small, circular piece of DNA located in the cytosol of many bacteria

a weakened or dead (inactive) form of a virus

hides inside the host cell can be inactive for months or years before it forces the cell to reproduce it

a virus that becomes active immediately after entering the cell, forcing the host cell's own machinery to make more viruses

an inflamed blister in or near the mouth, caused by activation of a latent virus. The cells destroyed by the activated virus form the cold sore.

A tiny, nonliving particle that invades and then reproduces inside a living cell.

outer protein coat of a virus

living cell in which a virus replicates

a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus

the slimy outer coating around a bacterium

the whip-like structure used to move a bacterium

A thick-walled protective spore that forms inside a bacterial cell and resists harsh conditions.

cycle of viral infection; results in replication of virus and cell destruction

the way bacteria replicate where one cell divides into two cells of the same size

a viral reproductive cycle in which the viral DNA is added to the host cell's DNA and is copied along with the host cell's DNA

The fluid portion of the cytoplasm.

A tiny organism that lives in one of Earth's harshest environments

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