Transfer of a poion of DNA from one bacterium to another by the bacteriophage is known as –
**Core Concept**
The question is testing the understanding of the process of genetic transfer between bacteria facilitated by bacteriophages, which are viruses that infect bacteria. This concept is crucial in the field of molecular biology and genetics.
**Why the Correct Answer is Right**
The correct answer is based on the process of generalized transduction, where a bacteriophage (phage) randomly picks up bacterial DNA from the host bacterium during its lytic cycle. When the phage infects another bacterium, it can transfer this DNA to the new host, thereby transferring genetic material between bacteria. This process is a type of horizontal gene transfer, which is distinct from transformation and conjugation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the involvement of a bacteriophage in the transfer of DNA between bacteria. While transformation and conjugation are both mechanisms of horizontal gene transfer, they do not involve bacteriophages.
**Option B:** This option is incorrect because it refers to the process of conjugation, where DNA is transferred directly between two bacterial cells through a specialized structure called a conjugation pilus.
**Option C:** This option is incorrect because it refers to the process of transformation, where free DNA molecules are taken up by a bacterial cell from its surroundings.
**Option D:** This option is incorrect because it is a distractor and does not refer to any known mechanism of genetic transfer between bacteria.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that generalized transduction can result in the transfer of not only beneficial genes but also virulence factors, antibiotic resistance genes, and other genetic elements that can significantly impact bacterial populations.
**Correct Answer: B. Conjugation.**