Chapter 4 Practice Test (Sec 4.1 & 4.2)

26. Which of the following is oxidized in photosynthesis? a. O2 (oxygen) b. CO2 (carbon dioxide) c. C6H12O6 (glucose) d. ATP e. H2O (water)

e. H2O (water)

3. In the food chain grass --> grasshopper --> snake --> hawk, which organism(s) are the heterotrophs? a. the grass b. the grass and grasshopper c. the hawk d. the grasshopper, snake, and hawk

d. the grasshopper, snake, and hawk

14. Essentially, the oxygen we breathe is a. necessary for the light reactions to proceed. b. a waste product of photosynthesis. c. a reactant of the Calvin cycle. d. essential for the homeostasis of the plant cell.

b. a waste product of photosynthesis.

18. Which of the following is produced by the light reactions of photosynthesis and consumed by the Calvin cycle? a. NADPH b. O2 c. H2O d. sugar e. ADP + P

a. NADPH

13. ATP synthase is a. both an enzyme that makes ATP and a channel protein, and helps hydrogen ions cross the thylakoid membrane. b. both an enzyme that makes ATP and a channel protein, and helps hydrogen ions cross the chloroplast inner membrane. c. both an enzyme that makes ATP and a carrier protein, and helps hydrogen ions cross the thylakoid membrane. d. both an enzyme that makes ATP and a carrier protein, and helps hydrogen ions cross the chloroplast inner membrane.

a. both an enzyme that makes ATP and a channel protein, and helps hydrogen ions cross the thylakoid membrane.

12. By the end of the light reactions, energy from sunlight a. has been stored in chemical bonds of NADPH and ATP. b. has been transferred to glucose. c. has entered the Calvin cycle. d. is ready for use in the cell.

a. has been stored in chemical bonds of NADPH and ATP.

18. The photo part of the word photosynthesis refers to____,whereas synthesis refers to ____ a. the reactions that occur in the thylakoids .... carbon fixation b. the reactions in the stroma .... the reactions in the thylakoids c. the Calvin cycle .... carbon fixation d. the Calvin cycle .... the reactions in the stroma

a. the reactions that occur in the thylakoids .... carbon fixation

5. Photosynthesis can be described as the process that a. uses carbon dioxide and water, in the presence of sunlight, to produce food (glucose) and oxygen. b. uses glucose and oxygen to produce energy for the cell (ATP), releasing carbon dioxide and water. c. uses glucose and oxygen, in the presence of sunlight, to make ATP. d. uses carbon dioxide and water, in the presence of sunlight, to produce ATP and oxygen.

a. uses carbon dioxide and water, in the presence of sunlight, to produce food (glucose) and oxygen.

1. Photosynthesis a. uses the energy in sunlight to make food. b. uses the glucose in sunlight to make food. c. uses the energy in sunlight to make ATP. d. breaks down glucose to form ATP.

a. uses the energy in sunlight to make food.

8. The correct chemical formula for photosynthesis (in the presence of sunlight) is a. 6CO2 + 6O2 --> C6H12O6 + 6H2O. b. 6CO2 + 6H2O --> C6H12O6 + 6O2. c. C6H12O6 + 6O2 --> 6CO2 + 6H2O d. C6H12O6 + 6CO2 --> 6O2 + 6H2O

b. 6CO2 + 6H2O --> C6H12O6 + 6O2.

6. Which statement best describes the relationship between a consumer and a producer? a. A lion eating an antelope. b. A caterpillar eating a leaf. c. A snake eating a rat. d. A flower absorbing sunlight.

b. A caterpillar eating a leaf.

23. Which of the following correctly matches each of the inputs of the Calvin cycle with its role in the cycle a. CO2: high-energy electrons, ATP: energy, NADPH: oxidation b. CO2: carbon, ATP: energy, NADPH: high energy electrons c. CO2: high-energy electrons, ATP: carbon, NADPH: energy d. CO2: energy, ATP: carbon, NADPH: high energy electrons

b. CO2: carbon, ATP: energy, NADPH: high energy electrons

10. The correct sequence of events in the light reactions is a. absorption of sunlight, electrons flow down the electron transport chain, ATP is made, NADPH is made. b. absorption of sunlight, splitting of water, electrons flow down the electron transport chain, ATP is made. c. electrons flow down the electron transport chain, NADPH is made, ATP is made, water is split. d. absorption of sunlight, electrons flow down the electron transport chain, NADPH is made, water is split.

b. absorption of sunlight, splitting of water, electrons flow down the electron transport chain, ATP is made.

8. How do bacteria that live deep below the ocean's surface make food? a. by photosynthesis b. by chemosynthesis c. by cellular respiration d. They eat other organisms.

b. by chemosynthesis

22. The overall function of the Calvin cycle is a. capturing sunlight. b. making sugar. c. producing CO2 d. splitting water. e. oxidizing glucose.

b. making sugar.

25. Which of the following is not a product of the light reactions of photosynthesis? a. O2 b. sugar c. high-energy electrons d. ATP e. NADPH

b. sugar

17. The ultimate source of energy in the sugar molecules produced by photosynthesis is a. sugar. b. the sun. c. oxygen. d. ATP. e. chlorophyll.

b. the sun.

7. Which of the following statements is true? a. The products of photosynthesis are the reactants of cellular respiration. b. The products of cellular respiration are the reactants of photosynthesis. c. Both statements are true. d. Neither statement is true.

c. Both statements are true.

31. Oceanographers have suggested slowing the rate of greenhouse warming by fertilizing the ocean to increase the growth of algae. How would this reduce the greenhouse effect? a. It would produce oxygen, which reflects sunlight from the atmosphere. b. It would "repair" Earth's ozone layer. c. It would use CO2, which would otherwise trap heat in the atmosphere. d. It would change the color of the ocean, reflecting the sun's heat.

c. It would use CO2, which would otherwise trap heat in the atmosphere.

19. Which of these wavelengths is least useful for photosynthesis? a. blue b. yellow c. green d. orange e. red

c. green

11. The Calvin cycle occurs a. in the granum of the thylakoid membranes of the chloroplast. b. in the stroma surrounding the inner membrane of the chloroplast. c. in the stroma surrounding the thylakoid membranes of the chloroplast. d. in the granum inside the inner membrane of the chloroplast.

c. in the stroma surrounding the thylakoid membranes of the chloroplast.

30. The energy used to produce ATP in the light reactions of photosynthesis comes from a. the "burning" of sugar molecules. b. splitting water. c. movement of H+ through a membrane. d. carbon fixation. e. fluorescence.

c. movement of H+ through a membrane.

28. Certain bacteria use smelly hydrogen sulfide gas, H2S, instead of water, H2O, as a source of electrons and hydrogen for the light reactions of photosynthesis. If their method of photosynthesis is similar to plants in other ways, where do you think the sulfur would end up? a. sulfur dioxide, SO2 b. chlorophyll c. solid sulfur, S2 d. a sugar containing sulfur

c. solid sulfur, S2

20. When chloroplast pigments absorb light, ... a. they are reduced. b. they lose potential energy. c. their electrons become excited. d. the Calvin cycle is triggered. e. their photons become excited.

c. their electrons become excited.

4. Which of the following statements is true about glucose and ATP? (1) Glucose is made during photosynthesis. (2) The energy in sunlight is temporarily stored in glucose before it is transferred to ATP. (3) ATP is the energy-carrying molecule that cells use for energy. (4) The processes that make ATP and glucose also recycle oxygen in Earth's atmosphere. a. statement 1 only b. statements 2 and 3 only c. statements 1, 2, and 3 only d. All 4 statements are correct.

d. All 4 statements are correct.

2. Which of the following autotrophs is also a producer? a. a maple tree b. the blue-green bacteria known as cyanobacteria c. Laurencia, a marine genus of Red Algae from Hawaii. d. All of the above are producers.

d. All of the above are producers.

27. A plant is placed in a sealed greenhouse with a fixed (unchanging) supply of water, soil, and air. After a year, the plant weighs 5 kg more than at the start of the experiment, and the _____ weighs almost 5 kg less. a. soil in the pot b. water left in the room c. organic matter in the soil d. air in the room e. soil in the pot together with the water in soil

d. air in the room

24. The main photoautotrophs in aquatic environments are a. plants and animals. b. plants and fungi. c. animals and algae. d. algae and bacteria. e. plants and bacteria.

d. algae and bacteria.

15. The Calvin cycle a. starts with the molecule RuBP. b. uses the energy in ATP and NADPH from the light reactions. c. turns twice to produce one molecule of glucose. d. all of the above

d. all of the above

9. Most autotrophs make "food" through the process of a. cellular respiration. b. chemosynthesis. c. homeostasis. d. photosynthesis.

d. photosynthesis.

21. The light reactions of photosynthesis generate high-energy electrons, which end up in _______. The light reactions also produce ______ and _______ . a. ATP. . . NADPH . . . O2 b. O2, . . sugar. . . ATP c. chlorophyll. . . ATP . . . NADPH d. water. . . sugar. . . O2 e. NADPH... ATP... O2

e. NADPH... ATP... O2