Chapter 19: Bacteria and Viruses Notes

19-1 Prokaryotes

Classifying Prokaryotes

Domains are a classification above kingdom

Identifying Prokaryotes




Obtaining Energy

Growth and Reproduction

·        Binary fission is asexual reproduction where the bacteria just divide into identical cells.

·        Conjugation: Bacteria make a gridge and exchange genetic material

·        Transformation: Bacteria incorporate DNA from dead bacteria

·        Transduction: use viruses to transfer DNA from bacteria to other bacteria.

19-2 Bacteria in Nature


Nitrogen fixers:

Bacteria and disease:

Pathogens (disease causing agent)

Human Uses of Bacteria

 Controlling Bacteria


19-3 Viruses


Lytic cycle- virus enters the cell, make copies of itself and causes the cell to burst.



















Lysogenic cycle- a virus imbeds its DNA into the DNA or the host cell and is replicated along with the host cell’s DNA.  Bacterial DNA called prophage.




















Virus and Disease