Chapter 10 Homework – Flashcards
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When oxygen is released as a result of photosynthesis, it is a direct by-product of _____.
When oxygen is released as a result of photosynthesis, it is a direct by-product of _____.
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splitting water molecules
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Chlorophylls absorb most light in which colors of the visible range?
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Blue and Red
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What event accompanies energy absorption by chlorophyll (or other pigment molecules of the antenna complex)?
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An electron is excited.
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The proteins of the electron transport chain active in the light-dependent reactions _____.
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Are membrane proteins present in the thylakoid
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As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy?
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It is used to establish and maintain a proton gradient.
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Plastoquinone (PQ), an electron carrier of small molecular weight, is found in the electron transport chain associated with photosystem II. If PQ is not directly anchored to other membrane or cytoplasmic structures, it is probably _____.
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Both lipid soluble and a molecule that serves as a shuttle between photosystem II and the cytochrome complex
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The electrons of photosystem II are excited and transferred to electron carriers. From which molecule or structure do the photosystem II replacement electrons come?
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Water
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What is the main purpose of light-dependent reactions of photosynthesis?
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To produce NADPH and ATP
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Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will most directly affect the _____.
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Synthesis of ATP
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How are the light-dependent and light-independent reactions of photosynthesis related?
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The products of light-dependent reactions are used in light-independent reactions.
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Light reaction inputs
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Light
Water
NADP+
ADP
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Light reaction outputs
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NADPH
ATP
O2
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Not an input or output of light reactions
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Glucose
CO2
G3P
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Calvin cycle inputs
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ATP
NADPH
CO2
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Calvin cycle outputs
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ADP
NADP+
G3P
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Not an input or output of calvin cycle
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O2
Glucose
Light
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In the light reactions, light energy is used to oxidize _________ to __________.
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H20
O2
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The electrons derived from this oxidation reaction in the light reactions are used to reduce ________ to _______ .
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NADP+
NADPH
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The Calvin cycle oxidizes the light-reactions product _________ to _______.
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NADPH
NADP+
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The electrons derived from this oxidation reaction in the Calvin cycle are used to reduce ________ to _______ .
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CO2
G3P
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Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
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The light reactions provide ATP and NADPH to the Calvin cycle, and the Calvin cycle returns ADP, i, and NADP+ to the light reactions.
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A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Since the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed.
If the power fails and the lights go dark, CO2 levels will _____.
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Rise as a result of both animal and plant respiration
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How is energy transferred from the reaction center to the electron acceptor?
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Redox reactions
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Why is chlorophyll green?
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It absorbs wavelengths in only the blue and red parts of the visible spectrum.
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Why is it not entirely accurate to adopt the common phrase "light-independent reactions" when referring to the Calvin cycle?
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Although its reactions are not triggered directly by light, they depend on the products of light-capturing reactions.
