete each sentence or statement.
 

12. 

A virus can multiply only when it is inside a(n) ____________________.
 

 

13. 

The ability to ____________________ is the only characteristic that viruses share with living organisms.
 

 

14. 

A virus's ____________________ contains the instructions for making new viruses.
 

 

15. 

The shape of the ____________________ in a virus's coat allows the virus to attach to certain cells.
 

 

16. 

A virus that begins to multiply immediately after it enters a cell is called a(n) ____________________ virus.
 

 

17. 

When a(n) ____________________ virus enters a cell, the virus's genetic material becomes part of the cell's genetic material.
 

 

Essay
 

18. 

A space probe finds no signs of life on another planet. Is it likely that there are viruses on that planet? Explain your reasoning.
 

19. 

Describe the basic structures of viruses and explain their roles.
 

20. 

Some people believe that taking antibiotics will help them recover more quickly when they have the flu. Explain what is wrong with this reasoning.
 



 
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