What is the formula used to calculate transformation efficiency? (include units)

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Multiple Choice

What is the formula used to calculate transformation efficiency? (include units)

Explanation:
Transformation efficiency measures how many cells successfully take up and express the introduced DNA, usually expressed as colonies per microgram of DNA used. The best formula is the total number of colonies (CFU) divided by the amount of DNA spread on the plate (μg), giving units of CFU/μg. This expresses efficiency as a rate: more colonies per microgram means higher efficiency. The other options either multiply by the DNA amount, which would not represent a per‑microgram rate, invert the relationship, or include plate area, which doesn’t reflect how much DNA was used to achieve those colonies.

Transformation efficiency measures how many cells successfully take up and express the introduced DNA, usually expressed as colonies per microgram of DNA used. The best formula is the total number of colonies (CFU) divided by the amount of DNA spread on the plate (μg), giving units of CFU/μg. This expresses efficiency as a rate: more colonies per microgram means higher efficiency. The other options either multiply by the DNA amount, which would not represent a per‑microgram rate, invert the relationship, or include plate area, which doesn’t reflect how much DNA was used to achieve those colonies.

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