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Virus Structure, Classification, and Cycles of Infection
Samuel Quinn, Maxwell DeAngelo, Mason Holmes Virus Structure, Classification, and Cycles of Infection
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Overview 1. Virus and Virus Structures 2. Adenovirus 3. Retrovirus
4. Lytic Cycle 5. Lysogenic Cycle 6. ABC's
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What is a Virus? an effective agent that duplicates its self- inside living cells Can infect all life forms Particles are made of proteins and nucleic acids Non- living Max DeAngelo
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Virus Structure Capsid : Protein shell of the virus
z Virus Structure Capsid : Protein shell of the virus Genetic information Max DeAngelo
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Viruses Structures: T4 Bacteriophage
z Viruses Structures: T4 Bacteriophage Made of a Tail sheath and Tail fibers Contains DNA in the head Infects Bacteria in order to spread Max DeAngelo
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Symptoms of a Bacteriophage
Fever Chills Diarrhea vomiting Max DeAngelo
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Andenovirus Andenovirus affect mostly young children
Click to add text Andenovirus Andenovirus affect mostly young children Targets intestines Targets Urine Tract Targets Eyes Targets Respiratory System Samuel Quinn
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Adenovirus An example is sore throat Challenging time talking
Painful when swallowing Can affect anyone Drink hot drinks Samuel Quinn
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Retrovirus caused by reverse transcriptase
z Retrovirus caused by reverse transcriptase the opposite of transcription RNA is transcripted into DNA Samuel Quinn
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Retrovirus An example of an retrovirus is HIV
Targets the immune system Can also be called AIDS One of the symtoms is swollen glands Immune sytem defends body Samuel Quinn
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Lytic Cycle Step 1: Virus attaches to bacteria and inserts DNA into it
Step 2: New viruses are created in the bacteria Step 3: Viruses lyse out of the bacteria (cell dies) Step 4: Process repeats Mason Holmes
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Lysogenic Cycle Step 1: Virus injects DNA into bacteria
Step 2: Viral DNA joins the bacterial chromosome Step 3: Host cell copies DNA polymerase Step 4: The cell splits Mason Holmes
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Difference Between lytic cycle and Lysogenic Cycle
Lysogenic cycle involves prophage Lysogenic cycle involves the splitting of the cell Lytic cycle is faster Mason Holmes
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Similarities Between Lytic Cycle and Lysogenic Cycle
Both cycles have the same outcome Created by virus injecting DNA into bacteria Mason Holmes
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What is a T4 Bacteriophage Made Up Of?
RNA – Surface proteins – Membrane Envelope DNA in the tail sheath – RNA in Head – Surface proteins DNA in the Head – Tail sheath – Tail fibers TEM’s – Viruses - Capsids Max DeAngelo
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What is a Virus? A Memory Bound Organelle
Particles are made of proteins and nucleic acids The Flu A living particle Max DeAngelo
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Which is not a sympton of HIV?
a. Swollen Glands b. Headache c. Trouble Speaking d. Muscle Pain C Samuel Quinn
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What does HIV target a. Immune System b. Brain c. Heart d. Nasal Passage A Samuel Quinn
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What is a Similarity Between the Lytic and Lysogenic Cycle
Both include prophage Both include the cell splitting Both have the same outcome Both take the same amount of time Mason Holmes
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What is the First Step of the Lytic Cycle
Viruses reproduce inside the cell Virus attaches to bacteria and inserts DNA into it Cell splits Host cell copies DNA polymerase Mason Holmes
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Overview 1. Virus and Virus Structures 2. Andenovirus 3. Retrovirus 4. Lytic Cycle 5. Lysogenic Cycle 6. ABC's
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