suppose a bacterial strain mentioned as F+.what does it mean?
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The bacterium is F+, and is the donor. (That is correct.) The bacterium is F+, but can no longer be a donor. (No, the F factor is present, so the bacterium can make pili and be a donor.) The bacterium is F+, but is now the recipient.
pronitanath8:
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The bacterium F+ has denotes as the recipient which has F factors and it is integrated to provide with the bacterial chromosome. This can still provide donor and it acts in a conjugation cross. These could easily integrate with strains that are called Hfr and it is due to high frequency of recombination. It easily occurs when mated with F bacteria.
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