CENTRO ESCOLAR SOLALTO
                  10th Biology
                  Teacher Javier Aguirre, B.A.
                  3rd...
6. Which molecule accepts electrons from the final carrier in the electron
transport chain?
     a.   NAD
     b.   Pyruvi...
6. Summarize the steps of glycolysis.
     Two (2) ATP molecules are used to split glucose into two three-carbon
     mole...
2. Use the diagram below to answer the questions. (6 points; 2 points each)




   a. What are the chemical reactants in p...
3. The data table below lists the kilocalories (kcal) needed for various
   activities. Refer to the table to answer the q...
3. Explain the following statement: Heterotrophs depend on autotrophs for
   energy.
   Heterotrophs cannot make their own...
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Answer key quiz no. 1 (3rd mp 2010)

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This is the answer key for the 3rd marking period´s partial exam.

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Answer key quiz no. 1 (3rd mp 2010)

  1. 1. CENTRO ESCOLAR SOLALTO 10th Biology Teacher Javier Aguirre, B.A. 3rd Term 2010 NAME_________________________ Date: _____________ Biology Partial Exam No. 1 Multiple Choice: Please, circle the letter of the best answer. (7 points; 1 point each) 1. Heterotrophs are also called _______________. a. producers b. autotrophs c. consumers d. "self-feeders" 2. What are the waste products of cellular respiration? a. Carbon dioxide and water b. ATP and ADP c. Carbon dioxide and oxygen d. Energy and glucose 3. What metabolic stage is part of both cellular respiration and fermentation? a. Electron transport b. Glycolysis c. Krebs cycle d. ATP Synthase action 4. What is the net gain of ATP molecules produced directly by glycolysis? a. 2 b. 4 c. 34 d. 38 5. Electron transport occurs in the _______________. a. cytoplasm b. matrix of the mitochondria c. outer membrane of the mitochondria d. inner membrane of the mitochondria
  2. 2. 6. Which molecule accepts electrons from the final carrier in the electron transport chain? a. NAD b. Pyruvic acid c. Oxygen d. Carbon 7. Which of the following molecules is not involved in fermentation? a. Glucose b. Pyruvic acid c. NADH d. Oxygen Short Answer: Please answer the following question with a brief but accurate statement. (16 points; 2 points each) 1. Explain why it can be said that most of life on Earth is solar-powered. Producers (autotrophs) depend on light energy from the sun to execute photosynthesis. Producers and consumers depend on the products of photosynthesis for energy to perform cellular functions. 2. Describe what happens to the chemical energy in food that is not converted to useful cellular work. It is released in the form of thermal energy (heat). 3. How could you measure the calorie content of a peanut in the laboratory? Burn a peanut under an insulated container of water to convert its stored chemical energy into thermal energy (heat). Measure the increase in water temperature to calculate the number of calories in a peanut. 4. Describe how energy is stored in an ATP molecule. Energy is stored in the bonds that connect the phosphate groups in ATP. Each phosphate group in ATP is negatively charged, and since like charges repel, the crowding of the phosphate groups in the ATP tail contributes to the potential energy stored in ATP. 5. What are the three main types of cellular work? Give an example of each. Chemical work  Building a large molecule, such as a protein Mechanical work  Contracting muscle cells Transport work  Pumping ions across a membrane
  3. 3. 6. Summarize the steps of glycolysis. Two (2) ATP molecules are used to split glucose into two three-carbon molecules, which transfer electrons and H+ ions to NAD+ creating NADH. In the next step, two (2) pyruvic acid molecules and 4 ATP molecules are created. 7. Which stage of cellular respiration uses oxygen directly to extract chemical energy from organic compounds? Explain the steps in this stage. The Electron Transport Chain uses oxygen directly to extract chemical energy from organic compounds. NADH transfers electrons and these move from carrier to carrier, until they are pulled to oxygen at the end of the chain. Oxygen and the electrons combine with hydrogen ions to form water. 8. Compare and contrast fermentation that occurs in human muscle cells and in yeast cells. Both break down glucose without oxygen. The waste product of fermentation in muscle cells is lactic acid. The waste product in yeast fermentation is ethyl alcohol. Visualizing Concepts: (6 points; 1 point each) 1. Fill in the blank spaces with the information that correctly completes this fermentation concept map. a. Bacterial fungi d. CO2 b. Yeast cells e. Sour taste / decomposition c. Lactic acid f. Bubbles / it to rise
  4. 4. 2. Use the diagram below to answer the questions. (6 points; 2 points each) a. What are the chemical reactants in photosynthesis? What are the chemical products? Reactants: Carbon dioxide and water Products: Oxygen and glucose b. What do the double arrows in each reaction indicate? They indicate the direction in which the reaction occurs. c. How are photosynthesis and cellular respiration related? How are they different? They are related because each produces chemicals used by the other reaction. They are different because photosynthesis stores energy in chemical compounds, while cellular respiration transfers that energy to ATP.
  5. 5. 3. The data table below lists the kilocalories (kcal) needed for various activities. Refer to the table to answer the questions that follow. (6 points; 2 points each) a. How many hours would a 67.5-kg person have to walk to use up the energy contained in a cheeseburger containing 430 kcal? About 2.72 hours b. How far would this person have walked if he were walking 3 km per hour? About 8.16 km c. What form of exercise would use up the cheeseburger's calories in the shortest amount of time? Explain your answer. The best form of exercise is running because it burns the most calories per hour. Applying Concepts - Analyzing Information (12 points; 4 points each) 1. Red blood cells do not contain mitochondria. Which stage or stages of sugar breakdown can take place in these cells? Explain your answer. Glycolysis is the only stage that does not take place in the mitochondria. (Cytoplasm) 2. How is the process by which your body extracts energy from food similar to how a car's engine extracts energy from fuel? How is it different? Both use oxygen while burning organic molecules (aerobic). Both produce water and CO2 as waste products and convert some energy into thermal energy (heat). Our cells, however, are more efficient and lose less energy as heat. Cars use gasoline; cells use glucose.
  6. 6. 3. Explain the following statement: Heterotrophs depend on autotrophs for energy. Heterotrophs cannot make their own food. They need the organic molecules created by autotrophs for the chemical energy to support life processes. What's Wrong With These Statements? (6 points; 2 points each) Briefly explain why each statement is inaccurate or misleading. 1. Plants carry out photosynthesis plus cellular respiration and animals carry out cellular respiration. 2. NADH and FADH trap most of the energy released from food during the Krebs cycle. Or Most ATP is produced from food during the Electron Transport Chain. 3. While sprinting, your muscle cells decrease cellular respiration and increase fermentation to produce ATP. Integration (15 points; 5 points each) Briefly explain through a drawing the three stages of cellular respiration, including where each one takes place and the amount of ATP that is invested and produced with each one.

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