Substrate-level phosphorylation (a) occurs through a chemiosmotic mechanism (b) accounts for most of the ATP formed during aerobic cellular respiration (c) occurs during the conversion of pyruvate to acetyl CoA (d) occurs during glycolysis and the citric acid cycle (e) requires high energyelectrons from NADH

Substrate-level phosphorylation (a) occurs through a chemiosmotic mechanism (b) accounts for most of the ATP formed during aerobic cellular respiration (c) occurs during the conversion of pyruvate to acetyl CoA (d) occurs during glycolysis and the citric acid cycle (e) requires high energyelectrons from NADH

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter4: How Cells Obtain Energy

Section: Chapter Questions

Problem 9RQ: What do the electrons added to NAD do? a. They become part of a fermentation pathway. b. They go to...

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What do the electrons added to NAD do? a. They become part of a fermentation pathway. b. They go to another pathway for ATP production. c. They energize the entry of the acetyl group into the citric acid cycle. d. They are converted into NADP.
What is the purpose of respiration? What are the inputs, products, and energy required or gained? How does it differ from fermentation? in other words, how do Glycolysis, Pyruvate dehydrogenase, Kreb cycle, and electron transport chain work and connect to the production of ATP by chemiosmosis? compare that to fermentation.
What is the importance of fermentation to cellular metabolism? a. It generates glucose for the cell in the absence of O2. b. It oxidizes NADH to NAD+ during electron transport. c. It oxidizes NADH to NAD+ in the absence of O2. d. It reduces NADH to NAD+ in the absence of O2.
Which of the following statements is correct? a. Glycolysis and Krebs cycle produce ATP in substrate level phosphorylation b. Glycolysis and Krebs cycle produce ATP in oxidative level phosphorylation. c. Glycolysis and pyruvate oxidation produce ATP in substrate level phosphorylation. d. Glycolysis and pyruvate oxidation produce ATP in oxidative level phosphorylation.
Using your drawing or sketching skills outline the chemiosmotic hypothesis for the mechanism by which oxidative phosphorylation is coupled with electron transport. How does uncoupling occur in tissues with uncoupling protein 1 (UPC1)? Under what circumstances would uncoupling be disadvantageous, and under what circumstances might it be advantageous?
What are NADH and FADH2? a. Oxidized coenzymes which carry electrons b. energy-producing organelles c. short-term, socially popular sources of hydrogen gas d. Reduced coenzymes which carry electrons
Can you help me summarize the outcome of the cellular respiration process in terms of the CO2, NADH, FADH and ATP produces?
Which of the following statements is correct? A) NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle. B) NAD+ has more chemical energy than NADH. C) NAD+ is oxidized by the action of hydrogenases. D) NAD+ can donate electrons for use in oxidative phosphorylation. E) NAD+ is reduced during fermentation in order for glycolysis to continue.
For each molecule of glucose that enters cellular respiration, what would be the combined products of glycolysis, pyruvate oxidation, and the citric acid cycle? A) 4 ATP, 6 CO2, 10 NADH, and 2 FADH2 B) 1 ATP, 2 CO2, 3 NADH, and 1 FADH2 C) 4 ATP, 4 CO2, 6 NADH, and 3 FADH2 D) 2 ATP, 6 CO2 10 NADH, and 2 FADH2
Based on this graph, what does the sudden increase or decrease in ATP, NADH, oxygen and carbon dioxide concentrations mean? How are related these to specific steps in glycolysis and TCA cycle??
Which of the following events occurs during the energy-payoff phase of glycolysis? One carbon of a pyruvate molecule is oxidized to carbon dioxide. Oxaloacetate receives a two-carbon acetyl group from acetyl coenzyme A to form citrate. Substrate-level phosphorylation Oxidative Phosphorylation In which stage of aerobic cellular respiration are FADH2 molecules produced? Pyruvate Oxidation Glycolysis Krebs Cycle Electron Transport Which of the following events does not occur during pyruvate processing (pyruvate oxidation)? One carbon atom of each pyruvate is oxidized to carbon dioxide. NAD+ coenzyme is reduced to NADH. The remaining two carbon atoms of pyruvate (acetyl unit) reacts with coenzyme A to produce acetyl CoA. FAD coenzyme receives two hydrogen atoms to produce FADH2.
Which of the following must be available in sufficient supply for glycolysis to proceed? a. Glucose, NAD+, and ATP b. Pyruvate, NADH, and ATP c. Glucose, NADH, and ATP d. Acetyl-CoA, FAD, and NAD+ e. Pyruvate, NAD+, and ATP