Chapter 5 Review Questions

7. Plants produce oxygen when they photosynthesize. Where does the oxygen come from? A. splitting water molecules B. ATP synthesis C. the electron transport chain D. chlorophyll

A. splitting water molecules

10. Which statement correctly describes carbon fixation? A. the conversion of CO2 to an organic compound B. the use of RuBisCO to form 3-PGA C. the production of carbohydrate molecules from G3P D. the formation of RuBP from G3P molecules E. the use of ATP and NADPH to reduce CO2

A. the conversion of CO2 to an organic compound

11. What is the molecule that leaves the Calvin cycle to be converted into glucose? A. ADP B. G3P C. RuBP D. 3-PGA

B. G3P

3. Which statement about thylakoids in eukaryotes is not correct? A. Thylakoids are assembled into stacks. B. Thylakoids exist as a maze of folded membranes. C. The space surrounding thylakoids is called stroma. D. Thylakoids contain chlorophyll.

B. Thylakoids exist as a maze of folded membranes. (This statement about thylakoids is not correct. The thylakoid membranes look like a stack of coins and the compartments are connected like the maze of chambers).

5. What is the energy of a photon first used to do in photosynthesis? A. split a water molecule B. energize an electron C. produce ATP D. synthesize glucose

B. energize an electron

8. Which color(s) of light does chlorophyll a reflect? A. red and blue B. green C. red D. blue

B. green

6. Which molecule absorbs the energy of a photon in photosynthesis? A. ATP B. glucose C. chlorophyll D. water

C. chlorophyll

4. From where does a heterotroph directly obtain its energy? A. the sun B. the sun and eating other organisms C. eating other organisms D. simple chemicals in the environment

C. eating other organisms

2. What two products result from photosynthesis? A. water and carbon dioxide B. water and oxygen C. glucose and oxygen D. glucose and carbon dioxide

C. glucose and oxygen

9. Where in plant cells does the Calvin cycle take place? A. thylakoid membrane B. thylakoid space C. stroma D. granum

C. stroma

1. Figure 5.7 On a hot, dry day, plants close their stomata to conserve water. What impact will this have on photosynthesis?

Levels of carbon dioxide (a reactant) will fall, and levels of oxygen (a product) will rise. As a result, the rate of photosynthesis will slow down.