AP Biology Photosynthesis Article

What is the primary function of the light reactions of photosynthesis?

• To produce glucose
• To produce NADPH and ATP
• To use ATP
• To produce RuBP

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What supplies the electrons that are lost in PS I?

• the electrons from PS II
• water
• glucose
• oxygen

What is the function of NADP+?

• It absorbs light
• It is an electron carrier
• It is a light-reflecting pigment
• It acts as long-term energy storage

Green plants reflect ________ light.

• Red
• Green
• All
• Red and Violet

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The light reactions occur in the ________ and the dark reactions take place in the ________.

• Chloroplast / thylakoid membrane
• stroma / thylakoid
• mesophyl / stomata
• thylakoid membrane / stroma

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Where does the carbon come from that is used to form glucose?

• The soil
• CO₂ in the air
• From other carbohydrates
• Calvin Cycle

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Where is glucose synthesized

• Photosystem II
• Photosystem I
• Calvin Cycle
• Glycolysis

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When oxygen is released as a result of photosynthesis, it is a direct by-product of

• reducing NADP+
• splitting water molecules
• chemiosmosis
• electron transfer in photosystem II and I

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How many sugar molecules are produced from every six molecules of carbon dioxide that enter the Calvin cycle?

• 1
• 3
• 6
• 12

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The H+ concentration gradient is used to 

• make NADPH
• split a water molecule
• generate ATP
• form water

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