BIOD171 ESSENTIALS IN MICROBIOLOGY MODULE 2 MICROBIAL METABOLISM FINAL EXAM REVIEW Q

BIO D171 MICROBIOLOGY Module 2 Final Exam Review Q & A 2024 1. Which of the following is a primary function of microbial metabolism? A) Energy storage B) Cellular repair C) Pathogenicity D) Energy production Answer: D) Energy production Rationale: Microbial metabolism primarily involves biochemical processes that convert nutrients into energy and new cellular materials, which is essential for microbial growth and re production. 2. In the context of enzymatic reactions, what does the term 'substrate' refer to? A) The enzyme's active site B) The product of the reaction C) The molecule upon which an enzyme acts D) The energy required to initiate the reaction Answer: C) The molecule upon which an enzyme acts Rationale: A substrate is the specific reactant molecule that an enzyme binds to and acts upon during a biochemical reaction. 3. What is the role of coenzymes in microbial enzymatic reactions? A) They provide structural support to enzymes. B) They act as electron carriers in redox reactions. C) They increase the temperature for optimal enzyme activity. D) They decrease the pH for optimal enzyme activity. Answer: B) They act as electron carriers in redox reactio ns. Rationale: Coenzymes are non -protein organic molecules that bind to enzymes and assist in enzyme -mediated reactions, often by acting as carriers of electrons or specific atoms or functional groups. 4. Which of the following best describes the 'induced fit' model of enzyme activity? A) The enzyme is rigid and the substrate must fit perfectly. B) The enzyme and substrate undergo conformational changes to interact. C) The enzyme is permanently altered by the substrate. D) The substrate is degraded before binding to the enzyme. Answer: B) The enzyme and substrate undergo conformational changes to interact. Rationale: The 'induced fit' model suggests that the enzyme's active site undergoes a conformational change when the substrate binds, enhancing the catal ytic activity of the enzyme. 5. What is the effect of competitive inhibitors on enzymatic activity? A) They increase the rate of the reaction. B) They bind to the active site, preventing substrate binding. C) They bind to a site other than the active site , changing the enzyme's shape. D) They have no effect on the reaction. Answer: B) They bind to the active site, preventing substrate binding. Rationale: Competitive inhibitors compete with the substrate for the active site of the enzyme, which can decrease the rate of the reaction if the concentration of the substrate is not high enough to overcome the inhibition. 6. Which type of metabolic pathway involves the breakdown of complex molecules into simpler ones with the release of energy? A) Anabolic pathway B) Catabolic pathway C) Amphibolic pathway D) Metabolic channeling Answer: B) Catabolic pathway Rationale: Catabolic pathways involve the degradation of complex molecules into simpler ones, releasing energy that can be harnessed by the cell for various activities. 7. What is the main purpose of fermentation in the context of microbial metabolism? A) To produce oxygen B) To generate ATP in the absence of oxygen C) To consume excess ATP D) To produce light Answer: B) To generate ATP in the absence of oxyg en Rationale: Fermentation is a metabolic process that allows cells to produce ATP without the need for oxygen, which is particularly important for anaerobic organisms or under anaerobic conditions.