Question

The transfer by a bacteriophage serving as vector, of a portion of DNA from one bacterium (donor) to another (recipient) is defined as:

• A. Transduction
• B. Transformation
• C. Exposition
• D. Cross transfer

Hint:

Virus (phage) mediated DNA transfer = Transduction T for Transduction → T for Transfer via virus.

Answer 1

The Correct Option is A

Concept:
Genetic material in bacteria can be transferred through three main mechanisms:
• Transformation: Uptake of naked DNA from environment
• Conjugation: Direct transfer via pilus
• Transduction: Transfer via bacteriophage (virus)

Step 1: Understanding bacteriophage role.
A bacteriophage infects bacteria and:
• Injects its DNA into host
• May accidentally package host DNA

Step 2: Transfer mechanism.
When this phage infects another bacterium:
• It transfers donor bacterial DNA

Step 3: Matching definition.
The question clearly mentions:
• Transfer via bacteriophage

Step 4: Evaluating options.

• Transduction → phage-mediated transfer (correct)
• Transformation → naked DNA uptake
• Exposition → not relevant
• Cross transfer → not a standard term

Step 5: Conclusion.
\[ \boxed{\text{Transduction}} \]