Download lessonuploads/Virus Basics

Name ______________________________ Class ___________________ Date __________________
#_____A
Viruses Basics 2-3
1. Name three diseases caused by viruses.
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IT’S A SMALL WORLD
_____ 2. About how many virus particles could fit in a single drop of blood?
a. about 5 billion
c. about 5 hundred
b. about 5 million
thousand
d. about 5 thousand
_____ 3. A virus’s effect on living things changes because
a. viruses disappear
c. viruses change rapidly.
quickly.
d. viruses never change.
b. viruses change slowly.
4. Because viruses are so ________________ and __________________ rapidly,
scientists are not sure how many different viruses there are.
ARE VIRUSES LIVING?
5. A virus can only reproduce inside a ____________________. Without them,
they cannot function!
6. Once a virus has entered a living cell (host), what does it force the cell to do?
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CLASSIFYING VIRUSES
7. What are four ways viruses can be grouped?
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8.Protein is one of the chemical building blocks of cells. Even though a virus is
not considered a living thing, it still has an outer coat made of protein. How
does it help a virus?
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Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
8
Bacteria and Viruses
Name ______________________________ Class ___________________ Date __________________
Viruses cont.
Match the correct description with the correct term. Write the letter in the space
provided.
_____ 9. shape of HIV and influenza viruses
a. crystals
_____ 10. shape of many viruses that attack only
bacteria
b. spacecraft
_____ 11. shape of tobacco mosaic virus
c. spheres
d. cylinders
_____ 12. shape of polio virus
13.
Give two examples of viruses that contain the genetic material DNA.
a. _____________________________________________________________
b. _____________________________________________________________
14.
Give three examples of viruses that contain the genetic material RNA.
a. _____________________________________________________________
b. _____________________________________________________________
c. _____________________________________________________________
A DESTRUCTIVE HOUSE GUEST
15. How is the lytic cycle different from the lysogenic cycle?
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16. ___________________ DO NOT kill viruses! However, antiviral medications
recently created will stop the virus from ______________________________.
17. What are two ways people can help prevent viral infections?
a. _____________________________________________________________
b. _____________________________________________________________
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
9
Bacteria and Viruses