VIRUS - lcps.org

VIRUS - lcps.org

VIRUSES What is a VIRUS? Viruses are small infectious agents They are so small that they can only be seen with a very powerful electron microscope

Ebola Virus under electron microscope Swine Flu Virus under electron microscope What is a VIRUS?

Viruses are highly specific to the cells they infect Viruses that infect bacteria are called bacteriophages A retrovirus is a virus that contains RNA rather than DNA A virus can reproduce only by infecting living cells; Once they infect a cell, they use that cells materials to produce

more viruses Parts of a Virus A typical virus is composed of a core of DNA or RNA (nucleic acids) surrounded by a protein coat (capsid)

Viruses come in a wide variety of shapes and sizes The capsid contains proteins that allow a virus to bind to a cell and trick the cell into allowing it inside DNA or RNA Capsid BODY

Check for Understanding With your partner, explain whether a virus is living or non-living (think back to the characteristics of life). Time: 1 minute Living or Non-Living?

Viruses are considered NON-LIVING WHY? They are not made up of cells They are not capable of living independently (require a host cell) They do not grow and develop They do not obtain and use energy

They do not respond to their environment Viral Infection Viral Infection/Reproduction Once a virus is INSIDE the host cell, two different things can occur LYTIC INFECTION: The virus immediately

makes copies of itself and causes the cell to burst (releasing the replicated viruses) LYSOGENIC INFECTION: The virus intertwines its DNA with the host DNA, but lies dormant for a period of time. In a sense it hides out until it is ready to enter the lytic stage

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