04.3 Text B

What is the primary function of ATP synthase in the thylakoid membrane?

• To split water molecules
• To rotate and produce ATP from ADP and phosphate
• To transport electrons through the membrane
• To produce NADPH directly

Where do hydrogen ions accumulate during photosystem II?

• In the stroma
• In the cytoplasm
• In the thylakoid space
• In the cell wall

What provides the energy for ATP synthesis in the thylakoid membrane?

• Direct sunlight
• The electron transport chain
• The concentration gradient of H+ ions
• The Calvin cycle

Which products are formed during the light-dependent reactions?

• Carbon dioxide and water
• Glucose and oxygen
• ADP and NADP+
• ATP and NADPH

Why can't ATP and NADPH serve as long-term energy storage molecules?

• They are too large
• They are unstable after a few minutes
• They contain too much energy
• They are used up too quickly

What is the first step in the Calvin cycle?

• Production of 5-carbon compounds
• Combination of CO2 with 5-carbon compounds
• Formation of 3-carbon compounds
• Synthesis of glucose

How many carbon dioxide molecules are needed to complete one Calvin cycle?

• Three
• Four
• Five
• Six

What happens to the two 3-carbon molecules removed at midcycle?

• They are broken down for energy
• They become building blocks for plant compounds
• They are converted back to CO2
• They form ATP

What provides the energy for the Calvin cycle reactions?

• Direct sunlight
• Products from light-dependent reactions
• Carbon dioxide
• Water molecules

What is the end product of the Calvin cycle?

• Oxygen gas
• Carbon dioxide
• A 6-carbon sugar molecule
• ATP

Tags

NGSS.HS-LS1-6