2. What are the traits of a prokaryotic cell?
• Prokaryotic cell have no membrane bound organelles
• Reproduce by binary fission
• They are single celled organism
• Most are smaller than Eukaryotic cell
• cell parts:
plasma memberane
cytoplasm
ribosomes
DNA/RNA
3. How do bacteria breathe ?
• Unlike human, bacteria have many ways to breathe
• They are classified into:
1-aerobic bacteria using oxygen
2- anaerobic bacteria respire by the help of
nitrates , sulphates and carbon dioxide
NO OXYGEN
4. What do bacteria eat and take in food?
• Take in food and obtain energy from breaking it down
• Feed on dead organisms
• Taking nutrients from living hosts
• Make their own food(lot of light)
• Use energy from chemical reactions like bacteria live
in dark ocean floor
5. Where do bacteria live?
• Bacteria are found every where in nature
• They are found in soil ,air ,
animals and plants
• On your body ,bacteria is found on your skin
,your mouth and your gut
6. Different ways bacteria is helpful to human
• Bacteria help in digestion
• In intestine bacteria makes vitamin K which help in
blood clotting
• Some bacteria prevent harmful bacteria from
growing in your intestine
• Bacteria help in manufacture of antibiotics
• Bacteria help in making dairy products
• Nitrogen fixation
7. How do bacteria move?
• Bacteria move to find food resources
• They move by
1- flagella and Pilli
2-twist as they move
8. How do bacteria reproduce?
• Binary fission:
cell division give 2 genetically identical cells , it takes
ideal conditions20 minutes
• Conjugation:
it is not considered reproduction , it only cause
genetic variation
12. How do bacteria keep the ecosystem healthy?
• Bioremediation
1-bacteria can absorb the oil from accidental oil spill
2-eat pollution by breaking down harmful substance
into less harmful substances
13.
14. What are pathogenic bacteria?
• Pathogens:
agents that causes disease
• Harmful bacteria that causes disease are few and
considered pathogens
• Some live normally in your body cause illness only in
case when immune system weakened
15. What causes bacterial diseases?
• Caused by
• 1-damaging tissues ex: tuberculosis
which invade lungs and breaks it down for food
2-producing toxins like that found in improperly
canned food causing food poisoning
ex: clostridium botulinum
16. Spreading and prevention
How are bacteria spread
• Bacteria can spread by getting
contact with sick people
• Touching food with dirty
hands
• People who cough and sneeze
spread germs
How are disease prevented
• Disease can be prevented by
washing hands
• Cook and consume food
quickly
• pasteurization
