Chapter 12 Communicable Diseases Flashcards
What is a disease
What is a communicable disease (2)
Pathogen
Vector
Disease = a condition that impairs normal function
Communicable disease is a disease caused by pathogens , which can be spread by ONE PERSON TO ANOTHER
Pathogens = organisms that cause disease
Vectors are other organisms that carry pathogens from one organisms to another , not being the pathogen themselves
What two ways and how can bacterium be classified ?
1) by shape
- rod shaped = bacilli, spherical , comma shaped , spiralled etc
2) by their CELL WALLS
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Explain how cell walls are different in bacterium and show which positive which negative
Why is it useful to know what wall
- if thick wall (peptidoglycan) , when you stain with Crystal violet , it all absorbs , and so alcohol won’t rinse it off, and so safranin dye counter stain remains masked. = gram positive
- if thin peptidoglycan then won’t absorb that much crystal violet, easily washed by alcohol and saddening red appears = red = negative !
2) different wall cells affect how bacteria react to antibiotics, so if you know you can prepare right type
How bacteria make bad
How often duplicate?
Duplicate every 20 mins and release so many toxins that damage cells like enzymes , cell membranes and disrupts metabolism this way etc
Viruses
How do they operate and make you feel sick
Why they such a good pathogen
Viruses invade living cells, where genetic material they take over biochemistry of the host cell and makes more viruses using their resources. Under stress they will cause cell to burst = make you feel sick
Reproduce insane and adapt and all are pathogenic
What are bacteriophages and what used for
Viruses can even attack bacteria and take over them, these are called bacteriophages.
- people use bacteriophages to IDENTIFY and then treat diseases (as they find the bacteria)
What are protoctista
How make sick
Single celled eukaryotic
- they cause harm by not taking over genetic material but digesting and using cell contents to replicate like malaria
DONT TAKE OVER CELL UNLIKE VIRUS
Fungi
Who do they target and How make sick
Where in organism do they target
How do they wipe out huge areas?
Target plants leaves
- some parasitic : damage by secreting enzymes to digest cell and absorb nutrients - this makes sick
- some release toxins
2) when reproduce produce millions of tiny spores produced , spread huge distances and cause infection
- remember they are saprophytic : digest food by releasing enzymes extracellularly
- attack leaves of plants making them not photosynthesis and die
How do fung
What three diseases caused by bacteria and to what organisms
Tuberculosis = anti mask : human and cow
Bacterial menginitis = human
Ring rot = potatoes and tomatoes
What three disease caused by viruses and what organisms
HIV/ AIDS- humans
Influenza - aniamls like human
Tobacco mosaic virus = plants
What three disease caused by fungi and what organisms
Black Sigatoka = banana plants
Ringworm = cattle
Atheletes foot = humans
Finally two disease caused by proticista and what organisms
Malaria = human
Potato/ tomato late blight = potatoes / tomatoes
What ring rot
What does it do
Any cure?
Bacterial disease
Damages leaves tubers and fruit
Field It cannot be used to grow for 2 years if hit
What is tobacco mosaic virus
What does it do
Any cure/ other solutions
Infects tobacco plants but 150 other species
Damages leaves, flowers in mosaic pattern
No cure = use resistant crops
What is potato blight , tomato blight late blight
What it do
What cure?
Protoctist
Hyphae penetrated cells to destroy leaves etc
No cure but resistant strains
