2. Click on a lesson name to select. Cells and Energy Section 4.1: How Organisms Obtain Energy Section 4.2, 4.3: Photosynthesis Section 4.4, 4.5, 4.6: Cellular Respiration

3. Transformation of Energy  Energy is the ability to do work. Chemical Energy and ATP Cells and Energy  Thermodynamics is the study of the flow and transformation of energy in the universe. Section 4.1

4. Laws of Thermodynamics  First law—energy can be converted from one form to another, but it cannot be created nor destroyed. Cells and Energy  Second law—energy cannot be converted without the loss of usable energy. Section 4.1

5. Autotrophs and Heterotrophs  Autotrophs are organisms that make their own food. Cells and Energy  Heterotrophs are organisms that need to ingest food to obtain energy. Section 4.1

6. Metabolism  All of the chemical reactions in a cell Photosynthesis Cells and Energy  Photosynthesis—light energy from the Sun is converted to chemical energy for use by the cell  Cellular respiration—organic molecules are broken down to release energy for use by the cell Section 4.2

7. Overview of Cellular Respiration  ATP releases energy when the bond between the second and third phosphate groups is broken, forming a molecule called adenosine diphosphate (ADP) and a free phosphate group. How Organisms Obtain Energy Cells and Energy Section 4.4 ATP

8. Overview of Photosynthesis  Photosynthesis occurs in two phases. Cells and Energy  Light-dependent reactions  Light-independent reactions Photosynthesis Section 4.3

9. Phase One: Light Reactions  The absorption of light is the first step in photosynthesis. Cells and Energy  Chloroplasts capture light energy. Photosynthesis Section 4.3

10. Electron Transport  Light energy excites electrons in photosystem II and also causes a water molecule to split, releasing an electron into the electron transport system, H + into the thylakoid space, and O 2 as a waste product. Cells and Energy Photosynthesis Section 4.3

11.  The excited electrons move from photosystem II to an electron-acceptor molecule in the thylakoid membrane.  The electron-acceptor molecule transfers the electrons along a series of electron-carriers to photosystem I. Cells and Energy Photosynthesis Section 4.3

12. Cells and Energy Photosynthesis  Photosystem I transfers the electrons to a protein called ferrodoxin.  Ferrodoxin transfers the electrons to the electron carrier NADP +, forming the energy- storing molecule NADPH. Section 4.3

13. Cells and Energy Photosynthesis Phase Two: The Calvin Cycle  In the second phase of photosynthesis, called the Calvin cycle, energy is stored in organic molecules such as glucose. Section 4.3

14. Cells and Energy Photosynthesis  Six CO 2 molecules combine with six 5-carbon compounds to form twelve 3-carbon molecules called 3-PGA.  The chemical energy stored in ATP and NADPH is transferred to the 3-PGA molecules to form high-energy molecules called G3P. Section 4.3

15. Cells and Energy Photosynthesis  Two G3P molecules leave the cycle to be used for the production of glucose and other organic compounds.  An enzyme called rubisco converts the remaining ten G3P molecules into 5-carbon molecules called RuBP.  These molecules combine with new carbon dioxide molecules to continue the cycle. Section 4.3

16. Overview of Cellular Respiration  Organisms obtain energy in a process called cellular respiration. Cellular Respiration Cells and Energy  The equation for cellular respiration is the opposite of the equation for photosynthesis. Section 4.4

17. Cellular Respiration Cells and Energy  Cellular respiration occurs in two main parts.  Glycolysis  Aerobic respiration Section 4.5

18. Glycolysis  Glucose is broken down in the cytoplasm through the process of glycolysis. Cellular Respiration Cells and Energy  Two molecules of ATP and two molecules of NADH are formed for each molecule of glucose that is broken down. Section 4.5

19. Krebs Cycle  Glycolysis has a net result of two ATP and two pyruvate. Cellular Respiration Cells and Energy  Most of the energy from the glucose is still contained in the pyruvate.  The series of reactions in which pyruvate is broken down into carbon dioxide is called the Krebs cycle. Section 4.5

20. Cellular Respiration Cells and Energy  The net yield from the Krebs cycle is six CO 2 molecules, two ATP, eight NADH, and two FADH 2. Section 4.5

21. Cellular Respiration Cells and Energy Electron Transport  Final step in the breakdown of glucose  Point at which ATP is produced  Produces 24 ATP Section 4.5

22. Cellular Respiration Cells and Energy Anaerobic Respiration  The anaerobic pathway that follows glycolysis  Two main types  Lactic acid fermentation  Alcohol fermentation Section 4.5, 4.6

23. 1.A 2.B 3.C 4.D CDQ 1 A. Energy cannot be converted or destroyed. B. Energy can be converted and destroyed. C. Energy can be converted but not destroyed. D. Energy can be destroyed but not converted. Which statement describes the law of conservation of energy? Cellular Energy Chapter Diagnostic Questions Chapter

24. 1.A 2.B 3.C 4.D CDQ 2 Cellular Energy Chapter Diagnostic Questions Chapter A. photosynthesis B. cellular respiration C. homeostasis D. fermentation In which metabolic process are molecules broken down to produce carbon dioxide and water?

25. 1.A 2.B 3.C 4.D CDQ 3 Cellular Energy Chapter Diagnostic Questions Chapter A. NADPH B. ATP C. chloroplast D. glucose At the end of the Calvin cycle, where is energy stored?

26. 1.A 2.B FQ 1 Cellular Energy Chapter Which law of thermodynamics explains why the ladybug receives the least amount of usable energy? A. the first law of thermodynamics B. the second law of thermodynamics Section 1 Formative Questions

27. 1.A 2.B FQ 2 Cellular Energy Chapter Section 1 Formative Questions All of the energy from the food you eat comes from the sun. A. true B. false

28. 1. A 2. B 3. C 4. D FQ 3 Cellular Energy Chapter Section 1 Formative Questions Why is cellular respiration a catabolic pathway? A.Energy is used to form glucose and oxygen. B.Energy is converted from water to carbon dioxide. C.Energy that is lost is converted to thermal energy. D.Energy is released by the breakdown of molecules.

29. 1. A 2. B 3. C 4. D FQ 4 Cellular Energy Chapter Section 1 Formative Questions A.It captures light energy from the sun. B.It is produced in anabolic pathways. C.It stores and releases chemical energy. D.It converts mechanical energy to thermal energy. Why is adenosine triphosphate (ATP) such an important biological molecule?

30. 1. A 2. B 3. C 4. D FQ 5 Cellular Energy Chapter A. chloroplasts B. Golgi apparatus C. mitochondria D. vacuoles Where in the plant cell does photosynthesis take place? Section 2 Formative Questions

31. 1. A 2. B 3. C FQ 6 Cellular Energy Chapter Section 2 Formative Questions A. 400-500 nm B. 500-600 nm C. 600-700 nm Which range of wavelengths is reflected by chlorophylls a and b?

32. 1. A 2. B 3. C 4. D FQ 7 Cellular Energy Chapter Section 2 Formative Questions A. absorption B. chemiosmosis C. electron transport D. C 2 pathway Which mechanism of photosynthesis uses the movement of hydrogen ions (H + ) across a concentration gradient to synthesize ATP?

33. 1. A 2. B 3. C 4. D FQ 8 Cellular Energy Chapter Section 2 Formative Questions A. They accelerate photosynthesis. B. They release more oxygen. C. They help the plant conserve water. D. They reduce the requirement for ATP. How are the C 4 pathway and the CAM pathway an adaptive strategy for some plants?

34. 1. A 2. B 3. C 4. D FQ 9 Cellular Energy Chapter A. to make ATP B. to process H 2 O C. to store glucose D. to deliver oxygen What is the overall purpose of cellular respiration? Section 3 Formative Questions

35. 1. A 2. B 3. C 4. D FQ 10 Cellular Energy Chapter Which represents the general sequence of cellular respiration? A.TCA cycle  chemiosmosis  glycolysis B.glycolysis  Krebs cycle  electron transport C.electron absorption  catalysis  phosphorylation D.aerobic pathway  anaerobic pathway  fermentation Section 3 Formative Questions

36. 1. A 2. B 3. C FQ 11 Cellular Energy Chapter A. glycolysis B. Krebs cycle C. electron transport Which stage of cellular respiration is the anaerobic process? Section 3 Formative Questions

37. 1. A 2. B 3. C 4. D FQ 12 Cellular Energy Chapter A. CoA B. CO 2 C. FADH 2 D. NADH Which molecule generated by the Krebs cycle is a waste product? Section 3 Formative Questions

38. 1. A 2. B 3. C 4. D CAQ 1 Cellular Energy Chapter Look at the following figure. Which part of the chloroplast is a sac-like membrane arranged in stacks? A. grana B. stroma C. thylakoids D. Golgi apparatus Chapter Assessment Questions

39. 1. A 2. B 3. C 4. D CAQ 2 Cellular Energy Chapter Chapter Assessment Questions During the Krebs cycle, pyruvate is broken down into what compound? A. H 2 O B. O 2 C. CO D. CO 2

40. 1. A 2. B 3. C 4. D CAQ 3 Cellular Energy Chapter Chapter Assessment Questions Look at the following figure. Which molecule is released when ATP becomes ADP? A. phosphate group B. water molecule C. ribose sugar D. energy cells

41. 1. A 2. B STP 1 Cellular Energy Chapter Which metabolic process is photosynthesis? A B Standardized Test Practice

42. 1. A 2. B 3. C 4. D STP 2 Cellular Energy Chapter Standardized Test Practice At the beginning of photosynthesis, which molecule is split to produce oxygen (O 2 ) as a waste product? A. CO 2 B. H 2 O C. C 6 H 12 O 6 D. 3-PGA

43. 1. A 2. B 3. C 4. D STP 3 Cellular Energy Chapter Standardized Test Practice Which molecule helps provide the energy that drives this cycle? A. 3-PGA B. CO 2 C. NADPH D. rubisco

44. 1. A 2. B 3. C 4. D STP 4 Cellular Energy Chapter Standardized Test Practice Which product of the Calvin cycle is used for the production of glucose and other organic compounds? A. ADP B. CO 2 C. G3P D. NADP +

45. 1. A 2. B 3. C 4. D STP 5 Cellular Energy Chapter Standardized Test Practice What is the final step of cellular respiration? A. O 2 and H + form H 2 O. B. Electrons and H 2 O generate ATP. C. C 6 H 12 O6 is broken down into CO 2. D. NADH and FADH 2 gain electrons.

46. 1. A 2. B 3. C 4. D STP 6 Cellular Energy Chapter Standardized Test Practice What prevents pyruvate from entering the Krebs cycle and instead results in this pathway? A. a buildup of CO 2 B. a lack of oxygen C. an excess of glucose D. an increased demand for ATP

47. 1. A 2. B 3. C 4. D STP 7 Cellular Energy Chapter Standardized Test Practice Which is not a process that occurs in both cellular respiration and glycolysis? A. chemiosmosis B. electron transport C. glycolysis D. production of G3P

48. Cellular Energy Glencoe Biology Transparencies Chapter

49. Cellular Energy Image Bank Chapter