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BIOL 1500 (18)


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York University
BIOL 1500
Tanya Da Sylva

1Explain how breathing and cellular respiration are related When you breath you inhale oxygen In breathingyou inhale oxygen which is used in cellular respiration in the Krebs cycle and also in the electron chain to accept oxygen ions Waste product of CR is carbon dioxide released as citric acid is broken down in the Citric acid cycle of Krebs Cycle and carbon molecule attaches to an O to exit the body 2as carbon dioxideDescribe the roe of redox reactions in photosynthesis and cellular respirationoOxidation is the loss of electrons or the increase in oxidation state by a molecule oReduction is the gain of electrons or a decrease in oxidation by a molecule oCellular respiration depend on the reduction of NAD to NADH and the oxidation of NADH to NAD oThe NADH are then used to fuel the proton pump and create a concentration gradient in the intermembrane space In oPhotosynthesis the oxidation of CO2 to glucoseo cellular respiration oxidizes glucose to CO2 and oxygen to water and photosynthesis oxidizes CO2 to glucose and water to oxygenCompare and contrast the process and location of cellular respiration and photosynthesis 5 Similarities 1 both involve electron transport chains 2 Chemiosmosis allows ATP synthase to produce ATP 3 Both take place at some point within an organelle mitCR chloroplast photo 4 Both utilize ATP for energy at some points 5 Both provide power for cellular activities 5 Differences 1 Cellular respiration depends on oxygen as a substrate 2 Photosynthesis utilizes 2 electron transport chains not just 1 3 In Photoenergy is provided by photons and not catabolic processes as in cell resp 4 Photosynthesis involves the production of NADPH CR involves NADH and FADH2 5 Photosynthesis involves CO2 and H20 as substrates splitting h20 provides the electrons for the process Describe the overall process of the light reactions and the Calvin cycle noting products reactants and locations of every major stepoCalvin cycle three phases carbon fixation reduction and regeneration of RuBP the CO2 acceptor oThe Calvin cycle relies on the light reactions to provide the required ATP and NADPHoThe Calvin cycle occurs in the stroma of the chloroplast
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