from the graph it is clear that NADH shows absorbance at 340 nm.
monitoring a reaction catalyzed by an NAD-dependent enzyme, a biochemist noticed that the peak of absorbance at 340nm gradually increases. is this reaction procesding towards the formation of NAD+ or NADH? QUESTION 20 Monitoring a reaction catalyzed by an NAD-dependent enzyme, a biochemist notices that the peak of absorbance at 340 nm gradually increases. Is the reaction proceeding towards the formation of NAD+ or NADH?
1. Which one of the following shows the correct sequence of energy transitions during chemiosmosis? A. NADH → electron acceptors → proton gradient → ATP synthase → ATP B. NADH → NAD+ → FADH2 → electron acceptors → ATP C. carbohydrates → acetyl CoA → CO2 → proton gradient → ATP D. NAD+ → NADH → protons → ADP → ATP E. glucose → pyruvate → acetyl CoA → NADH → ATP 2. Facultative anaerobes: A. prefer carbon dioxide. B....
identify all enzymes and their reactions which are affected by [NAD+]/[NADH] levels. Identify the reaction by the name of the enzyme and whether the enzyme, and therefore its reaction, is stimulated or inhibited by a low [NAD+]/[NADH] ratio.
Which of the following statements are false regarding NAD+ and NADH? 1.) in a typical biological oxidation reaction, hydride from alcohol is transferred to NADH giving NAD+. 2.) these are commonly called pyridine nucleotides 3.) they dissociate from the enzyme after the reaction 4.) none of the answers are correct
Given the roles of NAD+ NADH in oxidation reactions and NADPH- NADP+ reduction reactions, discuss which cofactor is more commonly used in catabolic pathways and which one is in anabolic pathways? What do you expect the intracellular ratios of NAD+/NADH and NADP+/NADPH to be high or low under homeostasis? Explain your answers. Explain the benefits of the Q cycle comparing to direct transfer of electrons from QH2 to two cytochrome c Distinguish substrate-level phosphorylation and oxidative phosphorylation. Provide specific examples...
What is NAD (NAD+) and NADH? Describe them as if you were a chemist. Why is NAD needed by all cells no matter what type of metabolism they use?
Suppose NAD+ is unavailable because NADH cannot be oxidized due to a mutation in the NADH dehydrogenase (Complex I). If FAD could substitute for all NAD+, how would this affect the total ATP produced by the complete oxidation of glucose? How would it affect the total ATP produced by the complete oxidation of a 20C fatty acid? (Give specific numbers and show how you reached this number.) Based on what you know about redox potentials, would this be possible?
Which of the following reduces NAD+ to NADH? *photosystem I *glycolysis *fermentation *oxidative phosphorylation *citric acid cycle *Calvin cycle
We have discussed fermentation as a mechanism for regeneration of NAD for glycolysis under conditions when an ETC is not available for NAD regeneration. Embden-Meyerhof glycolysis converts one NAD to NADH for each molecule of pyruvate produced. Fermentation of pyruvate to propionic acid converts one NADH to NAD for each molecule of pyruvate fermented. Which of the following statements is TRUE of metabolism under conditions that force the use of pyruvate fermentation to propionate? It should be possible to perform...
Show how NADH is recycled to NAD+ under anaerobic conditions. Why is it important to recycle NADH produced during glycolysis to NAD+?