Describe: bacterial genome

b.stev

REPLICATES before cell division:two daughter cells attached>interior of cell

membrane membrane elongates, chromosomes move apart cell doubles in size: chromosomes separate the cell THEN “pinches”pinches” inwards... a new cell wall forms that separates the two new cells and their chromosomal replicas

most of the hereditary material: single long circular molecule, DNA - a variety of proteins associated

this molecule is the cell’s chromosome

(Barnes S. N, Curtis H, 1989)

cell wall

chromosome

cell membrane

theta replication

growth of cell

NEXT

REPLICATION

new cell wall forms

REPLICATED bacterial

cells

(two identical daughter

cells)

This type of replication is known as:

THETA REPLICATION

a bi-directional motion

DNA helix

unwinds/ replicates/ rewinds

cell F-cell F+

bacterial chromosome

F plasmid

bacteria join: pili

transfer of F plasmid

cell F+

transfer provides: COMPLEMENTARY DNA

CONJUGATION

PLASMIDS are small pockets of DNA that occur in bacteria carry genetic material for a specific purpose plasmids often conjugate to another bacterium

THIS:provides the bacterium with complementary DNA

KNOWN AS,”rolling circle replication”

plasmid moves to bacterium via the use of an extension made by host [carrier] cell:

- this extension is called: pili

(Barnes S. N, Curtis H, 1989)

Bibliography

Barnes S. N, Curtis H. (1989). Biology (5th ed.). New York: Worth

Wikipedia. (2008). Bacterial conjugation – wikipedia, the free encyclopedia. Retrieved October 23, 2008, from en.wikipedia.org/wiki/Bacterial _conjugation - 41k -

The basics – replication. (n.d). Retrieved October 23, 2008, from http//:www. socrates.acadiau.ca/courses/biol/microbiology/Replication.htm - 9k -