Virus and Bacteria

Viruses were discovered when…

Viruses were discovered when…

Adolf Mayer studied tobacco plants in 1883.

Adolf initially believed that ____ caused tobacco mosaic disease.

bacteria

Wendel Stanley

Isolated the tobacco mosaic virus in 1935.

Virus

A particle that causes disease in organisms and consists mainly of protein coat and nucleic acids.

Viruses cannot be seen with:

compound microscopes

When electron microscopes were invented,

scientists could find the shape of the virus.

Viruses are very ____ structures.

simple

Capsid

The protein coat that surrounds the DNA and RNA and protects the nucleic acid

Envelop

Lipid, Carbohydrate, and Protein cell membrane on the host cell that protects the virus nucleic acids.

Viruses come in different

shapes

Host Specificity

Viruses are very specific on who their host must be.

Larger Host Range

Adino and Rabies

Limited Host Range

Influenza

Viruses can only reproduce if they are in a ____ cell.

host

The viruses ___ with the host cells membrane.

host

when virus ___ is injected, it takes over the function of the host cell.

DNA

If RNA is injected,

the RNA is used for replication and the mRNA is used by the ribosomes to make viral proteins or the RNA and the virus is injected into the cell.

Bacteriophage Replication

Viruses that only infect bacteria.

Lytic Cycle

In the Lytic Cycle, viral replication immediately takes over the host cell. The cell begins to makes and assemble parts for viruses. The cell lyses when its finished.

Lysogenic Cycle

The virus does not immediately take over and kill the host cell and the viral DNA is incorporated into the host cell’s DNA.

An ____ stimulus will cause the viral DNA to detach from the host dna.

enzymatic