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It’s 19-2, yo .

It’s 19-2, yo. Alix Vinson and Nicole Poling. Viruses. Oh yum. Viruses are particles of nucleic acid, protein, and in some cases, lipids that can only replicate by infecting living cells. That’s the definition. Please copy it. Facts About Viruses.

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It’s 19-2, yo .

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  1. It’s 19-2, yo. Alix Vinson and Nicole Poling

  2. Viruses. Oh yum. Viruses are particles of nucleic acid, protein, and in some cases, lipids that can only replicate by infecting living cells. That’s the definition. Please copy it.

  3. Facts About Viruses. • Viruses vary widely in size (but are usually quite small), structure, and gene capacity, however… • They all have one thing in common. After entering living cells they use the machinery of the infected cell to produce more viruses. How rude. • Viruses are specific to the cells they infect. For instance, bacterial viruses only infect certain types of bacteria. These are called bacteriophages.

  4. More facts. Yesssss. • A virus is composed of a core of DNA or RNA surrounded by a protein coat. • The protein coat I just mentioned is called it’s capsid. Want the whole definition to write down? Here you go. • capsid: a virus’s protein coat - The capsid is really quite convenient and allows the virus to enter a cell by binding to the receptors of the cell. Clever. - The cell transcribes and translates the viral genetic information into viral capsid proteins and bam. The virus is spread - The host cell makes copies of the virus and, in doing so, is destroyed.

  5. Viral Infection! When the virus has begun to spread around the cell two different processes may occur. Lytic Infection: when the host cell is lysed and destroyed. - In a lytic infection, a virus enters the cell, makes copies of itself, and causes the cell to burst. Lysogenic Infection: a host cell makes copies of the virus indefinitely - In lysogenic infection a virus integrates it’s DNA into the DNA of the host cell and the viral genetic information replicates along with the host cell’s DNA.

  6. Yay for infections. prophage: the viral DNA that is imbedded in the host DNA -Prophage may remain part of the DNA of the host cell for many generation before becoming active.

  7. RETROVIRUSES • A retrovirus is a virus that contains RNA as their genetic information. • When a retrovirus infects a cell it produces a DNA copy of the RNA. This DNA is inserted into the DNA of the host cell.

  8. Are Viruses Alive? Viruses ARE NOT alive because they live off of living things. They have many characteristics of living things such as: • They can reproduce • Regulate gene expression • And evolve

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