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Summary Topic 6 Viruses and HIV

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Edexcel Biology Topic 6 Viruses and HIV, Lytic and Lysogenic Cycle, HIV cycle, AIDS

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Course
Topic 6









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Study Level
A/AS Level
Examinator
OCR
Subject
Biology A
Unit
Topic 6
All documents for this subject (10)

Document information

Uploaded on
January 20, 2025
Number of pages
5
Written in
2023/2024
Type
Summary

Subjects

  • topic 6
  • edexcel
  • biology

Content preview

Viruses
Virus -
not in
of three domains
any
↳ no cell structure
S.I units
-
can reproduce inside a host cell

Virus
different types
-




. host
1 all
they go
into


animal
-




-



plant
-
bacterial= bacteriophage - lysis bacterial cells



2
. nucleic acid material limited
coding for
-


, capsomeres


or
-
DNA viruses
-
RNA viruses-C-19 ,
HIV
.


-
>
nucleocapsid -
carries INA or DNA in a protein coat of
cupsomeres



S PNAIRNA




Retroviruses -
reverse transcriptase not all &NA viruses
back to DNA
↳
first .




3 helical
.
capsid
protein



Eame
- capoa

↓ not a *
nated helical capsid
lot of
RNA

, Kosohedral faces
different
-
20 - 12 vertices

capsomeres




#
*
naked icosohedral
capsid
S.I units




Enveloped =
single bilayer
naked = nu bilayer

antigen
HIV) host cell : T helper
RNA virus = retrovirus
glycoprotein Gp120

Icosohedral

Enveloped
· protease

-
z
reverse transcriptase
S
*

· w




phospholipid- · Intergrase

bilayer
↳ Capsic



Lytic and Lysogenic cycles
Lytic :
-

attach tothe host cell (recognition
material
-generic entry
-


Replication -


capsid protein
Assembly of raw material
-




Lysis
-




Lysogenic cycle -
same but
dormancy period between
entry
and replication
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