2. The Fusion of cell membranes and transfer of single strand of plasmid DNA of donor cell.
Explanation:
When one bacterium transfers its genetic material through direct contact to others. The bacterium transfers its genetic material called <u>donor cell</u> and one serves it called <u>recipient cell.</u>
There are mainly four steps in this process-
1. Connecting sex pilus to recipient cell by donor cell.
2. The Fusion of cell membranes and transfer of single strand of DNA to the recipient cell.
3. Each bacterium cell makes a complementary DNA strand.
The exceptions to this rule are the pulmonary arteries and veins. <span> The pulmonary artery is the one that carries deoxygenated blood from the right side of the heart (ventricle) to the lungs. On the other side, pulmonary veins transfer oxygenated blood from the lungs to the heart (left atrium).</span>