Q5. (a) What is catabolite repression? What will happen to the metabolism of bacteria if a mixture of three sugars Glucose, Sucrose and Fructose are provided? State the order at which the sugars will be metabolized by the bacteria. (b) Following Figure shows the effect of catabolite repression in presence of two sugars Glucose and Lactose. How will the substrate consumption and biomass growth curve will change on the introduction of following sugars as a third additive. Explain it with appropriate reasons. (i) Glucose and (ii) Cellulose Growth on lactose Lactose Glucose used up Glucose Growth on glucose B-Galactosidase induced 2 8 Time, hours Number of bacteria Sugar concentration

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