Question:
By which method is foreign DNA introduced into a cell by a virus or viral vector?
By which method is foreign DNA introduced into a cell by a virus or viral vector?
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Virus-mediated DNA transfer = transduction; naked DNA uptake = transformation.
Updated On: Jun 24, 2026
- Transduction
- Transcription
- Lysogenic conversion
- Transformation
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The Correct Option is A
Solution and Explanation
Step 1: Transduction is the transfer of DNA from one cell to another by a virus or viral vector (a bacteriophage carrying bacterial DNA between bacteria), which exactly matches the stem, making option a correct.
Step 2: Transcription (option b) is the synthesis of RNA from a DNA template - it is gene expression, not gene transfer, so it is wrong.
Step 3: Lysogenic conversion (option c) is a change in the phenotype of a bacterium caused by a prophage (for example toxin production), but it describes a consequence of integration, not the general mechanism of introducing foreign DNA via a vector.
Step 4: Transformation (option d) is uptake of free/naked DNA directly from the environment without any viral vector, so it is excluded.
Step 2: Transcription (option b) is the synthesis of RNA from a DNA template - it is gene expression, not gene transfer, so it is wrong.
Step 3: Lysogenic conversion (option c) is a change in the phenotype of a bacterium caused by a prophage (for example toxin production), but it describes a consequence of integration, not the general mechanism of introducing foreign DNA via a vector.
Step 4: Transformation (option d) is uptake of free/naked DNA directly from the environment without any viral vector, so it is excluded.
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