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Viruses
What is a Virus? (pages 482-483)
1. What are viruses?
2. What is the structure of a typical virus?
3. What is the protein coat of a virus called?
4. What occurs when viruses get inside of the cells?
Viral Infection (pages 484-486)
5. Why are most viruses highly specific to the cells they infect?
6. What are bacteriophages?
7. Complete the flowchart about a lytic infection.
The bacteriophage attaches to the bacterium’s ___________________.
The bacteriophage injects its _________________ into the cell.
The cell makes mRNA from the bacteriophages’s __________________.
The virus’s genes wreck the cell, causing it to _________________.
The bursting of the cell releases new bacteriophage ___________________.
8. What is the difference between a lytic infection and a lysogenic infection?
Viruses and Disease (pages 486-487)
9. What are some human diseases that viruses cause?
10. What is a vaccine?
11. How does a vaccine prevent a viral disease when injected into the body?
12. What are cancer causing viruses known as?
13. What are retroviruses and what happens when they infect the cell?
14. What is a prion?
15. Do you think diseases should be considered a form of life? Describe the reasons for your
opinion.
Extra Credit – Answer these questions from information from all of chapter 19. Write the correct
vocabulary term in the blanks. Use the circled letter in each word to find the hidden word. Then,
write a definition for the hidden word.
What is the viral DNA that is embedded in a host’s DNA?
___ ___ ___ ___ ___ ___ ___ ___
What is a rod-shaped bacterium?
___ ___ ___ ___ ___ ___ ___ ___
What is a compound that blocks the growth and reproduction of bacteria?
___ ___ ___ ___ ___ ___ ___ ___ ___ ___
What is a virus that infects bacteria?
___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
What is a prokaryote that can capture sunlight for energy but also needs organic compounds for
nutrition?
___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
What is the exchange of genetic information that occurs from one bacterium to another through a
hollow bridge?
___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
What is a virus that contains RNA as its genetic information?
___ ___ ___ ___ ___ ___ ___ ___ ___ ___
What is the process in which nitrogen is converted into a form plants can use?
___ ___ ___ ___ ___ ___ ___ ___
___ ___ ___ ___ ___ ___ ___ ___
Hidden word: ___ ___ ___ ___ ___ ___ ___ ___
Definition: