Concept 4 Photosynthesis

What are the three parts of an ATP molecule?

• adenine, thylakoid, and a phosphate group
• stroma, grana, and chlorophyll
• adenine, ribose, and three phosphate groups
• NADH, NADPH, and FADH₂

Use the diagram to answer the question. Between which parts of the molecule must the bonds be broken to form an ADP molecule?

• A and B
• A and C
• B and C
• C and D

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Most plants appear green because chlorophyll

• absorbs green light.
• absorbs violet light.
• does not absorb green light.
• does not absorb violet light.

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Where in the chloroplast is chlorophyll found?

• in the ATP
• in the stroma
• in the thylakoid membrane
• in the thylakoid space

Use the diagram to answer the question. Which chemical is an electron carrier molecule?

• H₂O
• carbon dioxide
• NADP⁺
• oxygen

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NGSS.HS-LS1-5

What makes certain molecules good electron carriers?

• They can accept electrons and transfer most of their energy to another molecule.
• They are very large molecules, so they have lots of room to carry many electrons.
• They can absorb sunlight, which is where all of the high-energy electrons come from.
• They are carbohydrates and have a lot of energy, which allows them to carry electrons.

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Why are electron carriers needed for transporting electrons from one part of the chloroplast to another?

• High-energy electrons would be destroyed.
• High-energy electrons are highly reactive.
• High-energy electrons are not soluble in cytoplasm.
• High-energy electrons get their energy from electron carriers.

A student is collecting the gas given off from a plant in bright sunlight at a temperature of 27°C. The gas being collected is probably

• oxygen
• carbon dioxide
• ATP
• glucose

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NGSS.HS-LS1-5

NGSS.HS-LS2-5

Use the diagram to answer the question. Why might the candle in jar A burn longer than the candle in jar B?

• Carbon dioxide produced by the plant allows the candle to burn longer.
• Chlorophyll produced by the plant allows the candle to burn longer.
• Glucose produced by the plant allows the candle to burn longer.
• Oxygen produced by the plant allows the candle to burn longer.

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If carbon dioxide is completely removed from a plant’s environment, what would you expect to happen to the plant’s production of high-energy sugars?

• More sugars will be produced.
• No sugars will be produced.
• The same number of sugars will be produced but without carbon dioxide.
• Fewer sugars will be produced at first, but then the plant will recover.

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NGSS.HS-LS1-5

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