Bacteriology 2 Views 1 Answers
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Sourav PanDecember 7, 2024

Which of the following statements about conjugation is true? A Transferring DNA between cells in conjugation requires a virus carrier. B The donor and recipient cell must be in direct contact (touching) to transfer DNA. C Conjugation can only occur between bacteria of the same species. D Conjugation can occur with or without a conjugative plasmid.

Which of the following statements about conjugation is true? A Transferring DNA between cells in conjugation requires a virus carrier. B The donor and recipient cell must be in direct contact (touching) to transfer DNA. C Conjugation can only occur between bacteria of the same species. D Conjugation can occur with or without a conjugative plasmid.

Sourav Pan
Sourav PanDecember 7, 2024

Answered

The correct answer is B) The donor and recipient cell must be in direct contact (touching) to transfer DNA.

Here’s an explanation of each option:

  • A) Transferring DNA between cells in conjugation requires a virus carrier: This is false. Conjugation does not require a virus (or bacteriophage). It is a direct DNA transfer process between bacterial cells, often facilitated by a pilus, and does not involve viral mediation. This option describes transduction, not conjugation.
  • B) The donor and recipient cell must be in direct contact (touching) to transfer DNA: This is true. In bacterial conjugation, the donor and recipient cells physically connect through a pilus, which facilitates the transfer of DNA, typically plasmid DNA, from the donor to the recipient cell.
  • C) Conjugation can only occur between bacteria of the same species: This is false. Conjugation can occur between bacteria of different species, as long as they have the necessary machinery for conjugation (e.g., a conjugative plasmid or compatible mating systems). For example, certain plasmids can enable conjugation between species.
  • D) Conjugation can occur with or without a conjugative plasmid: This is false. Conjugation typically involves a conjugative plasmid that carries the necessary genes for pilus formation and DNA transfer. While some forms of conjugation can transfer chromosomal DNA, a conjugative plasmid is essential for initiating the process.

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