Presentation on theme: "Unit 11: Bacteria and Viruses. Agenda 3/28 1.Watch rest of Ebola Video 2.Warm up #1: Catching a cold 3.Notes: Microbes 4.Article: Food safety 5.Mini Lab:"— Presentation transcript:
Unit 11: Bacteria and Viruses
Agenda 3/28 1.Watch rest of Ebola Video 2.Warm up #1: Catching a cold 3.Notes: Microbes 4.Article: Food safety 5.Mini Lab: Potato Swabbing * NO HOMEWORK
Warm up 1: Catching a cold Check off the things that cause you to catch a cold (check as many as you’d like) Having a fever___ Being wet ___ Being wet and cold ____ Germs___ Spoiled food ___Imbalance of body fluid__ Cold weather___ lack of exercise___ Explain your thinking. Describe how people catch a cold.
I. Microbes A.Single-celled organisms 1.Invisible to the naked eye B.Where can we find microbes? 1.In the air we breathe, the ground we walk on, the food we eat, and they're even inside us! C.Have been around for 3.5 billion years
II. What do microbes look like? A.Magnified 1000’s of times and colored using dye E. coli, a bacterium which lives inside humans. A type of flu virus. Athlete ’ s foot.
III. Microbes: Three types A. Bacteria Ex: strep bacteria B. Virus Ex: rotavirus C. Fungi Ex: mold
IV. Bacteria A.Have three main shapes spirilla little balls(cocci) rods (bacilli) B. Can move about on their own
V. Virus A.Come in 1000s of different shapes and sizes. B. They hang about waiting to meet a ‘host’ which they then invade, hijacking the host’s cells. **Beware the air you breathe and door handles! (especially if its Ebola, ahhhhhhh!!
VI. Fungi A.Not just mushrooms !! B. Athlete’s foot, penicillin, and yeast. C. Yeast is used in bread making (It’s cute, too!!)
VII. What can bacteria do ? A.Bacteria in the Cafeteria 1.Bacteria do many good things, such as decompose waste and give texture and flavour to food. 2.Bacteria can give off oxygen when they ‘eat’. * Next let’s read an article about food safety!
Potato Experiment 1.Make a hypothesis about what your potato is going to look like. 2.One group member can come up to the front and find their potato. 3.Record your data (how did it change, what do you see?)… Don’t forget your picture! ** DO NOT open the baggie!!! Stinky= NO NO
I. Pathogens A.Pathogen 1.Any disease-causing agent
II. What is a virus? A.A virus is made of DNA or RNA and a protein coat. 1.Non-living pathogen 2.Can infect many organisms
III. Viral Structure A.Viruses have a simple structure. 1.genetic material 2.capsid, a protein shell 3.maybe a lipid envelope, a protective outer coat
IV. Bacteriophage A.Bacteriophages infect bacteria. capsid DN A tail sheath tail fiber
V. Viral Entry A.Bacteriophages pierce host cells B.Viruses of eukaryotes enter by endocytosis C.Viruses of eukaryotes also fuse with membrane
VI. Viral infections A. A lytic infection causes the host cell to burst The bacteriophage attaches and injects its DNA into a host bacterium. The viral DNA forms a circle. The viral DNA directs the host cell to produce new viral parts. The parts assemble into new bacteriophages. The host bacterium breaks apart, or lyses. Bacteriophages are able to infect new host cells.
VI. Viral Infection B. A lysogenic infection does no immediate harm The viral DNA is called a prophage when it combines with the host cell ’ s DNA. Although the prophage is not active, it replicates along with the host cell ’ s DNA. Many cell divisions produce a colony of bacteria infected with prophage. The prophage may leave the host ’ s DNA and enter the lytic cycle.
Brainpop: Viruses esandconditions/viruses/
Agenda 4/1 1.Warm up #2 2.Check potatoes 3.HIV/AIDS article 4.Flu Attack video 5.Comic strips
Warm up 2: Viruses 1.What is a pathogen? 2.What type of virus infects bacteria? 3.Why are viruses considered non-living? 4.What are the 2 infectious cycles of bacteriophages?
Potato Experiment Day 3 1.One group member can come up to the front and find their potato. 2.Record your data (how did it change, what do you see?)… Don’t forget your picture! ** DO NOT open the baggie!!! Stinky= NO NO
Flu Attack hQ * Watch carefully, we will be doing an activity relating to this video!!!
Agenda 4/2 1.Warm up 3: Fighting Pathogens 2.Check potatoes 3.Share any comic strips 4.Notes: Vaccines and Bacteria 5.Brain pop: Bacteria and bacterial resistance 6.Music Vid: Bubonic Plague (Hollabck guuurl)
Warm up 3: Fighting pathogens 1.What is a vaccine? What does a vaccine do? 2.What type of pathogens do vaccines work on? 3.What is an antibiotic? How do they work? 4.What type of pathogens do antibiotics work on?
Potato Experiment Day 4 1.One group member can come up to the front and find their potato. 2.Record your data (how did it change, what do you see?)… Don’t forget your picture! ** DO NOT open the baggie!!! Stinky= NO NO
I. Vaccines (For viruses) A.Vaccines are made from weakened pathogens 1.A vaccine stimulates the body ’ s own immune response. 2.Vaccines prepare the immune system for a future attack. 3.Vaccines are the only way to control the spread of viral disease.
III. Bacterial “Reproduction” A.Asexual reproduction B.Conjugation 1.transfer of genetic material plasmid b/w bacterial cells by direct cell-to-cell contact conjugation bridge TEM; magnification 6000x
IV. Bacteria Becoming Harmful A.Normally harmless bacteria can become destructive. 1.immune system may be lowered
V. Antibiotics A.Used to fight Bacterial infections B.Antibiotics may stop bacterial cell wall formation C.Antibiotics do not work on viruses D.Prevention is best method to fight bacterial disease
VI. Bacterial Resistance A.Bacteria are gaining resistance to antibiotics 1.overuse 2.underuse 3.misuse B.Antibiotics must be used properly