Question

as you have seen, bacteria can acquire new dna via conjugation, transformation and transduction. which bacterial dna molecule is affected by each of these processes?
a) all processes can change both chromosomal and plasmid dna
b) transformation adds plasmid dna, transduction and conjugation change chromosomal dna
c) transduction adds plasmid dna, transformation and conjugation change chromosomal dna
d) conjugation adds plasmid dna, transduction and transformation change chromosomal dna

Explanation:

To solve this, we analyze each process:

• Conjugation: Often involves plasmid transfer (e.g., F - plasmids), but can also transfer chromosomal DNA in some cases.
• Transformation: Bacteria take up free DNA (can be plasmid or chromosomal fragments from the environment).
• Transduction: Bacteriophages transfer DNA (can be plasmid or chromosomal, depending on the phage and host).

Thus, all three processes (conjugation, transformation, transduction) can affect both chromosomal and plasmid DNA. Option a) aligns with this, while options b, c, d incorrectly restrict the DNA types affected by each process.

Answer:

a) All processes can change both chromosomal and plasmid DNA