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What is a virus?
A submicroscopic, parasitic, filterable agent consisting of genetic material (DNA or RNA) enclosed by a protein coat which multiplies inside living cells and force cell to synthesize structures which spread virus to other cells.
Why are viruses tough to fight with drugs?
Because they are hiding inside cells (drug would kill the cell), antibiotics kill probiotic cells, and there are few drugs that kill viruses.
What type of microscope is used to observe viruses?
Viruses that infect bacterial cells are called _?_.
Bacteriophage, or phage
The protein coat that surrounds the genetic material is the _?_.
Each capsid is composed of protein subunits called _?_.
_?_ can have a polyhedral (many sided) geometric shape, or a helical tube-like shape.
_?_ are roughly spherical, have an envelope membrane (composed of lipid, protein and carbohydrate) that surrounds the capsid, in some viruses.
Some viruses, particularly bacterial viruses, have complicated structures and are called _?_.
In the _?_, phage multiply rapidly and cause cell to burst (cell lysis).
In the _?_, phage insert DNA into host's DNA where it remains dormant for long periods; certain conditions can trigger this to begin.
Also known as budding; when phage have gained their genetic components from host cell and are ready to infect other cells.
Phage, or genetic, burst
_?_ is a way for DNA from one bacterial cell to be transferred to another bacterial cell through viral infection.
Many devastating diseases are caused by viruses- can you name some?
_?_ are clear spots that show up on a lawn of bacteria when virus particles are present and have successfully infected cells on plate.
What is a lawn?
A solid layer of bacterial cell growth on a plate.
A virus characterized by a period of no symptoms when virus is inactive is known as a _?_.
A virus that is capable of producing tumors is known as an _?_.