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 Follow QuizMoz on Twitter  Photosynthesis Quiz III

Welcome to the QuizMoz Photosynthesis Quiz III. QuizMoz offers one of the Internet's largest collection of quizzes for you to tease your brain and pit your wits against the experienced QuizMoz quiz masters. Go ahead and find out what you know about yourself and the world around you. Best of luck!!

The Photosynthesis Quiz III tests your knowledge about carbon fixation and the photosystems involved in the light-independent reactions of photosynthesis.
1. What do the light-independent reactions require for synthesis?
a.CO2 for carbon and oxygen
b.ATP for reaction energy
d.NADPH for reducing power
e.A,B & D
2. Before CO2 can be used in synthesis by the light-independent reactions it must:
a.Diffuse into air spaces in the leaf
b.Diffuse into the stroma
c.Become "fixed"
d.Attach to ribulose biphosphate
3. Which of the following occur in one cycle of the Calvin-Benson cycle?
a.Six CO2 molecules are fixed
b.Only two ATP are used
c.Only four ATP are used
d.One six-carbon sugar phosphate is formed
4. Which of the following are intermediates in the Calvin-Benson cycle?
a.Nitroglycerate (NGA)
b.Nitroglyceraldehyde (NGAL)
c.Phosphoglycerate (PGA)
d.Phosphoglyceraldehyde (PGAL)
5. How much energy and reducing power is needed for one cycle of the Calvin-Benson cycle?
a.12 ATP and 12 NADPH
b.12 ATP and 18 NADPH
c.18 ATP and 12 NADPH
d.18 ATP and 18 NADPH
6. What are the final storage form(s) of the sugar phosphates formed in the light-independent reactions?
7. Light-independent reactions are also known as "dark" reactions because they can only occur at night.
8. In C4 plants, instead of the first stable intermediate being phosphoglycerate (PGA) it is:
c.Ribulose biphosphate
9. Oxygen can attach to ribulose biphosphate (RuBP) when there is low CO2 in the cells which results in slower growth for the plant.
10. What are succulents which avoid losing water in arid environments by only opening their stomata and fixing CO2 during the night?
a.CAM plants
b.C3 plants
c.C4 plants
d.C5 plants
11. Which of the following type of plant metabolism would lead to the fastest plant growth?
d.It depends on environmental conditions
12. How do C4 plants maintain adequate CO2 even when their stomata are tinier than those of C3 plants?
a.They switch from fixing CO2 to fixing acetate
b.They change pigment type
c.They fix CO2 twice instead of once
d.They have two types of photosynthetic cells
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What others think about Photosynthesis III
By: Kilo on Jan 10, 2011
  Good job guys the quiz is great
By: John Stanleymeyer on Mar 25, 2009
  I find it easy 'cause I took up a botany class. Fortunately!
By: jane on Feb 20, 2009
  Photosynthesis is crazy..... so complicating
By: Nat on Oct 8, 2008
  9. Different end products occur under different conditions. When light intensity and CO2 concentrations are high – sugars and starch are formed. When they are low, amino acids are formed.

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