Chapter 10 Review Sheet Photosynthesis

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Biol 1406, Instructor: Alice Zhou
Updated 4/18/12

Chapter 10: Photosynthesis

1. Describe the energy transformation that occurs in photosynthesis. Solar energy to chemical energy specifically stored in sugar. SolarChemical energy (sugar)

2. Write the summary equation of photosynthesis.
Solar + 6CO2 +6H2O C6H12O6+6O2
(simple)Complex

3. Photosynthesis produces organic sugar molecules. Where does the carbon come from in making the sugars? From carbon dioxide

4. Aerobic cellular respiration is catabolic, exergonic and oxygen requiring. What about photosynthesis? Anabolic, endergonic, O2-releasing

5. What is the difference between autotrophs and heterotrophs? Autotrophs create their own food by photosynthesis heterotrophs don’t.

6. Name some photoautotrophs.
Plants
Algae
Photosynthetic Bacteria

7. Draw and label these parts of chloroplasts: thylakoid, granum, stroma, outer and inner membrane.

8. What type of cells in a plant will contain chloroplast? What type of cells contain mitochondria and why?

Every single plant cell will have mitochondria, some plant cells only the green ones will contain chloroplasts.

9. The Nature of Light and Pigments
a. What wavelength range is the source of light for photosynthesis? Gamma X-RaysU.VVisible (VIBGYOR: ROYGBIV backwards)Infrared Radio
Small wavelength350nm750nmWavelength
b. What are photons?
* Massless
* Carry fixed amount of energy (packet of energy)
* Travels at speed of light

c. What are pigment molecules?
Selectively absorbing visible light (chemical) -350-450nm

d. Name three types of photosynthetic pigments found in green plants. Note which one is the main one, which ones are accessory pigments. * Chlorophyll A (MAIN)
* Chlorophyll B (minor %)
* Carotenoid (minor %)

e. What makes chloroplasts or leaves green and why?
Green is being reflected because it is not absorbed.

f. How can you easily separate them out experimentally? Paper Chromatography

g. Plot an absorption spectrum of chlorophyll a. Be sure to use correct parameters on x and y axis.

10. Organization of pigments in photosystems.

a) What is the concept of a photosystem?

b) Photosystems are organized into two subcomponents: * antenna complex:
Lots of pigments (A, B, and carotenoids)
Pigments along with some proteins
that organize some pigments about
200 found, scaffold proteins

* reaction center complex
A pair of chlorophyll A are found proteins are organized and shape reactions. PEA are bound here.

* (T/F?) In either complex, membrane proteins are present to anchor and support the functions of pigment and other organic molecules.

11. Light interacts with pigments
h. When photons strike the pigment molecules in the chloroplast, what immediately happens?_ Photoexcitation_____. After that, what can happen to the electrons in the photosystem? Describe two outcomes in diagrams.

Electrons fall back to ground state
Electrons transferred to PEA
Electrons fall back to ground state
Electrons transferred to PEA

i. In outcome 1, electrons fall back to ground state. Inductive resonance: energy of the excited electron, but not the electron itself, is transferred to a neighboring pigment molecule, exciting the second pigment molecule. Very little energy is lost in this ENERGY transfer.

j. In outcome 2, electrons are transferred to PEA (Primary Electron Acceptor): _________ reaction has occurred. The pigment molecule that has lost the electrons is___________, whereas the PEA is reduced because it gains an electron. This actually happens to two chlorophyll a pigments (RCCA) located at reaction center in a photosystem.

k. Draw a diagram of photosystem to illustrates both outcomes as photons interact with pigments:

12. Light reactions...
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