The sex factor in bacteria is .......

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(B) In bacteria,the sex factor is known as the $F$-factor or $F$-plasmid (Fertility factor).This plasmid contains the genes necessary for the formatio

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$F$-plasmid

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(B) In bacteria,the sex factor is known as the $F$-factor or $F$-plasmid (Fertility factor).This plasmid contains the genes necessary for the formation of the sex pilus,which is required for the process of conjugation.During conjugation,the $F$-plasmid is transferred from the donor cell $(F^+)$ to the recipient cell $(F^-)$,thereby converting the recipient into a donor cell.Therefore,the correct option is $B$.

$(1)$ Gram-positive bacteria	$(a)$ Thermoacidophiles
$(2)$ Bacteria living in acidic medium	$(b)$ Firmicutes
$(3)$ Gram-negative bacteria	$(c)$ Halophiles
$(4)$ Bacteria living in extreme salty conditions	$(d)$ Spirochetes

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Select the correct option for the following matches:
$(1)$ Gram-positive bacteria $(a)$ Thermoacidophiles
$(2)$ Bacteria living in acidic medium $(b)$ Firmicutes
$(3)$ Gram-negative bacteria $(c)$ Halophiles
$(4)$ Bacteria living in extreme salty conditions $(d)$ Spirochetes

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