Unformatted text preview: Cellular Respiration and Photosynthesis Worksheet Cellular Respiration Q1. What does it mean when something is oxidized or reduced? Oxidized - It loses an electron (or electrons) Reduced It gains an electron (or electrons) Way to remember: OIL RIG Oxidation is Loss, Reduction is Gain Q2. WRITE the redox equation for cellular respiration A. What are the reactants? What are the products? Reactants: Glucose and Oxygen. Products: Carbon dioxide and water B. Which molecules are oxidized? Which are reduced? Glucose will be oxidized Oxygen will be reduced C. Is this reaction ender- or exergonic? Exergonic energy is released Q3. Glycolysis A. What are the products of glycolysis? Where does it take place? 2 pyruvate molecules 2 water molecules 2 ATP (net) 2 NADH 2H+ ions Takes place in cytosol B. What is substrate level phosphorylation? The formation of ATP by an enzyme directly transferring a phosphate group to ADP from an intermediate substrate in catabolism. Q4. Citric Acid Cycle (CAC) A. What must happen to pyruvate before it enters the CAC cycle? Must be converted into acetyl-CoA B. What are the products of the CAC cycle? Where does it take place? For each molecule of ACoa: 2 CO2 3 NADH 1 FADH2 1 ATP Takes place in mitochondrial matrix . Note it also generates ATP via Substrate level phosphorylation. Q5. Oxidative phosphorylation H+ H+ H+ H+ A Inner Mitochondrial Membrane FAD H 2O
H+ B C Oxidative Phosphorylation D A. What parts of the mitochondria are shown by A and B? Which has the higher pH? (A): Inter membrane space (B) Mitochondrial Matrix (Higher pH) B. What processes or components of oxidative phosphorylation are C and D referring to? (C) Electron Transport chain (D) Chemiosmosis C. What reactants, molecules, or atoms do the red boxes indicate? D. Hydrogen ions are using two forms of transport in this diagram. What are they? Active transport to move H+ ions out of the matrix and into the intermembrane space. Facilitated Diffusion H+ ions moving down their concentration gradient into the Mitochondrial Matrix through the ATP Synthase. E. In regards to the amount of ATP produced by each step of cellular respiration, which of the relationships is TRUE? A: Glycolysis > Oxidative Phosphorylation > Citric Acid Cycle B: Oxidative Phosphorylation > Citric Acid Cycle > Glycolysis C: Glycolysis > Citric Acid Cycle > Oxidative Phosphorylation D: Oxidative Phosphorylation > Glycolysis = Citric Acid Cycle Oxidative phosphorylation : 32-34 Glycolysis = 2 Citric Acid Cycle = 2 Important to note that both Glycolysis and Citric Acid Cycle generate ATP via substrate level phosphorylation. Q6. Pyruvate is a key juncture in catabolism. In the presence of oxygen, pyruvate will be used in cellular respiration. When no oxygen is available, pyruvate will be fermented into lactic acid. A. What role does oxygen fulfill in cellular respiration? Final electron acceptor during oxidative phosphorylation. B. Why is lactic acid fermentation important under these conditions? Allows for the regeneration of NAD+ Photosynthesis Q1. What are the 3 "ingredients" of photosynthesis? Where do they come from? CO2 enters through stomata on leaves H2O absorbed by roots and delivered to leaves by veins. Light energy captured by photosensitive pigments in the thylakoid membrane of chloroplasts. Q2. Write the redox reaction for photosynthesis. 6CO2+12H2O --> C6H12O6 + 6O2+ 6H2O A. What are the reactants? What are the products? Reactants: CO2 and Water Products: Glucose, O2, and Water B. Which molecules are oxidized? Which are reduced? Water will be oxidized CO2 will be reduced C. Is this reaction ender- or exergonic? Endergonic D. From what reactant is oxygen formed? From Water Q3. Light Reaction A 1 2 3 B 4 To Dark Reactions A. What environments are labeled A and B? Which has the lower H+ concentration? (A) Stroma (Lower H+ concentration) (B) Thylakoid Space B. What are the names of the enzymes or complexes in the black boxes? C. Do hydrogen ions flow into or out of the region noted by the letter B? D. What molecules, ions, complexes, etc are circled in yellow? Answers for B, C, and D are below Q4. What are the inputs and outputs of the dark reactions? Which output is used to make macromolecules and which is re-used by the cycle? Inputs: CO2, ATP, and NADPH Outputs: ADP,P , NADP+, G3P, RuBP G3P used to make glucose and other organic compounds RuBP is generated to allow the cycle to repeat Q5. This is summary figure of photosynthesis. This is the same activity completed in lecture. Label the processes, reactants, intermediates, and products that this figure shows. ...
View Full Document