The usual concentration of agar used in agar medium is___________________?
Correct answer: B. 2%
- A. 10%
- B. 2%
- C. 5%
- D. 15%
Explanation
Agar is usually used at about 1.5% to 2% to solidify culture media while still permitting diffusion of nutrients and growth of colonies. Concentrations such as 5% or more are unnecessarily firm for routine agar media.
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