WAYS DNA IS TRANSFERRED IN BACTERIA

WAYS DNA IS TRANSFERRED IN BACTERIA - WAYS DNA IS...

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WAYS DNA IS TRANSFERRED IN BACTERIA    2. Conjugation---this is another method for transferring DNA from one bacterium to another.  Conjugation requires a special plasmid (a plasmid is a circular piece of DNA which some  bacteria contain in addition to the bacterial chromosome). The genes carried by plasmids may  influence the characteristics of the cell, but usually are not necessary for growth of the cell under  normal conditions.    Conjugation requires cell-to-cell contact. The conjugating cells must be of opposite mating types. Donor cells carry the plasmid and recipient cells do not. In gram-negative bacteria, the plasmid carries genes that code for the synthesis of sex pili, which are projections from the donor cell’s surface that attach to the recipient and help bring the two cells together. Gram-positive cells produce sticky surface molecules that stick the conjugating cells together.
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