Bacteria and Viruses - PC\|MAC
Name
Date
Bacteria and Viruses
Section 2 Viruses and Prions
Main Idea
Details
Scan the table and time line in Section 2 of the chapter. Write three facts you discovered about viruses from these elements.
1.
2.
3.
Review Vocabulary Use your book or dictionary to define protein.
protein
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
New Vocabulary
Use the new vocabulary terms in the left column to complete the following paragraph.
capsid
A
is genetic material within a protein coat, but
lysogenic cycle
it has no organelles or other characteristics of life. The genetic
material lies inside its
, or outer layer of protein. In
lytic cycle
the
, viral genes instruct the host cell to make
many copies of the viral RNA or DNA. Some viruses replicate in a
prion
, in which the viral DNA integrates into a host
chromosome and lies dormant for some time. A
,
retrovirus virus
such as the HIV virus, contains RNA instead of DNA. Mutation in
the genes of a normal protein called a
is responsible
for diseases such as "mad cow."
Academic Vocabulary Define widespread to show its scientific meaning.
widespread
Bacteria and Viruses 183
Name Section 2 Viruses and Prions (continued)
Date
Main Idea
Details
Viruses
I found this information
on page
.
Model of one type of virus. Label its parts.
Viral Infection
I found this information
on page
.
Synthesize why many viruses cannot pass from one species to another.
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Label steps A, B, C, D, and E of a lytic cycle in the figure below. Use the following terms.
? Assembly ? Lysis and Release
? Attachment ? Replication
? Entry
Nucleic acid
Bacteriophage
Bacterial DNA
Bacterial host cell
A
B
The bacteriophage injects its nucleic acid into the bacterial cell.
184 Bacteria and Viruses
E The host cell breaks open and releases new virus particles.
D New virus particles are assembled.
C
The host's metabolic machinery makes viral nucleic acid and proteins.
Name Section 2 Viruses and Prions (continued)
Main Idea
Details
Date
Sequence the steps of a lysogenic cycle.
Viral DNA integrates into a chromosome of a host cell.
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Retroviruses
I found this information
on page
.
Evaluate and discuss the role of reverse transcriptase in the replication cycle of HIV.
Prions
I found this information
on page
.
Summarize information about prions by completing the table.
What is a prion?
What causes a prion to become harmful?
How might humans contract a What is the result of prion
prion-caused disease?
infection?
SUMMARIZE Conclude whether viruses that replicate by the lytic cycle or the lysogenic cycle are more dangerous. Explain your reasoning.
Bacteria and Viruses 185
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Date
Tie It Together
Create a quiz to help you review key topics in this
SYNTHESIZE
chapter. Write one question with its answer for each major topic listed below.
Topic: Diversity of Prokaryotes Question:
Topic: Metabolism of Prokaryotes Question:
Answer:
Answer:
Topic: Prokaryote Structure Question:
Answer:
Topic: Ecology of Bacteria Question:
Answer:
Topic: Identifying Prokaryotes Question:
Answer:
Topic: Viruses Question:
Answer:
Topic: Reproduction of Prokaryotes Question:
Answer:
Topic: Retroviruses Question:
Answer:
Topic: Survival of Bacteria Question:
Answer:
Topic: Prions Question:
Answer:
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
186 Bacteria and Viruses
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