singled-celled organisms protists bacteria viruses
DESCRIPTION
There are good protists and bad protists Good protists are able to create O 2 through photosynthesis Bad protists cause disease in humansTRANSCRIPT
Singled-Celled Organisms
ProtistsBacteriaViruses
ProtistsEukaryotes – have a nucleusMost have mitochondria for cellular
respirationMost have chloroplasts to make
their own foodMost live in water
There are good protists and bad protists
Good protists are able to create O2 through
photosynthesis Bad
protists cause disease in humans
Found in fresh water and ocean
No harmful effects on humans or environment
Bacteria
Smallest and simplest forms of life on the earth
Prokaryotes – do not have a nucleus Do not have most of the organellesHave only 1 DNA molecule which
controls their functions1 spoonful of garden soil may have
1010 bacteria
There are good bacteria and bad bacteria
Good bacteria make oxygen and
nutrients for other plants and animals
Bad bacteria cause disease in
humans
Bacterial Disease
• Bacteria and Protists that cause disease are called Pathogens.
• Pathogens invade the body of other organism and interfere with the normal cell functions.
Neisseria gonorrhoeae
Salmonella enteriditis
Viruses
Lack most of the characteristics of living cells,therefore most scientists do not call them living cells
Do not move around by themselvesDo not use energyDo not growALL THEY DO IS REPRODUCE!Only have 1 piece of DNA with a
protective coating of protein
How viruses reproduce
• The virus invades another cell, that cell is called a host cell. The virus uses that host’s DNA to reproduce.
Influenza virus
Influenza virus
Herpes Virus
Herpes Virus
Hepatitis B virus causes both acute and chronic liver infections
Rotaviruses infect the lining of the intestine and cause diarrhea ,
especially in children.