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Alysha King

on 30 March 2010

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Transcript of virus

Bacteria Viruses Characteristics
Bacteria vs. Viruses Bacteria:
Classified as prokaryotes
lack chlorophyll (green pigment
in plants that allows for the
production of food)
form colonies of millions or even
billions within a space as small
as a drop of water
classified based on shape
-spherical (coccus)
-rodlike (bacillus)
-spiral or corkscrew (spirochete)

All bacteria are surrounded by a cell wall. They can reproduce independently, and inhabit virtually every environment on earth, including soil, water, hot springs, ice packs, and the bodies of plants and animals. Most bacteria are harmless to humans. In fact, many are quite beneficial. The bacteria in the environment are essential for the breakdown of organic waste and the recycling of elements in the biosphere. Bacteria that normally live in humans can prevent infections and produce substances we need, such as vitamin K.

living characterists
- repoduce at a fast rate, only in living cells
- mutate
non living characteristics
- contain no cytoplasm

Viruses are too small to be seen by the naked eye. They can't multiply on their own, so they have to invade a 'host' cell and take over its machinery in order to be able to make more virus particles.Viruses consist of genetic materials (DNA or RNA) surrounded by a protective coat of protein. They are capable of latching onto cells and getting inside them.
Lactobacillus Acidophilus - naturally present in dairy products
Tabacillus Acidophilus - present in buttermilk, yogurt, sour cream, frozen desserts.
- prevents gastrointestinal infections.
E. Coli - present in the intestine, helps with digestion. Produces vitamin B-complex and vitamin K. Reproduction of Bacteria
Binary Fission - two bacterial cells that are genetically identical form. Brucellosis
- not a very common disease.
- bacterical disease that can affect the organs
- anyone can contract this disease
- people who have close contact with butchering of deer and livestock have better cahnce

- intermittent or irregular fever
- headache
- weakness
- profuse sweating
- chills
- weightloss
- aches
- Long lasting or chronic symptoms - reoccurent fevers, joint pain, fatigue

- No set time to when symptom will appear. Usually within 30 days

- Can last up to a year

- Treatment - tetracycline or tetracycline plus streptomycin (treatmeant of choice.)
Dengue Fever

- carried by mosquitoes
- during or shortly after the rainy season in tropical or subtropical areas of
- Africa, Southeast Asia and China, India, Middle East, Carribbean,
Central and South America, Australia, and South and Central Pacific.
- high fever
- severe headache
- retro orbital (behind the eyes) pain
- severe joint and muscle pain
- nausea and vomitting
- rash

- lots of bed rest
- Drink lots of fluids
- take medicine to reduce fever

- dress in protective clothes
- use mosquito spray
- keep unscreened windws and doors closed
- get rid of standing water in flower pots, containers...etc.
Microscopic, single-celled organisms belonging to Kingdom Monera that possess a prokaryotic type of cell structure, which means their cells are noncompartmentalized, and their DNA (usually circular) can be found throughout the cytoplasm rather than within a membrane-bound nucleus. They reproduce by fission or by forming spores. They can practically live everywhere. They can inhabit all kinds of environment, such as in soil, acidic hot springs, radioactive waste, seawater, deep in the Earth's crust, in stratosphere, and even in the bodies of other organisms. A submicroscopic infectious agent that is unable to grow or reproduce outside a host cell. It is non-cellular but consisting of a core of DNA or RNA surrounded by a protein coat. A virus requires a living cell for it to grow and reproduce similar to an obligate intracellular parasite. Many viruses can cause disease in host organisms but not all can cause disease. They’re also vital in recycling nutrients, such as the fixation of nitrogen from the atmosphere. Lytic Cycle
Considered to be the main method of viral reproduction. Steps: Attachment - The virus attaches itself to the host cells.
Injection - the virus inserts its genetic material into the host cells.
Integration - the genetic material tells the cells what to do.
Replication - the host cell build parts of the virus.
Assembly - the cell assembles the replicated parts into progeny viruses.
Lysis - the cell breaks open and each replicated virus can not infect other cells. Lysogenic Cycle Bacteriophage's nucleic acid fuses together with the hosts nucleic acid,
so that genetic information of the virus is transmitted through daughter cells. Nucleic acid is integrated into the host cells chromosome; a provirus is formed and replicated each time the host cell reproduces. A type of asexual reproduction common among prokaryotes where a cell divides giving rise to two cells, each having the potential to grow to the size of the original cell.
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