Chapter 5 BIO

It will reduce it because less carbon dioxide will be available

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

the conversion of CO2 to an organic compound

10. Which statement correctly describes carbon fixation?

G3P

11. What is the molecule that leaves the Calvin cycle to be converted into glucose?

12 To convert solar energy into chemical energy that cells can use to do work.

12. What is the overall purpose of the light reactions in photosynthesis?

Because lions eat animals that eat plants.

13. Why are carnivores, such as lions, dependent on photosynthesis to survive?

14 The energy is present initially as light. A photon of light hits chlorophyll, causing an electron to be energized. Answer Key 599 The free electron travels through the electron transport chain, and the energy of the electron is used to pump hydrogen ions into the thylakoid space, transferring the energy into the electrochemical gradient. The energy of the electrochemical gradient is used to power ATP synthase, and the energy is transferred into a bond in the ATP molecule. In addition, energy from another photon can be used to create a high-energy bond in the molecule NADPH.

14. Describe the pathway of energy in light-dependent reactions.

It wouldn't happen at all. RuBisCO is necessary in fixing carbon dioxide. It catalyzes the reaction between carbon dioxide and RuBP at the start of the cycle.

15. Which part of the Calvin cycle would be affected if a cell could not produce the enzyme RuBisCO?

16 Photosynthesis takes the energy of sunlight and combines water and carbon dioxide to produce sugar and oxygen as a waste product. The reactions of respiration take sugar and consume oxygentobreak it downinto carbon dioxide andwater,releasing energy.Thus,the reactants ofphotosynthesis are the products of respiration, and vice versa.

16. Explain the reciprocal nature of the net chemical reactions for photosynthesis and respiration.

glucose and oxygen

2. What two products result from photosynthesis?

Thylakoids exist as a maze of folded membranes.

3. Which statement about thylakoids in eukaryotes is not correct?

Chlorophyll

6. Which molecule absorbs the energy of a photon in photosynthesis?

splitting water molecules

7. Plants produce oxygen when they photosynthesize. Where does the oxygen come from?

green

8. Which color(s) of light does chlorophyll a reflect?

Stroma

9. Where in plant cells does the Calvin cycle take place?

eating other organisms

4. From where does a heterotroph directly obtain its energy?

Energize an electron

5. What is the energy of a photon first used to do in photosynthesis?