A Large Region of the F Plasmid (~33 Kb)is Called

question 37

Multiple Choice

A large region of the F plasmid (~33 kb) is called the transfer region (tra) and contains about 40 genes necessary for conjugation.The gene traA codes for the protein pilin that is polymerized to form a pilus,using a number of other tra genes.The pilus is a hollow cylinder whose units disassemble once contact is made in order to "reel in" the recipient cell.What other functions of the tra genes are required for transfer?

• A)DNA unwinding,and restriction of contact with F⁺ cells
• B)DNA replication enzymes
• C)resistance to phage infection
• D)integration of F genes into the recipient's chromosome
• E)integration of F genes into the recipient's plasmid

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