Virus

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Antigen

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Virus

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Receptor

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Cell

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Lytic infection

Back 3

An active, infectious stage, it is called

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Lysogenic infection

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A dormant (sleeping) stage. It is called a

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Step 1:

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Virus attaches to cell

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Step 2:

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viral DNA is injected into cell. Bacteria DNA is destroyed,

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Step 3:

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viral DNA is copied & viral parts are made.

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Step 4:

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Viral parts are assembled.

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Step 5:

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Cell bursts (lyses) and releases new viruses. Viruses spread.

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Parasites

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is an organism that depends entirely upon another living organism (a host) for its existence in such a way that it harms that organisms.

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TwoGenetic material

Change over time

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How many characteristics of life do viruses possess?

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Pathogens

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is any agent that causes diseases.

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Lysogenic Cycle

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Virus enters long (dormant) period between an infection and onset off disease.

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Prophage

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Viral genetic material (DNA) incorporates into a host’s DNA called

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retroviruses

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Viruses with RNA are called

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Antibodies

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are proteins used by the immune system to identify and neutralize foreign invaders such as viruses and harmful bacteria.

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Helper T- cell

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operates as a judge that identifies infections and “orders” their destruction to other white blood that make anti bodies – bloodstream – combat invading pathogens such as viruses and harmful bacteria.

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Viral Vectors

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viruses that contain beneficial genes or drugs within their capsids

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Vaccine

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is a weakened virus.