ADVANCED/HONORS BIOLOGY
Name ________________ Date _____
PHOTOSYNTHESIS INTERNET WORKSHEET
http://www.wiley.com/legacy/college/boyer/0470003790/animations/photosynthesis/photosynthesis.htm
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Energy for all living things ultimately comes from the _________.
What are the reactants in photosynthesis?
What is the by-product?
From the photosynthetic reaction, what are the uses of the following?
Oxygen –
Carbon –
NADPH –
ATP –
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What part of the water molecule is used during photosynthesis?
Is carbon dioxide reduced or oxidized during photosynthesis?
Is water reduced or oxidized during photosynthesis?
What compounds are affected by photons of light?
What type of waves are the shortest?
The longest?
At what wavelength would you find yellow light?
What happens to the electrons of the pigments?
12. What three things could happen to an excited pigment molecule?
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b.
c.
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There are two stages of photosynthesis: ________________ & _____________________In the light reaction, what is oxidized?
What are the two products of the light reactions?
How does electron flow compare between photosynthesis and cellular respiration?
17. Can the dark reactions occur during the daytime?
18.What substances need to be present in order for the dark reactions to occur?
19. The dark reaction is also called the “________________________”.
20. How do the mitochondria and chloroplast compare? Complete the table below.
Mitochondria
Chloroplast
Number per cell
Size
function
21. Move your cursor over the chloroplast. What is the function of the thylakoid?
22. What is the function of the stroma?
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How is chlorophyll b different from chlorophyll a?
Magnesium is in the center of the chlorophyll molecule. What is the area called where the Mg is found?
What happens in this area?
What is the opposite end of the chlorophyll molecule made up of?
What does it do?
What are the other accessory pigments and their colors?
29. Why are they not visible most of the time?
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Which compound is the oxidized form of water as a result of photosynthesis?
Which molecule is produced by photosynthesis to serve as a source of reducing power for biosynthesis?
Which compound directly absorbs light?
Which region contains enzymes that convert carbon dioxide to carbohydrates?
What is a photosystem?
35. Where do the excited electrons finally end up in the photosystem?
36. What is the Z-scheme?
37. How is a photosystem like a pinball machine?
38. In photosystem I, (P700) how is the energy of the electrons finally harassed?
39. As the electrons are sent down the electron transport chain, what type of gradient is set up?
40. What fills in the hole created by the excited electron going down the electron transport chain in the
reaction center of P700?
41. How is P680 different from P700?
42. What fills in the hole created by the excited electron going down the electron transport chain in the
reaction center of P680?
43. What happens if more ATP is needed by the cell and NADPH levels are sufficient?
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What is the pH difference between the thylakoid space and the stroma?
Which region contains the ATP produced by photophosphorylation?
If photophosphorylation is prevented in the leaf of a green plant, can ATP still be synthesized?
Define Calvin cycle.
48. The key molecule in carbon fixation is RuBP or ___________________________________.
49. The enzyme that is responsible for this reaction is _________________________________.
50. How do the steps of the Calvin cycle relate to glycolysis?
51. What are the three possible fates of the intermediate made in the Calvin cycle?
a.
b.
c.
52. How many of the intermediate molecules are converted back to RuBP?
53. The net reaction of 6 CO2 plus 3 RuBP yields: ___________________ & ________________
54. How many NADPH and ATP are used to do this?
55. What do plant leaves do when it is hot and dry?
56. In low levels of CO2, what does rubisco do?
57. What is this called?
58. What types of plants use an alternate method to fix carbon dioxide?
59. What is this alternate method called?
60. Why does this take place in bundle sheath cells?
61. What reaction scheme directly contributes electrons to NADP+ to form NADPH?
62. How many of the following are consumed for every 6 molecules of CO2 that enter the Calvin cycle?
NADPH ____________ ATP____________
63. Photorespiration results in a _________% decrease in the amount of carbohydrate production.