Biology (Raven), 10th Edition

Chapter 8: Photosynthesis

Post-Test

1
The NADPH required for CO2 fixation is formed
A)by the reduction of oxygen.
B)by the hydrolysis of ATP.
C)during the light reactions.
D)only in C4 plants.
E)in the mitochondria.
2
Which of the following is NOT a process of the Calvin Benson Cycle?
A)for every "turn" of the cycle, with one CO2 fixed, the CO2 acceptor is regenerated.
B)CO2 combines with RuMP forming 3PG.
C)one-sixth of the G3P is used to make sugars.
D)five-sixths is processed in the complex reactions that produce RuMP.
E)3PG is reduced to G3P in a two-step reaction requiring ATP and NADPH + H+.
3
In C3 photosynthesis,
A)PEP is the primary CO2 acceptor.
B)there are two classes of chloroplasts.
C)the photosynthetic cells of the leaf are mesophyll and bundle sheath.
D)extensive photorespiration is possible.
E)the first product of CO2 fixation is a 4-carbon compound.
4
Light reactions and the Calvin Benson cycle occur in the
A)stroma.
B)chloroplasts.
C)cell wall.
D)mitochondria.
E)thykaloids.
5
Which of the following is true about photorespiration?
A)takes place only in C4 plants.
B)includes reactions carried out in peroxisomes.
C)increases the yield of photosynthesis.
D)is catalyzed by PEP carboxylase.
E)is independent of light intensity.
6
Which analogy best fits the concept of a "photosystem"?
A)An "up" escalator beside a "down" escalator.
B)A windmill that harnesses the energy from moving air to turn a wheel.
C)A basketball team which passes the ball to a well-positioned player, who can then gain points for the team.
D)The sound that comes from a compact disc.
E)A contraption which converts sound into the physical movement of a mechanical arm, which then pushes a button.
7
Which isotope was instrumental in determining that water is split during light reactions?
A)3H
B)18O
C)14C
D)32S
E)Two of the above isotopes were valuable for that information
8
The analysis of bacterial density growing in a spectrum of light separated with a prism onto an algal filament can allow us to create an action spectrum of photosynthesis. In this experiment, the amount of photosynthesis that can occur with different colors of light is measured because the bacteria
A)are attracted to oxygen released from the algae as it photosynthesizes.
B)migrate to areas with high sugar due to photosynthetic efficiency.
C)prefer areas that have less light.
D)help the plant through endosymbiotic assistance.
E)provide shade which converts the light into "particles" which are more easily handled by the algae's pigments.
9
Which of these is the ultimate origin (donor) of electrons that are passed along through activities in the reaction center during photosynthesis?
A)Water
B)Hydrogen
C)Carbon
D)Photons
E)Oxygen
10
Which ATP-generating event in photosynthesis is most similar to the one found in mitochondria?
A)Oxidation of organic molecules
B)Chemiosmosis
C)Pumping of protons from one side of a membrane to another
D)Absorption of high-energy photons
E)Use of oxygen to thermodynamically drive an exergonic reaction.
11
The enzyme responsible for fixation of CO2 (and which, interestingly, is also the most abundant enzyme on Earth!) is called
A)Ribulose decarboxylase
B)Ribulose bisphosphate
C)Ribulose catalase
D)Ribulose bisphosphate decarboxylase
E)Ribulose bisphosphate carboxylase
12
CAM plants use a(n) ________ method to avoid photorespiration while C4 plants use a(n) __________ separation of ribulose bisphosphate carboxylase and oxygen.
A)Spatial (anatomy-based) - isomer-based
B)Temporal (time-based) - organic
C)Temporal - spatial
D)Spatial - temporal
E)Organic - isomer-based
13
Which of these is NOT a product of photosynthesis:
A)ATP
B)NADPH
C)FADH2
D)O2
E)NADH
14
The formation of organic molecules from carbon dioxide occurs as a result of
A)oxidation reactions.
B)reduction reactions.
C)hydrolysis.
D)condensation.
E)dehydration synthesis.
15
What is the purpose of the C-H rich hydrocarbon tail of chlorophyll?
A)It is easily oxidized to provide energy to the cell
B)It acts as a conjugated ring system to stabilize the pigment through resonance
C)It supports magnesium in its centre as a site for electron withdrawal
D)The nonpolar covalent bonds in the tail provide easy access to electrons
E)It can help anchor the pigment to the thylakoid membrane
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