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Viruses
Review for Viruses Quiz
Term | Definition |
---|---|
virus | a tiny, nonliving particle that enters and then reproduces inside a living cell |
host | an organism that provides a source of energy for a virus or another organism |
parasites | organisms that lives in or on a host and cause them harm (viruses act like these) |
bacteriophage | a robotlike shaped virus that infects bacteria |
reproduction | the one life process that viruses seem to do (with the energy from a host cell) |
protein coat | is on the outside of the virus, protects it, and helps it to attach to host cell |
genetic material | in core (or center) of virus and contains instructions for making new viruses |
lock and key | the shape of proteins on the outside of a virus allow it to attach to only certain cells |
active virus | immediately begins taking over cell functions and multiplying (ex. flu and common cold) |
hidden virus | virus's genetic material hides and becomes part of the cell's genetic material for a period of time before multiplying (ex. cold sores and HIV) |
gene therapy | when virus is used as a "messenger service" to enter cells and deliver genetic material that is needed |
common viral shapes (4) | round, tube-shaped, bullet-shaped and robotlike |
why viruses are considered to be nonliving | they do not have all of the characteristics of life (they don't carry out all 7 life processes) |
treatment for most viral illnesses | bed rest and drinking fluids |
how viruses are named | illness (sickness) they cause, organism they infect, where it was first found, who discovered it |
Size of viruses | much smaller than cells |