GENERAL HISTOLOGY

EPITHELIUM

CILIA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The direct transfer of DNA when two cells are connected temporarily is done by:
A
meiosis
B
transferring the genes through the connection of the cells’ flagella
C
active transport
D
conjugation through the pili of the two cells.
Explanation: 

Detailed explanation-1: -Conjugation. In conjugation, DNA is transferred from one bacterium to another. After the donor cell pulls itself close to the recipient using a structure called a pilus, DNA is transferred between cells. In most cases, this DNA is in the form of a plasmid.

Detailed explanation-2: -Conjugation is a gene transfer process in which a recipient bacterium receives DNA from a donor bacterium by cell-to-cell contact through conjugative pili. Conjugation is mediated by certain plasmids or transposons.

Detailed explanation-3: -We conclude that F pili play at least three roles in mating: (i) they initiate contacts between mating pairs; (ii) they facilitate the transfer of genetic material; and (iii) they draw mating cells into a close contact which increases the fertility of the union.

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