Biochemistry unit 3 DNP Exam Questions with 100% Correct Answers

Oxidative phosphorylation Correct Answer oxidation-reduction reactions that allow the flow of electrons from NADH and FADH2 to reduce Molecular oxygen to water. The electron flow, which is very exergonic, Takes place in four large protein complexes that are embedded in the inner mitochondrial membrane, together called the respiratory chain or the electron-transport chain. The mitochondrial matrix is the site of the Correct Answer reactions of the citric acid cycle and fatty acid oxidation. Inner mitochondria Correct Answer oxidative phosphorylation takes place in the inner mitochondrial membrane. The inner membrane is intrinsically impermeable Correct Answer A large family of transporters shuttle metabolites such as ATP, pyruvate, And citrate across the inner mitochondrial membrane. Electron-transfer potential Correct Answer In oxidative phosphorylation, the electron-transfer potential of NADH or FADH2 is converted into the phosphoryl-transfer potential of ATP. Measure of phosphoryl-transfer potential Correct Answer The measure of phosphoryl-transfer potential is already familiar to us: it is given by ΔG°′ for the hydrolysis of the phosphoryl compound. The corresponding expression for the electron-transfer potential is E′0, the reduction potential (also Called the redox potential or oxidation-reduction potential). Redox potential Correct Answer couple can be determined by measuring the electromotive force generated by a Sample half-cell connected to a standard reference half-cell. A negative reduction Potential means that the oxidized form of a substance has lower affinity for electrons than does H2. A positive reduction potential means that the oxidized form of a substance has higher affinity for electrons than does H2. Strong reducing agent Correct Answer a strong reducing agent (such as NADH)is poised to donate electrons and has a negative reduction potential, Strong oxidizing agent Correct Answer (such as O2) is ready to accept electrons and has a positive reduction potential.