The correct sequence of events during bacteriophage infection of a bacterial cell is(A) landing → attachment → tail contraction → penetration and unplugging → DNAejection(B) attachment → landing → penetration and unplugging → tail contraction → DNAejection(C) landing → tail contraction → attachment → DNA ejection → penetration andunplugging(D) attachment → tail contraction → landing → penetration and unplugging → DNAejection

The correct sequence of events during bacteriophage infection of a bacterial cell is (A) landing → attachment → tail contraction → penetration and unplugging → DNA ejection.

Here's the step-by-step process:

1. Landing: The bacteriophage comes into contact with the bacterial cell.
2. Attachment: The bacteriophage attaches itself to the bacterial cell. This is usually done through specific binding between proteins on the bacteriophage and receptors on the bacterial cell.
3. Tail contraction: After attachment, the bacteriophage's tail contracts, which is a mechanism to penetrate the bacterial cell wall.
4. Penetration and unplugging: The bacteriophage injects its DNA into the bacterial cell by penetrating the cell wall. The 'unplugging' refers to the release of the bacteriophage DNA into the bacterial cell.
5. DNA ejection: The bacteriophage's DNA is injected into the bacterial cell, where it will use the cell's machinery to replicate itself.