Which of the following statements correctly describes F- cells and F+ cells?

Question

BlackTom AI · Accepted Answer

Topic: F- and F+ cells in bacterial conjugation. This question asks which statement accurately describes the roles of F+ and F- cells during conjugation.
Option 1: 'F+ cells function as DNA recipients during conjugation and F- cells function as DNA donors during conjugation.' This reverses the established roles: F+ cells are the donors that transfer the F plasmid, while F- cells typically act as recipients; thus, this option is inaccurate.
Option 2: 'Neither types of cells can donate F plasmids to other cells.' This is incorrect because the defining feature of F+ cells is their ability to donate the F plasmid to F- cells during conjugation, a fundamental mechanism in bacterial genetics.
Option 3: 'F+ cells function as DNA donors during conjugation and F- cells function as DNA recipients during conjugation.' This aligns with the classic model of conjugation: the F+ donor transfers the F plasmid to an F- recipient, enabling both genetic exchange and potential conversion of the recipient to a donor if the F plasmid integrates. The terminology 'donor' and 'recipient' here is standard and reflects the directional transfer.
Option 4: 'Both types of cells can donate F plasmids to other cells.' This is incorrect because F- cells lack the F plasmid and therefore do not donate F plasmids under normal conjugation conditions; only F+ cells initiate and mediate the transfer.
In summary, the key distinctions are about donor versus recipient roles, and the presence of the F plasmid in F+ cells enabling transfer. The other options misstate these roles or the capacity for transfer, leading to their inaccuracy.

Which of the following statements correctly describes F- cells and F+ cells? 单项选择题

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