genChap5a - Chapter 5(Draft Gene transfer in bacteria and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 5  (Draft) Gene transfer in bacteria and their viruses. Viruses are not cells. They cannot grow or multiply on their own. Prototrophs can grow on minimal medium?  Composition? Pp208-209. Auxotrophs cannot grow on minimal medium.  Why not? The F plasmid and bacterial conjugation. F plasmid has the loci to allow a bacteria to grow a pilus ( pili, plural.) Pilus is a cytoplasmic extension.   It can contact another bacterial cell and pull the bacteria closer together. DNA can then travel from the pilus into the cell without the F plasmid. It is a one-way transfer. F plasmid may be not integrated into bacterial chromosome. Cell called an F + cell.   In this state a copy of the F plasmid will transfer easily from the F + or male cell  into the F – or female cell. Thus, F + cells can convert many other cells into F+. If the F plasmid is integrated into the bacterial c’some the cell is called an Hfr  cell.   Hfr stands for High frequency of recombination. The integrated F plasmid can break within the integrated region and cause the  movement of a copy of the bacterial c’some in this cell through the pilus into the 
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/06/2008 for the course BIO 325 taught by Professor Saxena during the Spring '08 term at University of Texas.

Page1 / 4

genChap5a - Chapter 5(Draft Gene transfer in bacteria and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online