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Transcript of Starter: Watch Video How was the virus able to enter the cell? How are viruses able to reproduce? If...
![Page 1: Starter: Watch Video How was the virus able to enter the cell? How are viruses able to reproduce? If you breathe in the flu virus, will you automatically.](https://reader035.fdocuments.in/reader035/viewer/2022081517/5a4d1b187f8b9ab0599926dc/html5/thumbnails/1.jpg)
Starter:
Watch Video How was the virus able to enter the
cell? How are viruses able to reproduce? If you breathe in the flu virus, will
you automatically become sick? What are some other viruses you
know about? Are viruses alive? Can medications be used against
viruses?
3/16/2015
175 176Bacteria Bacteria
Application/Connection/Exit:
Ws
3/16/2015
Practice:
Notes
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Starter
• Watch and answer questions:
• http://www.schooltube.com/video/08aae2ef0da979dbbb5a/Flu-Attack-How-A-Virus-Invades-Your-Body
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•1 Starter•2. Notes•3. Worksheet
March 16, 2015AGENDA
B. 8 A
B.8A Define taxonomy and recognize the importance of a
standardized taxonomic system to
the scientific community while
reading and writing by completing notes and
a ws
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Date Lecture/ Activity/ Lab Page2/12 Ordering Fossils Activity 161-1622/13 Evidence of Fossils 163-1642/17 Test Review 165-1662/19-20 Classification 167-1682/23 Dichotomous Key Notes 169-1702/24 Dichotomous Key Project 171-1723/5 Cladagrams 173-1743/16 Bacteria, Viruses, and Protista 175-176
Table of Contents
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Bacteria, Viruses, Prions, and Protists
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Bacteria
• Unicellular or Multicellular?• Prokaryotic or Eukaryotic?• Cells Walls?
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Bacteria
• Unicellular• Prokaryotes• Cells walls containing peptidoglycan
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Bacteria
• Extremely Abundant– Cover nearly every square centimeter of Earth
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What are the differences between eubacteria and
archaebacteria?
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Eubacteria versus Archaebacteria
• Cell walls of Eubacteria have peptidoglycans while those of Archaebacteria do not.
• DNA sequences of archaebacteria is more similar to that of eukaryotes than to the DNA of eubacteria
• Archaebacteria often live in very extreme environments (hot springs, digestive tracts, Great Salt Lake, etc.)
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Bacterial Shapes
• Bacilli: rod shaped
• Cocci: spherical
• Spirilla: spiral, corkscrew
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Cell Walls
• Gram positive: stain violet due to thick peptidoglycan walls
• Gram negative: stain pink/red, have much thinner walls inside lipid layer
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Metabolism
Heterotrophs:• Chemoheterotrophs: must take in organic
molecules and a supply of carbon
• Photoheterotrophs: are photosynthetic but also need to take in organic molecules for carbon source
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Metabolism• Photoautotrophs: use light energy to make
carbon compounds
• Chemoautotrophs: use energy from chemical reactions to make carbon compounds
• Where might each type of bacteria be found?
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Binary Fission• When a bacteria
grows so that it has doubled in size, it replicates its DNA and divides in half
• Is this sexual or asexual?
• Identical or different daughter cells?
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Conjugation
• Some bacteria are able to exchange genetic information
• A hollow bridge forms between two bacteria and genes move from one cell to the other
• Increases genetic diversity of a population
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Conjugation
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Spore Formation
• Spores are formed when the bacteria produces a thick internal wall that encloses the DNA and part of the cytoplasm
• Why do you think this would be beneficial for bacteria?
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Spore Formation
• Occurs when conditions are unfavorable for growth
• Can remain dormant for years until conditions improve
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Spore Formation
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What are some benefits of bacteria?
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Benefits of Bacteria• Some are producers that undergo
photosynthesis• Some are decomposers that break down
dead matter to recycle the nutrients• Some convert nitrogen gas to a form that
can be used by plants (nitrogen fixation)
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What are some dangers of bacteria?
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Dangers of Bacteria• Break down cells and tissues for food Example: Tuberculosis (destroys lung
tissue)
• Release toxins (poisons) that travel through the body
Example: Streptococcus releases toxins into the blood stream causes strep throat and scarlet fever
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Vaccines
• A vaccine is a preparation of weakened or killed pathogens that are injected into the body
• This stimulates the body to produce immunity to the disease
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Vaccines
• Why do you think we don’t vaccinate everyone for all disease we have created vaccines for?
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Antibiotics• Antibiotics block the growth and
reproduction of bacteria• Used to treat bacterial infections
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Solve the Problem
• What would you do to find out what causes the tobacco leaves to be diseased?
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Viruses
• A virus is a core of DNA or RNA surrounded by a protein coat (capsid)
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Viruses• They can only reproduce by infecting living
cells• They enter a cell and use its cell
machinery to produce more viruses
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Retroviruses
• Contain RNA as genetic information instead of DNA
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Would you consider viruses living?
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Are Viruses Living?
• Cannot reproduce alone, must have a host cell
• Do not undergo growth or development• Do not obtain or use energy• Evolve
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Prions
• Diseases such as Scrapie (in sheep) and Mad Cow Disease are not caused by bacteria or viruses. What could cause them?
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Prions
• Contain only protein• Cause disease by forming protein clumps
which then induce normal proteins to become Prions
• The build up eventually damages nerve tissue
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Protists
• Domain?• Kingdom?• Prokaryotic or Eukaryotic?
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Protists
• Domain: Eukarya• Kingdom: Protists• Eukaryotic
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Protists
• Protists are defined by what they are not.
Protists are eukaryotes that are not animals, plants, or fungi.
They were the first eukaryotic organisms on earth.
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Types of Protists
• Animal-Like Protists: heterotrophs
• Plant-Like Protists: produce food through photosynthesis
• Fungus-Like Protists: obtain food by external digestion
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Animal-Like Protists
• Heterotrophs
cilliate
Sarcodine (amoeba)
sporozoan
zooflagellate
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Animal-Like Protists
• Malaria• African Sleeping Sickness
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Plant-Like Protists
• Carry out photosynthesis
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Fungus-Like Protists
• Grow in damp, nutrient rich environments• Absorb food through cell membranes
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Starter:
Watch Video How was the virus able to enter the
cell? How are viruses able to reproduce? If you breathe in the flu virus, will
you automatically become sick? What are some other viruses you
know about? Are viruses alive? Can medications be used against
viruses?
3/16/2015
175 176Bacteria Bacteria
Application/Connection/Exit:
Ws
3/16/2015
Practice:
Notes