Pre-med/IB-level practice on cellular respiration from glycolysis (cytosol) to pyruvate oxidation (link reaction), citric acid cycle (Krebs), anaerobic vs aerobic ATP yield, mitochondrial structure, electron transport chain, chemiosmosis, and ATP synthase—focused on concept traps and multi-step reasoning.
Where does glycolysis occur in a typical human cell?
Source: entermedschool.org
<!-- Glucose Metabolism: Glycolysis, Link Reaction, Krebs Cycle & ETC — EnterMedSchool -->
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src="https://entermedschool.org/embed/questions#{"title":"Glucose Metabolism: Glycolysis, Link Reaction, Krebs Cycle & ETC","questions":[{"prompt":"Where does glycolysis occur in a typical human cell?","options":[{"label":"A","body":"Mitochondrial matrix","isCorrect":false},{"label":"B","body":"Inner mitochondrial membrane","isCorrect":false},{"label":"C","body":"Cytosol","isCorrect":true},{"label":"D","body":"Nucleus","isCorrect":false},{"label":"E","body":"Endoplasmic reticulum lumen","isCorrect":false}],"explanation":"Glycolysis takes place in the cytosol and does not require mitochondria. The mitochondrial matrix houses the link reaction and Krebs cycle, while the inner membrane contains the ETC and ATP synthase."},{"prompt":"What is the net ATP yield from glycolysis per molecule of glucose (assuming it proceeds to pyruvate)?","options":[{"label":"A","body":"0 ATP","isCorrect":false},{"label":"B","body":"1 ATP","isCorrect":false},{"label":"C","body":"2 ATP","isCorrect":true},{"label":"D","body":"4 ATP","isCorrect":false},{"label":"E","body":"36 ATP","isCorrect":false}],"explanation":"Glycolysis uses 2 ATP (investment phase) and produces 4 ATP (payoff phase), giving a net gain of 2 ATP per glucose. 36 ATP refers to older estimates for total aerobic respiration, not glycolysis alone."},{"prompt":"Which set of products is generated by glycolysis per glucose molecule (before fermentation or mitochondrial oxidation)?","options":[{"label":"A","body":"2 pyruvate, 2 NADH, net 2 ATP","isCorrect":true},{"label":"B","body":"2 acetyl-CoA, 2 NADH, net 2 ATP","isCorrect":false},{"label":"C","body":"2 pyruvate, 2 FADH2, net 2 ATP","isCorrect":false},{"label":"D","body":"6 CO2, 2 NADH, net 2 ATP","isCorrect":false},{"label":"E","body":"2 lactate, 0 NADH, net 4 ATP","isCorrect":false}],"explanation":"Glycolysis converts glucose (6C) into 2 pyruvate (3C each), producing 2 NADH and net 2 ATP. Acetyl-CoA is produced in the link reaction, FADH2 is mainly from Krebs cycle, and CO2 release is not a feature of glycolysis."},{"prompt":"Glycolysis can continue without oxygen only if the cell can regenerate which molecule?","options":[{"label":"A","body":"FAD","isCorrect":false},{"label":"B","body":"Coenzyme A","isCorrect":false},{"label":"C","body":"NAD+","isCorrect":true},{"label":"D","body":"O2","isCorrect":false},{"label":"E","body":"ATP synthase","isCorrect":false}],"explanation":"Glycolysis requires NAD+ at the glyceraldehyde-3-phosphate dehydrogenase step; without regenerating NAD+, glycolysis stops. Fermentation regenerates NAD+ in anaerobic conditions; oxygen is not required for glycolysis itself."},{"prompt":"Which step of glycolysis directly requires NAD+ as a reactant?","options":[{"label":"A","body":"Glucose → glucose-6-phosphate","isCorrect":false},{"label":"B","body":"Fructose-6-phosphate → fructose-1,6-bisphosphate","isCorrect":false},{"label":"C","body":"Glyceraldehyde-3-phosphate → 1,3-bisphosphoglycerate","isCorrect":true},{"label":"D","body":"2-phosphoglycerate → phosphoenolpyruvate","isCorrect":false},{"label":"E","body":"Phosphoenolpyruvate → pyruvate","isCorrect":false}],"explanation":"NAD+ is reduced to NADH when glyceraldehyde-3-phosphate is oxidized to 1,3-bisphosphoglycerate. The other listed steps involve ATP use, rearrangements, dehydration, or substrate-level ATP formation but not NAD+ reduction."},{"prompt":"Which statement best defines substrate-level phosphorylation?","options":[{"label":"A","body":"ATP formation using energy from a proton gradient across a membrane","isCorrect":false},{"label":"B","body":"ATP formation by direct transfer of a phosphate group from a high-energy substrate to ADP","isCorrect":true},{"label":"C","body":"ATP formation only in the presence of oxygen","isCorrect":false},{"label":"D","body":"ATP formation by splitting glucose in half","isCorrect":false},{"label":"E","body":"ATP formation by attaching phosphate to glucose","isCorrect":false}],"explanation":"Substrate-level phosphorylation is direct phosphate transfer to ADP (e.g., in glycolysis and one step of Krebs). ATP synthase uses oxidative phosphorylation via a proton gradient, which is different."},{"prompt":"Which pair of glycolysis steps produces ATP directly by substrate-level phosphorylation?","options":[{"label":"A","body":"Hexokinase and phosphofructokinase-1","isCorrect":false},{"label":"B","body":"Glyceraldehyde-3-phosphate dehydrogenase and enolase","isCorrect":false},{"label":"C","body":"Phosphoglycerate kinase and pyruvate kinase","isCorrect":true},{"label":"D","body":"Aldolase and triose phosphate isomerase","isCorrect":false},{"label":"E","body":"Pyruvate dehydrogenase and citrate synthase","isCorrect":false}],"explanation":"ATP is formed at 1,3-BPG → 3-PG (phosphoglycerate kinase) and PEP → pyruvate (pyruvate kinase). Hexokinase and PFK-1 consume ATP; PDH and citrate synthase are not glycolysis enzymes."},{"prompt":"Which glycolysis enzyme catalyzes the committed, rate-limiting step in many cells?","options":[{"label":"A","body":"Hexokinase","isCorrect":false},{"label":"B","body":"Phosphofructokinase-1 (PFK-1)","isCorrect":true},{"label":"C","body":"Pyruvate kinase","isCorrect":false},{"label":"D","body":"Lactate dehydrogenase","isCorrect":false},{"label":"E","body":"ATP synthase","isCorrect":false}],"explanation":"PFK-1 converts fructose-6-phosphate to fructose-1,6-bisphosphate, a major committed step and key control point. Hexokinase is also regulated but is not the classic committed step; lactate dehydrogenase is fermentation, and ATP synthase is mitochondrial."},{"prompt":"High ATP levels in a cell would most directly tend to:","options":[{"label":"A","body":"Activate PFK-1 to speed up glycolysis","isCorrect":false},{"label":"B","body":"Inhibit PFK-1 to slow down glycolysis","isCorrect":true},{"label":"C","body":"Force pyruvate to become lactate","isCorrect":false},{"label":"D","body":"Increase oxygen binding to hemoglobin","isCorrect":false},{"label":"E","body":"Block glucose entry into the cell in all tissues","isCorrect":false}],"explanation":"ATP is a signal of high energy status and typically inhibits PFK-1, slowing glycolysis. Lactate formation is mainly driven by the need to regenerate NAD+ when aerobic oxidation is limited, not directly by ATP levels."},{"prompt":"A high AMP (or ADP) level in a cell generally indicates low energy. Which effect is most expected?","options":[{"label":"A","body":"Inhibition of PFK-1, slowing glycolysis","isCorrect":false},{"label":"B","body":"Activation of PFK-1, speeding glycolysis","isCorrect":true},{"label":"C","body":"Immediate stop of electron transport chain","isCorrect":false},{"label":"D","body":"Conversion of acetyl-CoA into glucose in humans","isCorrect":false},{"label":"E","body":"Direct synthesis of ATP without substrates","isCorrect":false}],"explanation":"AMP/ADP signal low energy and typically activate glycolysis by stimulating PFK-1 (and other pathways that generate ATP). They do not magically create ATP; they shift regulation to increase ATP production."},{"prompt":"What is the main purpose of fermentation in human muscle during intense exercise?","options":[{"label":"A","body":"To produce large amounts of ATP directly from lactate","isCorrect":false},{"label":"B","body":"To regenerate NAD+ so glycolysis can continue producing ATP","isCorrect":true},{"label":"C","body":"To produce acetyl-CoA for the Krebs cycle","isCorrect":false},{"label":"D","body":"To transport oxygen into mitochondria","isCorrect":false},{"label":"E","body":"To convert glucose into CO2 in the cytosol","isCorrect":false}],"explanation":"Fermentation (lactate production) oxidizes NADH back to NAD+, allowing glycolysis to keep running when mitochondrial oxidation is limited. It does not add extra ATP beyond glycolysis and does not produce acetyl-CoA."},{"prompt":"In lactic acid fermentation, pyruvate is converted to lactate. What happens to NADH in this reaction?","options":[{"label":"A","body":"NADH is produced from NAD+","isCorrect":false},{"label":"B","body":"NADH is oxidized to NAD+","isCorrect":true},{"label":"C","body":"NADH is converted into FADH2","isCorrect":false},{"label":"D","body":"NADH is pumped across the mitochondrial membrane","isCorrect":false},{"label":"E","body":"NADH becomes acetyl-CoA","isCorrect":false}],"explanation":"Lactate dehydrogenase uses NADH to reduce pyruvate to lactate, regenerating NAD+. The other options describe processes that do not occur in fermentation."},{"prompt":"Which statement about ATP yield is correct?","options":[{"label":"A","body":"Fermentation produces additional ATP beyond glycolysis","isCorrect":false},{"label":"B","body":"Anaerobic metabolism yields the same ATP per glucose as aerobic metabolism","isCorrect":false},{"label":"C","body":"Without oxygen, the net ATP per glucose from glycolysis is still 2","isCorrect":true},{"label":"D","body":"Without oxygen, glycolysis yields 0 ATP because NADH cannot form","isCorrect":false},{"label":"E","body":"Without oxygen, the Krebs cycle speeds up to compensate","isCorrect":false}],"explanation":"Even anaerobically, glycolysis yields net 2 ATP per glucose (if NAD+ is regenerated via fermentation). Fermentation's key role is NAD+ regeneration, not extra ATP production; Krebs/ETC slow without oxygen."},{"prompt":"Which process directly produces CO2 from pyruvate before the Krebs cycle begins?","options":[{"label":"A","body":"Glycolysis","isCorrect":false},{"label":"B","body":"Link reaction (pyruvate oxidation by pyruvate dehydrogenase)","isCorrect":true},{"label":"C","body":"ATP synthase activity","isCorrect":false},{"label":"D","body":"Lactic acid fermentation","isCorrect":false},{"label":"E","body":"Phosphorylation of glucose by hexokinase","isCorrect":false}],"explanation":"The link reaction converts pyruvate (3C) to acetyl-CoA (2C) and releases CO2 (1C), producing NADH. Glycolysis does not release CO2, and lactate fermentation does not produce CO2 in humans."},{"prompt":"During the link reaction, one pyruvate molecule (3 carbons) becomes:","options":[{"label":"A","body":"One acetyl-CoA (2C) + one CO2 (1C) + NADH","isCorrect":true},{"label":"B","body":"One acetyl-CoA (3C) + one CO2 (0C) + FADH2","isCorrect":false},{"label":"C","body":"Two acetyl-CoA (2C each) + one CO2","isCorrect":false},{"label":"D","body":"One lactate (3C) + NADH","isCorrect":false},{"label":"E","body":"One citrate (6C) directly","isCorrect":false}],"explanation":"Pyruvate dehydrogenase removes one carbon as CO2 and transfers the remaining 2-carbon acetyl group to CoA, generating NADH. Citrate forms later when acetyl-CoA combines with oxaloacetate."},{"prompt":"Where do the link reaction and Krebs cycle occur in eukaryotic cells?","options":[{"label":"A","body":"Cytosol","isCorrect":false},{"label":"B","body":"Mitochondrial matrix","isCorrect":true},{"label":"C","body":"Outer mitochondrial membrane","isCorrect":false},{"label":"D","body":"Inner mitochondrial membrane","isCorrect":false},{"label":"E","body":"Nucleus","isCorrect":false}],"explanation":"The link reaction (pyruvate → acetyl-CoA) and the Krebs cycle enzymes are located in the mitochondrial matrix. The ETC and ATP synthase are embedded in the inner mitochondrial membrane."},{"prompt":"Per acetyl-CoA entering the Krebs cycle, which set of reduced electron carriers is produced?","options":[{"label":"A","body":"2 NADH and 2 FADH2","isCorrect":false},{"label":"B","body":"3 NADH and 1 FADH2","isCorrect":true},{"label":"C","body":"1 NADH and 3 FADH2","isCorrect":false},{"label":"D","body":"4 NADH and 0 FADH2","isCorrect":false},{"label":"E","body":"0 NADH and 0 FADH2","isCorrect":false}],"explanation":"Each acetyl-CoA yields 3 NADH and 1 FADH2 in the Krebs cycle (plus 1 GTP/ATP and 2 CO2). The other combinations are incorrect and are common counting traps."},{"prompt":"How many CO2 molecules are released per acetyl-CoA during the Krebs cycle itself (not counting the link reaction)?","options":[{"label":"A","body":"0","isCorrect":false},{"label":"B","body":"1","isCorrect":false},{"label":"C","body":"2","isCorrect":true},{"label":"D","body":"3","isCorrect":false},{"label":"E","body":"6","isCorrect":false}],"explanation":"In the Krebs cycle, two decarboxylation steps release 2 CO2 per acetyl-CoA. A third CO2 per pyruvate is released earlier in the link reaction, not in the cycle itself."},{"prompt":"Which step produces GTP (or ATP equivalent) directly in the Krebs cycle?","options":[{"label":"A","body":"Citrate synthase step","isCorrect":false},{"label":"B","body":"Isocitrate → α-ketoglutarate","isCorrect":false},{"label":"C","body":"Succinyl-CoA → succinate","isCorrect":true},{"label":"D","body":"Succinate → fumarate","isCorrect":false},{"label":"E","body":"Malate → oxaloacetate","isCorrect":false}],"explanation":"Succinyl-CoA synthetase performs substrate-level phosphorylation to generate GTP (or ATP). The other steps produce NADH/FADH2 or are condensation/rearrangement reactions, not direct ATP/GTP formation."},{"prompt":"Which statement best explains why the Krebs cycle is considered 'aerobic' even though O2 is not used directly in the cycle?","options":[{"label":"A","body":"O2 is a substrate in the citrate synthase reaction","isCorrect":false},{"label":"B","body":"The cycle requires NAD+ and FAD, which are regenerated mainly by the electron transport chain that depends on O2","isCorrect":true},{"label":"C","body":"The cycle occurs in the lungs, where O2 is abundant","isCorrect":false},{"label":"D","body":"O2 is produced by the cycle, so it must be aerobic","isCorrect":false},{"label":"E","body":"The cycle only occurs during exercise","isCorrect":false}],"explanation":"The Krebs cycle needs oxidized NAD+ and FAD; these are regenerated when NADH/FADH2 donate electrons to the ETC, which requires oxygen as the final electron acceptor. Without O2, NADH accumulates and the cycle slows/stops."}]}"
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