Name______Date______Period______

Unit 4 Cellular Energy Worksheet

1. Study the diagram below. Label the processes using the following terms: Oxidative Respiration, Lactic Acid Fermentation, Glycolysis,

Alcoholic Fermentation, Krebs cycle, ETC

2. Fill in the blanks with the number of molecules produced from each process.

3. Write the number of ATP molecules produced by each process listed below. Then add up these numbers to get the total number of ATP molecules

produced when one glucose molecule is broken down by cellular respiration.

______ATP made in Glycolysis; ______ATP made in Krebs cycle; +______ATP made in the Electron Transport Chain

=______ATP total for the breakdown of one glucose molecule during cellular respiration

Answer the questions below.

4. What molecule provides energy in the cell where it is needed? (Use full name!!!)______

5. ATP has ______phosphate groups. ADP has ______phosphates.

6. The energy in ATP is stored in its ______.

7. Define autotroph and give an example: ______

8. Define heterotroph and give an example:______

9. Aerobic means it ______oxygen whereas anaerobic means it ______oxygen.

11. Fill in the chart using your notes and illustrations.

Process / Where does it Occur? / Aerobic or anaerobic? / Reactants / Products
Step 1: Glycolysis
Step 2: Oxidative Resp: Krebs Cycle
Step 2:Oxidative Resp: ETC
Step 2: Alcoholic Fermentation
Step 2: Lactic Acid Fermentation

12. Most eukaryotic cells produce about ______ATP molecules per glucose molecule.

13. What is the process by which glucose is converted into pyruvic acid? ______.

14The enzyme necessary to break down the carbohydrate sucrose is ______.

15. With every turn of the Krebs Cycle, how many ATP Molecules are made? ______. So, each glucose produces _____ ATP in Kreb’s cycle.

16. What is the primary waste product of the Krebs Cycle? ______. What happens to this product? ______.

17. When pyruvic acid is converted into carbon dioxide and ethanol (alcohol), the process is called ______.

18. The Krebs Cycle is also known as the ______Acid Cycle.

19. The electron transport chain is driven by two products of the Krebs Cycle - ______and ______.

20. Write the balanced chemical equation for cellular respiration. Label “reactants” and “products”.

______--______

21. What do the molecules NADH and FADH2 transfer to the ETC? ______.

22. What is the main purpose of the ETC?______

23. Why is oxygen important to the ETC?______

24. Write the equation for photosynthesis. Label each side of the equation as “reactants” or “products”.

______-->______

25. What is the relationship between photosynthesis and cellular respiration?______

26. What organisms use alcoholic fermentation? ______

27. What type of fermentation do human muscle cells go through when exercising rapidly? ______

Match the following terms with their meaning or purpose. Items can be used more than once, some have more than 1 answer.

______28. molecule that stores and transports energy in the cell

______29. C6H12O6

______30. C3H6O3 (1/2 a glucose molecule)

______31. CO2

______32. gas that is the product of photosynthesis and is a reactant in cellular respiration

______33. gas that is produced as a waste product of cellular respiration and a reactant in photosynthesis

______34. organelle where cellular respiration occurs

______35. organelle where photosynthesis occurs

______36. location in cell where glycolysis and fermentation takes place

______37. Glucose is broken down into two molecules called __in the process called glycolysis

______38. green pigment in plants that absorbs light energy for plants to use

______39. Builds up in muscles when no oxygen available

______40. term describing a process that requires oxygen to happen

______41. term describing a process happens only in the absence of oxygen

______42. has three phosphate groups

______43. organisms such as plants that can make their own food

______44. organisms like animals that can not make their own food, they must consume food to get energy

______45. adenosine triphosphate

______46. organelle where the energy in food is handed over to ATP

______47. mushrooms are classified as ___, because they live off of dead or decaying organisms to get energy

______48. has only two phosphate groups (has less energy)

______49. Contains a double membrane, ribosomes, circular DNA

______50. ATP Synthase occurs only in the cell membrane of ___cells.