Choose the event below that does not occur during bacterial conjugation. Multiple Choice The recipient cell becomes a donor cell after conjugation. Enzymes cleave one strand of the DNA at the origin of transfer. Transfer of the DNA strands occurs in both directions. Shortening of the pilus occurs during conjugation. Direct contact between is made between donor and recipient cells.
Choose the event below that does not occur during bacterial conjugation. Multiple Choice The recipient cell becomes a donor cell after conjugation. Enzymes cleave one strand of the DNA at the origin of transfer. Transfer of the DNA strands occurs in both directions. Shortening of the pilus occurs during conjugation. Direct contact between is made between donor and recipient cells.
Answered
The correct answer is Transfer of the DNA strands occurs in both directions.
During bacterial conjugation, DNA transfer occurs in one direction, from the donor cell to the recipient cell. The donor cell transfers a single strand of its DNA (often a plasmid) to the recipient cell, where it is replicated to form a complete DNA molecule.
Here’s why the other options are correct:
- The recipient cell becomes a donor cell after conjugation: After receiving the DNA, the recipient may acquire the necessary plasmid or genes to become a donor in future conjugation events.
- Enzymes cleave one strand of the DNA at the origin of transfer: This is the first step in conjugation, where a nuclease enzyme makes a nick in the donor DNA, allowing transfer to begin.
- Shortening of the pilus occurs during conjugation: After the donor and recipient cells are connected via the pilus, the pilus contracts, bringing the cells closer together for DNA transfer.
- Direct contact between is made between donor and recipient cells: This is a critical feature of conjugation, as the physical connection between cells is necessary for the transfer process.
BNO Team