Discussion
Nutrient agar is prepared by addition of
Answer: B
Correct answer: 3% agar in nutrient broth
Agar is added at about 2-3% to set nutrient broth into a solid plate. Less than that gives a soft or semi-solid medium, used for motility testing; more would make the gel needlessly hard and hard to pour. Agar itself is not a nutrient - almost no bacterium can digest it, which is precisely why it is used as the gelling agent.
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