Summary for A level Biology OCR A : Communicable Diseases
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Course
Communicable Diseases
Institution
OCR
Book
A Level Biology A for OCR Student Book
Short, detailed and specific definitions for each important keywords with some diagrams shown.
Notes written in order to help understanding.
Haven’t written useless information.
2. By cell walls -
Gram positive bacteria (purple / blue ) or Gram
negative bacteria (med)
-
tyres or cell walls auect how bacteria react to diueeeetauboiats
2. viruses
↳ non -
living agents which are ultimate parasites .
genetic material q virus takes
• viruses invade living cues
,
over
biochemistry q
on
prodding mane copies
↳ reprove rapidly material
genetic
•
Bacteriophages
-
viruses that attack bacteria
coat
Protein
off
3. protoctista
↳ eukaryotic organisms .
•
parasitic pathogens -
use animals as host
organism
requires it
vector
organism carrying pathogen and
transferring
.
-
•
4 .
Fungi
↳ Eukaryotic , multicellular , saprophytes ( reed or dead matter
)
• Some parasitic , peeling on plants and animals
↳ Stop plants photo syuthesivg , killing them .
contain spores which spuead urge distances , infecting may organisms
.
•
pathogens -
modes y actions
1. viruses - take over on metabolism by injecting viral DNA into host DNA
'
virus replicate
- and burst out q cell iuyectiug other cells .
2. fungi -
Digest hiring cells and
destroy them .
- some procure toxins damaging cells
3. protist take over cells and bureau oven as new
generation / owned
.
-
-
digest and use cen contents as
they neproclue
.
4 . Bacteria -
produce toxins that damage host cells
- break down cell membranes , inactivate enzymes , inleyeue with DNA (stopping replication)
, Animal and Plant Diseases
plant diseases
1 .
Ring Rot -
bacterial disease cy potatoes and tomatoes
by damaging blues
→
gram positive bacterium
→ once infects yield , west wait 2
years
.
TMV stunting
2. virus damaging levees growth and crop loss
-
,
↳ anects photosynthesis .
3- potato blight fungus line protist oomycete P infestans
- -
.
↳ no cue out ccuyul Margaret and chemical treatments weave infection risk .
4
.
Black Sigatoka -
fungus disease in bananas
↳ hyphae digests cells turning blues black -
tacky photosynthesis
disease
Resistant strains developed and fungicide control spuead.gr
.
↳
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