MCQ Chapter 13 Biology Class 11 Maharashtra Board Respiration and Energy Transfer 1. Which cells rely solely on glycolysis for energy production?Liver cellsErythrocytesMuscle cellsNerve cellsQuestion 1 of 202. Why do red muscle fibers sustain prolonged work?Higher lactic acid productionMore myoglobin contentFaster glycolysisLess ATP productionQuestion 2 of 203. What causes muscle fatigue after vigorous exercise?Accumulation of ethanolAccumulation of lactic acidDepletion of oxygenLoss of glucoseQuestion 3 of 204. Which enzyme is involved in the oxidation of succinate in the Krebs cycle?Pyruvate dehydrogenaseSuccinate dehydrogenaseHexokinaseEnolaseQuestion 4 of 205. What is the role of magnesium ions (Mg²⁺) in glycolysis?Inhibits enzymesActs as a co-factorTransports electronsStores energyQuestion 5 of 206. Why is the Krebs cycle considered an amphibolic pathway?It only breaks down glucoseIt involves both catabolism and anabolismIt produces only ATPIt occurs in the cytoplasmQuestion 6 of 207. Which molecule is used as a precursor for fatty acid synthesis in the Krebs cycle?Citric acidAcetyl CoAOxaloacetic acidSuccinateQuestion 7 of 208. What happens to NADH+H⁺ produced in glycolysis in muscles during anaerobic conditions?It is oxidized to NAD⁺It is converted to FADH₂It is stored in mitochondriaIt is released as CO₂Question 8 of 209. What indicates the production of CO₂ in the yeast fermentation experiment?Smell of alcoholRise in lime water levelMilky lime waterDecrease in glucoseQuestion 9 of 2010. Why does the level of lime water not rise in the yeast fermentation experiment?Oxygen is consumedNo gas volume changeGlucose is depletedEthanol is producedQuestion 10 of 2011. What gas is absorbed by potassium hydroxide in the seed germination experiment?OxygenNitrogenCarbon dioxideHydrogenQuestion 11 of 2012. Which step of aerobic respiration is omitted when fatty acids are used as a substrate?GlycolysisKrebs cycleElectron transport chainTerminal oxidationQuestion 12 of 2013. What is the significance of respiration in maintaining atmospheric balance?It produces oxygenIt balances CO₂ and O₂It removes nitrogenIt synthesizes glucoseQuestion 13 of 2014. Which enzyme catalyzes the formation of 2-phosphoenolpyruvate in glycolysis?EnolasePyruvate kinaseAldolasePhosphoglycerate kinaseQuestion 14 of 2015. What is the overall reaction product of glycolysis besides pyruvate?2 ATP, NADH+H⁺4 ATP, 4 NADH+H⁺2 ATP, 2 FADH₂4 ATP, 2 FADH₂Question 15 of 2016. Which factor does NOT control the rate of glycolysis?ATP consumptionHormone levelsEnzyme regulationOxygen availabilityQuestion 16 of 2017. What is the role of complex V in the ETS?Oxidizes NADHTransfers electronsSynthesizes ATPReduces oxygenQuestion 17 of 2018. Why are some reactions in glycolysis irreversible?High energy barriersLack of enzymesLow ATP productionExcess glucoseQuestion 18 of 2019. Which tissue depends heavily on glycolysis for energy?LiverRenal medullaHeart musclePancreasQuestion 19 of 2020. What is the significance of myoglobin in red muscle fibers?Stores glucoseStores oxygenProduces ATPRemoves CO₂Question 20 of 20 Loading...
Leave a Reply