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What is the most important practical quality of a competent host?

Answer and explanation

Correct answer: High viability and DNA uptake ability

The direct answer is A: high viability and DNA uptake ability are the most important practical qualities. A competent host must remain alive and healthy enough to grow after treatment, and it must be able to take up external DNA. Viability matters because dead or severely damaged cells cannot recover, express genes, or form colonies. DNA uptake ability matters because a healthy cell that cannot receive plasmid DNA will not become transformed. Good competence therefore combines survival with efficient uptake; later selection can then identify cells carrying the desired plasmid. Option A includes both essential properties. Option B, strong smell, has no useful relationship with transformation. Option C, bright colour, does not prove DNA uptake or survival. Option D is opposite to the requirement: cells need growth ability, not its absence. Remember: competent means alive, recoverable, and able to take DNA.

Related tags

ViabilityDna UptakeCompetent Host

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