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6. Which of the following when used in proper concentration stimulates the Ascomycetes fermentation of vitamin B₁₂and can be used to counteract the toxicity of iron in Candida species?

A. Co
B. Ni
C. Zn
D. Ca

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7. Pectinase, an enzyme used for increasing yield and for clarifying juice is obtained by

A. A. oryzae
B. A. niger
C. A.flavus
D. all of these

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8. The 95% ethanol is equivalent to

A. 190 proof
B. 110 proof
C. 170 proof
D. 120 proof

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9. Which species from the following is resistant to methyl tryptophan?

A. Candida utilis
B. E. coli
C. B. subtilis
D. Hansenula anomala

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10. Which of the following substance is employed to neutralize the lactic acid as it is produced (because lactic acid bacteria do not tolerate high concentrations of acid?

A. CaCO₃
B. (NH₄)₂HPO₄
C. MgSO₄
D. Na₂SO₄

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