How Are Hfr Strains of Bacteria Different from F⁺ Strains

question 34

Multiple Choice

How are Hfr strains of bacteria different from F⁺ strains?

• A) Cells of F⁺ strains are able to transfer chromosomal genes, whereas cells of Hfr strains cannot.
• B) Cells of Hfr strains cannot initiate conjugation with F^- cells.
• C) The F factor is integrated into the bacterial chromosome in all or most cells of an Hfr strain but in only a few cells in an F⁺ strain.
• D) Cells of Hfr strains carry F´ plasmids, whereas F⁺ cells do not.
• E) Cells of Hfr strains can initiate conjugation with F⁺ cells or other Hfr cells.

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