Question

Q7-10. Summarize the effects of yeast concentrations on the fermentation rate. (p. 9) Q7-11. Summarize the effects of substrate concentrations on the fermentation rate. (p. 10) Q7-12. Summarize the effects of substrate types on the fermentation rate. (p. 11) Q7-17. Summarize the effects of the inhibitors and enhancers on the fermentation rate. (p. 14)

Answer 1

Q 7. 10

Ans: Yeast concentration effects the rate of fermentation due to presence of enzyme in the yeast cell. If the yeast concentration (g/L) increases then the rate of fermentation will increase till an optimum is reached”. If the yeast concentration decrease then rate of fermentation also decrease.

Q.7.11.

Ans: If the substrate concentration is high (the number of substrate molecules is abundant), then the rate of fermentation increase because the more enzymes (present in yeast cell) come into contact with substrate molecules.

If the substrate concentration is low, (the number of substratemolecules is less) then the rate of fermentation decreases

Q.7.12

Ans: If the substrate is fructose, rate of fermentation is highest followed by glucose as the substrate, and by sucrose as the substrate.

So we can say simpler the sugar (substrate), the higher the rate of fermentation of yeast.

Q.7 14

Ans: Inhibitor always inhibit (or decrease) the rate of fermentation and enhancer always increase the rate of fermentation