BSCS Biology: A Molecular Approach

Chapter 4: Autotrophy: Collecting Energy from the Nonliving Environment

Chapter Test

1.
Bacteria that use CO2 as their source of carbon and oxidize inorganic substances to obtain energy are known as ____.
A)photoautotrophs
B)photoheterotrophs
C)chemoautotrophs
D)chemoheterotrophs
2.
What do photoautotrophic cells use to absorb visible light?
A)pigments
B)stroma
C)thylakoids
D)grana
3.
The reactions that produce PGAL are represented by which part of the figure?

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A)chemical energy transfer
B)light reactions
C)water oxidation
D)the Calvin cycle
4.
What are the forms of chemical energy created during photosynthesis before the Calvin cycle?
A)ATP and NADPH
B)ADP and NADPH
C)ATP and NADP+
D)ADP and NADP+
5.
Why does the Calvin cycle not operate at night?
A)not enough O2 is available
B)not enough CO2 is available
C)not enough H2O is available
D)not enough NADPH is available
6.
C3 plants tend to grow best between which of the following temperature ranges?
A)5° C to 15°C
B)15° C to 25°C
C)20° C to 30°C
D)35° C to 45°C
7.
What element can interfere with carbon fixation?
A)carbon
B)oxygen
C)hydrogen
D)nitrogen
8.
What is a primary difference between C3 and C4 plants?
A)C3 plants process carbon dioxide only, while C4 plants process carbon dioxide and oxygen.
B)C3 plants have one system of carbon fixation, while C4 plants have two systems of carbon fixation.
C)C3 plants perform photosynthesis, while C4 plants perform photorespiration.
D)C3 plants use mesophyll cells to supply rubsico, while C4 plants use mesophyll cells to supply PGA directly to the plant.
9.
Which of the following provides the most energy?
A)heterotrophy
B)chemosynthesis
C)photosynthesis
D)entropy
10.
How do chemoautotrophs help plants?
A)They oxidize nitrate ions to nitrite ions, which plants use.
B)They oxidize ammonium ions to nitrates, which plants use.
C)They oxidize sulfuric acid so that it cannot damage plants.
D)They oxidize copper to provide cupric ions to plants.
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