1. Which of the following best describes the role of catabolite repression in microbial metabolism?Question 1Answera.Prevents the synthesis of enzymes for secondary carbon sources when a preferred source is availableb.Increases the production of secondary metabolitesc.Promotes the use of less preferred carbon sourcesd.Activates the regulatory genes for enzyme production

Regulatory mechanisms in metabolic pathways do which of the following?Group of answer choicesA) allow for pathways like amino acid synthesis and amino acid catabolism to occur at the same time to the same degreeB) allow an organism to use the right fuel at the right timeC) use one or two methods to regulate enzymes to control the flux through a given metabolic pathwayD) ensure there are more end products of biosynthetic pathways than neededE) all of the above

Catabolite repression in E. coli primarily demonstrates how:Question 3Answera.The presence of glucose enhances the utilization of lactose.b.Lactose can increase the cAMP levels in the cell.c.Glucose presence inhibits lactose metabolism.d.Glucose and lactose are metabolized simultaneously.

What is the significance of catabolite repression in the production of penicillin?Question 15Answera.It has no impact on penicillin productionb.It increases the variety of metabolites producedc.It inhibits penicillin production in glucose-containing mediumd.It enhances penicillin production in the presence of glucose

Besides the lac operon, which other operons are subject to catabolite repression?Select your answer:Select your answerOPTION ALTERNATIVE Those involved in DNA replication. Those involved in protein degradation. Those involved in catabolism. Those involved in lipid synthesis.

Which of the following statements are true of enzymes?SELECT ALL THAT APPLYEnzymes are permanently changed in a reaction.Enzymes are involved in catabolism but not in anabolism.Enzymes produce specific products from specific substrates.Enzymes provide a route from reactants to products that has a lower activation energy.Enzymes can be regulated to control cellular metabolism.All enzymes require cofactors for activity.