Concept explainers
Interpretation: To determine the relationship between cytosolic NADH and the
Concept introduction: In the glycolysis metabolic pathway, a glucose molecule breaks down into two pyruvate molecules. ATP and NADH are produced along with pyruvate. The net overall equation for the glycolysis process is as follows:
Electron transfer chain is defined as a series of biochemical reactions in which the electrons and hydrogen ions
Flavin adenine dinucleotide exists in two forms: oxidized form denoted as FAD and reduced form denoted as
Nicotinamide adenine dinucleotide is associated with the redox reactions in metabolism. Its reduced form is NADH and oxidized form is
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- The malate–aspartate shuttle yields about2.5 moles of ATP for each mole of cytosolic NADH. Why doesnature use the glycerol–phosphate shuttle, which yields only about1.5 moles of ATP?arrow_forwardIn which of the following metabolic conversions is ATP “generated” during glycolysis? Glucose —> Glucose-6-phosphate 1,3-Bisphosphoglycerate —> 3-Phosphoglycerate Fructose-1,6-bisphosphate —> Dihydroxyacetone phosphate + Glyceraldehyde-3-phosphate Glucose-6-phosphate —> Fructose-6-phosphate 2-Phosphoglycerate —> 3-Phosphoglyceratearrow_forwardWhat is the name of the by-product of anaerobic glycolysis that can lead to muscle fatigue and why does this by-product cause muscle fatigue?arrow_forward
- If α-ketoglutarate is removed from TCA cycle and used to make glutamate, how many of each of the cofactors (not intermediates) and high energy molecules in the TCA cycle are lost? How much ATP does this equate to (NADH = 2.5 ATP, FADH2 = 1.5 ATP)?arrow_forwardHow many ATP equivalents would be generated or used by the metabolism of 2 oxaloacetate to glucose?arrow_forwardAssuming that the glycerol 3-phosphate shuttle is operative, a complete oxidation of three molecules of glucose (by a eukaryotic cell) into carbon dioxide and water would produce approximately ATP molecules via oxidative phosphorylation only. (Consider NADH = 2.5 ATP and FADH2 = 1.5 ATP)arrow_forward
- The conversion of glyceraldehyde-3-phosphate into 1,3-bisphosphoglycerate reduces NAD+ to NADH. Under anaerobic conditions, how is NADH oxidized back to allow for continuing glycolysis? (name the compounds involved in the reaction besides NADH and their draw structures)arrow_forwardThe overall reactions for gluconeogenesis and glycolysis are given below. What is the energy cost (in ATP equivalents) of transforming one molecule of glucose to pyruvate (via glycolysis) and back to glucose (via gluconeogenesis)? Gluconeogenesis: 2 pyruvate + 4 ATP + 2 GTP + 2NADH + 4H₂O Glycolysis: Glucose + 2ADP + 2P₁ + 2NAD+ - 2 pyruvate + 2ATP + 2NADH + 2H+ + 2H₂000 Select one: O a. 2 ATP O b. 4 ATP O c. 6 ATP O d. 8 ATP Prev Page glucose + 4ADP + 2GDP + 2P₁ + 2NAD+ + 2H+ MI 21 22 00:508D DAD 1=1 SE 30: DONDOK 23 24 25 26 27 28 29 30 Report question issue B Next Page Garrow_forwardHow many molecules of ATP are produced from the complete metabolism of 2.12g of triacylglycerol containing two stearic acid chains and one palmitic acid chain? Assume that all electrons of cytosolic NADH are transferred through the dihydroxyacetone phosphate/glycerol 3-phosphate shuttlearrow_forward
- Although both hexokinase and phosphofructokinase catalyze irreversible steps in glycolysis and the hexokinase-catalyzed step is first, phosphofructokinase is nonetheless the pacemaker of glycolysis. What does this information tell you about the fate of the glucose 6- phosphate formed by hexokinase?arrow_forwardWhat is the total ATP produced from complete oxidation of 10 molecules of glucose asumming that the shuttel used is the glycerol-3-phosphate shuttle?arrow_forwardAlthough both hexokinase and phosphofructokinase catalyze irreversible steps in glycolysis and the hexokinase-catalyzed step is first, phosphofructokinase is nonetheless the pacemaker of glycolysis. What does this information tell you about the fate of the glucose 6-phosphate formed by hexokinase? Glucose 6-phosphate must be unstable and release its phosphoryl group over time. Glucose 6-phosphate must be utilized by other metabolic pathways. Glucose 6-phosphate must allosterically inhibit phosphofructokinase, but not hexokinase. Glucose 6-phosphate must be wasted when it is produced in excess.arrow_forward
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