MICROBES CAUSE DISEASE!!

MessanaScience 8

MICROBES• = Microorganism, Microscopic Organism• _______________• _______________• _______________• _______________• _______________• Found _________________...water, surface of

living things, inside living organisms

DISEASE• Caused by a __________entering a place in

the body where they_____________________• Organism experiences ___________function• Show _______________= your body’s

response to disease (fever, vomiting, joint pain, skin condition, etc.)

• Can be _____________________________or _____________________________________

BACTERIA

• Single celled organisms – _________• Very small, Need microscope to see• **________________• Can be found on most materials and

surfaces – Soil, Water, Air, etc.• Billions on your _________and in

your body’s _____________track right now!

Harmless bacteria on the stomach lining

E. Coli O157:H7 can make you very sick.

Streptococcus can cause strep throat.

BACTERIA• Different shapes =_______________________• Have cell membrane, cell wall, &___________• Cytoplasm contains _________material

floating _________+ ribosomes (_________________or other organelles)

• Has ____________________& pili• Can move, reproduce, eat, etc.

Typical Bacterial Cell

Helpful vs. Harmful Bacteria• Harmful Bacteria = Germs, _______________– Cause disease by ___________________into body– Toxins are the _________________ from bacteria– Bacterial infections fever, swelling, rash– Treat with___________________!

• Helpful Bacteria:– Eat other ____________substances– Help plants and animals __________________to

be used by organism– ____________ food in your stomach

Clean skin has about 20 million bacteria per square inch

Viruses• VERY small!• Contains protein coat =________• Contains ______ or ______• NOT A ____________ CELL!!• _________ reproduce, eat, move, or maintain

homeostasis• Try to get inside ______________to reproduce• Must fit cell membrane like “________________”

Virus Replication• If virus finds suitable living host

cell…–DNA or RNA directs host cell to

_________________of virus particle–Copies of virus cause host cell

to____________________!–Viruses go on to

_________________cells

Virus invading Bacterial Cell

Viruses• Shaped life on Earth• Cause ____________in plants & animals• Affected _______________by

redistributing genes• Can protect organisms from

environmental contaminants• __________________viral infections

with anything – have to ______________

Parasites• An organism that has a _____________

relationship with a _________organism• Parasite lives _______or ______ the host• Slowly __________or _______host _________• EX:______________, bacteria,

ticks,_________________, heartworm, mites, fleas, athlete’s foot, fungi, invertebrate insects

• Are you ready for these pictures!?

Parasites

Fish Parasite & Blood Parasite