NEET BIOLOGY

Detailed explanation-1: -The F+ cell possesses a circular plasmid containing the gene called as the sex factor. This sex factor is responsible for the growth of F-pili which is involved in the process of conjugation where the lateral transfer of genes takes place. The replicon is the whole chromosome.

Detailed explanation-2: -Sex factor of bacteria is F-factor or fertility factor. It is present in its plasmid. F-factor contains genes for producing sex pili and other characters needed for gene transfer. It has a molecular mass of about 250, 000 daltons.

Detailed explanation-3: -The donor bacterium carries a DNA sequence called the fertility factor, or F-factor. The F-factor allows the donor to produce a thin, tubelike structure called a pilus, which the donor uses to contact the recipient.

Detailed explanation-4: -The fertility or F factor is a defining characteristic of F-plasmids. Due to its role in the genetic material transfer from one bacteria to another, it is also known as the “sex factor.” The F factor is primarily present in bacteria, and the exchange occurs during conjugation.

Detailed explanation-5: -A high-frequency recombination cell (Hfr cell) (also called an Hfr strain) is a bacterium with a conjugative plasmid (for example, the F-factor) integrated into its chromosomal DNA. The integration of the plasmid into the cell’s chromosome is through homologous recombination.