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Virus PPT Notes

The document provides an overview of viruses, detailing their structure, including the capsid and envelope, and the roles of viral nucleic acids. It explains the lytic and lysogenic cycles of viral infection and the function of vaccines in preparing the immune system to combat viruses. Additionally, it briefly mentions prions and viroids as other infectious agents.

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Riham Al-kholy
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18 views2 pages

Virus PPT Notes

The document provides an overview of viruses, detailing their structure, including the capsid and envelope, and the roles of viral nucleic acids. It explains the lytic and lysogenic cycles of viral infection and the function of vaccines in preparing the immune system to combat viruses. Additionally, it briefly mentions prions and viroids as other infectious agents.

Uploaded by

Riham Al-kholy
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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Virus Notes

Name___________________________________assign#_______
Viruses:
1. A virus is a_________________ particle with a simple structure. Composed of a Bacteriophage
____________ ___________ (DNA or RNA) surrounded by a protein __________.
2. Virus Structure:
 Capsid - The capsid is the protein shell that encloses the nucleic acid;
Three functions:
1) it ____________________ the nucleic acid from digestion by enzymes,
2) contains special _____________ on its ____________ that allow the virus
to attach to a host cell, and
3) Allow virus nucleic acid ______________________ the host cell’s
membrane and, in some cases, to
_____________ the infectious nucleic acid into
the cell's cytoplasm.
 Envelope - Surrounds the capsid. Composed of
two ____________ layers interspersed with protein
molecules.
3. Viral Nucleic Acid
 The nucleic acid of each virus encodes the genetic
information for the synthesis of all
___________________.
 Only a few groups of viruses use ________________.
 Most viruses maintain all their genetic information
with the single-stranded _______.

4.
Lytic Cycle Lysogenic Cycle

The virus attaches to a host cell and ___________ its After the virus embeds its nucleic acid into the
nucleic acid _______ the cell. chromosome of the host cell, the viral nucleic
acid is _______________along with the host cell’s
DNA.
The viral nucleic acid is immediately _______________,
Then the virus becomes _____________ for a period
eventually causing the host cell to ________________,
releasing new viral particles.
of time. The virus may suddenly become
____________, resuming the lytic cycle.
These new viruses then ___________ other cells.

Vaccines
Made from _________________ of a virus.
Then when our bodies see the virus again it ______________ and fights
the virus.
Antibiotics ________ ___________ work on viruses!
Most vaccines contain purified fragments taken from
____________________ bacteria or viruses. Some vaccines contain
________________ viruses, but in a very ________________ form that dos
12. 13.
not cause disease.
"_______________" the immune system how to recognize and fight
bacteria and viruses
Stimulates the body’s ____________________ response
Virus Notes
Name___________________________________assign#_______

16. Prions:
 Prion-is a type of infectious agent made only of _____________.
17. Viroids:
 Viroids-small naked single-stranded _____________ ____________ that infect _____________ cells and
cause disease.

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