F09 Bio1010 Exam Microbiology

A the products of the reaction block the active site

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Unformatted text preview: s. 4. In the above figure, which curve represents the behaviour of an enzyme taken from a bacterium that lives in hot springs at 70°C  ­ 80°C? A. B. C. D. E. curve 1 curve 2 curve 3. Both curve 1 and 2. Both curve 2 and 3. 3 5. Which of the following best describes the process of competitive feedback inhibition? A. The products of the reaction block the active site of the enzyme. B. The products of the reaction bind to a site other than the active site of the enzyme and block enzyme activity indirectly. C. The substrate and cofactors compete with one another for the active site. D. The inhibitor binds to the substrates of the reaction. 6. Which of the following statements about ATP synthesis in bacteria and archaea is true? A. B. C. D. They oxidize NADH on the plasma membrane. They are unable to use oxygen. They do not make ATP. Most ATP is produced in their mitochondria. 7. Where, in the eukaryotic cell, does glycolysis take place? A. B. C. D. E. inner membrane of mitochondria. intermembrane compartment of mitochondria. mitochondrial matrix. cytoplasm. plasma membrane. 8. During cellular respiration, the carbons present in pyruvate initially derive from _____ and are ultimately converted to _____. A. B. C. D. NAD+; ATP Acetyl CoA; CO2 Glucose; CO2 Glucose; ATP 9. Glycolysis is regulated in response to the amount of ATP in the cell. Specifically, high levels of ATP regulate the activity of phosphofructokinase, a key enzyme in glycolysis. How does this regulation occur? A. ATP binds to the enzyme’s active site, increasing enzyme activity. B. ATP inhibits the synthesis of new enzyme molecules. C. ATP binds to the enzyme’s regulatory site, resulting in a conformational change that inhibits enzyme activity. D. ATP activates the production of new enzyme molecules. 4 10. Many anaerobic organisms, when under conditions of oxygen deprivation, will carry out A. B. C. D. E. glycolysis and fermentation. glycolysis and the Krebs cycle. the Krebs cycle only. glycolysis only. fermentation only. Fermentation alone isn’t of much use – the reactions allow glycolysis to continue, generating more ATP. Fig. 2. The absorption spectrum for chlorophyll a and the action spectrum for photosynthesis in Mysterius plantus. 11. Please consult Figure 2. Of the...
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