Describe - Bacterial Genome

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” 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 -