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

They become building blocks for plant compounds

They are broken down for energy

What provides the energy for the Calvin cycle reactions?

Products from light-dependent reactions

What happens to the remaining 3-carbon molecules in the Calvin cycle?

They are converted back to 5-carbon molecules

What role does NADPH play in the Calvin cycle?

It provides high-energy electrons

What compounds can plants synthesize from Calvin cycle products?

Lipids, proteins, and complex carbohydrates

How is the gradient across the thylakoid membrane described?

Strongly positive inside, negative outside

Neutral inside, positive outside

Negative inside, positive outside

Weakly positive inside and outside

What is the relationship between light-dependent and light-independent reactions?

They work together in energy transfer

They occur independently of each other

They occur in different organisms

How do other organisms benefit from the Calvin cycle in plants?

They consume the energy-rich compounds

They directly use the ATP produced

They absorb the oxygen released

They utilize the carbon dioxide

What happens to the carbon dioxide used in the Calvin cycle?

It is incorporated into plant compounds

It is released back into the atmosphere

The thylakoid membrane contains a protein called ATP synthase. As hydrogen ions pass through the protein, ADP and a phosphate group are combined to form ATP. What is the direct energy source, if any, for the movement of hydrogen ions and the formation of ATP?

The energy source is the concentration difference of hydrogen ions across the membrane.

The energy source is the high-energy electrons that accompany the hydrogen ions.

The energy source is a set of ATP molecules that gather inside the thylakoid.

There is no energy source; the process occurs without an energy input.

The graph shows how the rates of photosynthesis vary with light intensity for two groups of plants: plants that thrive in direct sunlight, and plants that thrive in the shade. The plants in both groups receive the same amount of water and are kept at the same temperature. For both groups of plants, what best describes the relationship between light intensity and rate of photosynthesis?

The rate of photosynthesis increases with light intensity, and might be limited by other factors such as water and temperature.

The rate of photosynthesis increases with light intensity, and it increases without limit.

The rate of photosynthesis is independent of light intensity, but may be limited by other factors such as water and temperature.

The rate of photosynthesis is at a maximum over a narrow range of light intensities.

Briana is studying a model of the light-dependent reactions of photosynthesis. The diagram shows a part of this model. Briana notices the electrons that the water molecules release. She asks, “Will the electrons build up in the chloroplast?” Which addition to the diagram would be most useful for answering Briana’s question?

an arrow that shows the electrons moving through electron carriers, and being received by NADP +

a wavy arrow that shows Photosystem 1

an equation for the chemical reaction that forms water from hydrogen ions, electrons, and oxygen molecules

an equation for the chemical reaction that forms hydrogen gas from hydrogen ions and electrons _______

6. During the light-independent reactions of photosynthesis, carbon dioxide is combined with hydrogen to form sugars. What is the energy source, if any, that allows this process to occur?

The energy source is ATP from the light-dependent reactions.

The energy source is high-energy bonds in sugar molecules.

The energy source is ATP from processes that occur in other organelles of the cell.

No energy source is used; the process occurs without an energy input.

When the light-independent reactions are occurring, gases diffuse between the chloroplast and the air that surrounds the plant. Why is gas diffusion essential during this stage of photosynthesis?

d. Water vapor is released as a waste product.

a. Water vapor is used to assemble sugar molecules.

b. Carbon dioxide is used to assemble sugar molecules.

c. Molecular oxygen is used to assemble sugar molecules.

8. Although animals do not perform photosynthesis, their food supply depends on the sugars that photosynthesis produces. What is the other significant benefit to animals that photosynthesis provides?

adding oxygen to the atmosphere

removing water from the environment

adding carbon dioxide to the atmosphere

Betel is developing a model of the process of photosynthesis. One of her goals is to identify the products of photosynthesis that will later be used to assemble sugars, lipids, amino acids, and other essential compounds for the organisms. In which part of the model should these products be identified?

in the light-independent reactions, where 3-carbon sugars exit the cycle

in the light-dependent reactions, where water molecules are split

in the light-dependent reactions, where ATP is synthesized

in the light-independent reactions, where carbon dioxide enters the cycle

Explain how sunlight is utilized in the process of photosynthesis.

Sunlight is converted into chemical energy stored in glucose.

Sunlight directly splits water molecules into hydrogen and oxygen.

Sunlight is used to transport nutrients in the plant.

Sunlight is stored as ATP in the plant cells.

04.3 Text B

Quiz

•

Biology

•

9th - 12th Grade

•

Practice Problem

•

Medium

•

NGSS

HS-LS1-6, HS-LS2-5, HS-LS1-5

+2

Standards-aligned

Zachary Carousso

Used 1+ times

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04.3 Text B

29 questions

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

Where do hydrogen ions accumulate during photosystem II?

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

Which products are formed during the light-dependent reactions?

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

What is the first step in the Calvin cycle?

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

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

What provides the energy for the Calvin cycle reactions?

What is the end product of the Calvin cycle?

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