Bio 172 Exam 2 Questions and Answers 100% Pass

Bio 172 Exam 2 Questions and Answers 100% Pass **Describe three ways energy is extracted from glucose.** **Ways:** - Glycolysis - Citric Acid Cycle (Krebs Cycle) - Oxidative Phosphorylation **Identify the enzyme responsible for consuming ATP in the investment phase of glycolysis.** **Enzyme:** Phosphofructokinase **How many binding sites does phosphofructokinase have, and what binds there?** **Binding Sites:** It has both regulatory and active sites. - **Binding:** ATP binds to both regulatory and active sites. **What effect does ATP binding at phosphofructokinase's regulatory site have on the reaction rate?** **Effect:** It decreases the reaction rate; ATP inhibits phosphofructokinase. **Define feedback inhibition.** **Definition:** It occurs when the product of a series of reactions inhibits an earlier enzyme in the pathway allosterically. **Describe Phase 1 of glycolysis.** **Phase 1:** Known as the energy investment phase. It consumes two ATP molecules, and its product is fructose-1,6-bisphosphate. **Explain Phase 2 of glycolysis.** **Phase 2:** Referred to as the cleavage phase. Fructose-1,6-bisphosphate is cleaved into two molecules of glyceraldehyde-3-phosphate. No ATP is consumed in this phase. **Outline Phase 3 of glycolysis.** **Phase 3:** Known as the payoff phase. It produces 2 NADH molecules and 4 ATP molecules. Pyruvate is the final product. **List the net products of glycolysis.** **Net Products:** - 2 Pyruvate molecules