pathogens and communicable disease

• carries pathogens between organisms • eg water and insects

• prokaryotes= no membrane bound organelles or nucleus • only pathogenic bacteria will cause communicable disease • reproduce by binary fission • produce toxic waste

• all types of eukaryotes • viruses called bacteriophages can also use prokaryotes

• protoctista= includes multicellular organisms • protista= unicellular

• eukaryotic organisms • wide variety of feeding methods • single celled • most are not pathogenic • pathogenic are parasites - transmitted through vector

use the people or animals they infect as their host organism

eukaryotic organisms, that are often multicellular, but sometimes single celled - pathogenic are parasitic, releasing enzymes to host tissue

They have to digest food to obtain their nutrients, so they secrete digestive enzymes into the food source and absorb the nutrients

• feed of living plants and animals • these ones cause communicable disease

• infect the plants • stopping photosynthesis

produce millions of tiny spores which can spread huge distances

• take over cell metabolism, as viral genetic material is inserted into host cell DNA • take over cell and digest contents • completely digest living cells and destroy them • produce toxins which poison and damage host cells, some toxins break down cell membranes or inactivate enzymes or prevent cell division

tuburculosis

ring rot

HIV influenza

tobacco mosaic

malaria

potato blight

athletes foot

black Sigatoka