Which of the following correctly identify a role of the ATP produced in the light-capturing reactions? Select True or False for each statement. T/F It is used by rubisco to fix CO 2 to RuBP. T/F It serves the same role as ATP produced by mitochondria. T/F It is used to regenerate RuBP from G3P molecules. T/F It is used to produce G3P molecules

Hello everyone. Let's look at our next problem. It says both A. T. P. And N A. D N A. D. P. H. Two produced during the light reactions are and let's look over our choices real quick. We've got a sources of energy for the Calvin cycle. Be used in the Calvin cycle to convert carbon dioxide into sugar. C. Both A and B and D. None of these. So here's an example of why it's good to look over your answer choices first because we see we have one choice that involves both A and B. Being correct and one choice that involves none of the answers being correct. So, always good to know that that is a possibility. So let's think about our light reactions and A. T. P and N. A. D. P. H. Two that are produced. Well, both of those are high energy molecules um A T. P of course being the ultimate high energy molecule. Even more so than N A D. P. H two. And in those light reactions of photosynthesis, they essentially harness energy from sunlight and then the energy stored in A. T. P and N A. D. P. H. Two is used in the Calvin cycle in those steps that need the input of energy. So choice A sources of energy for the Calvin cycle is correct. I'm not going to pick that as my answer because I know that one option is that both A and B. Are correct. Little dots show that it is correct. So then let's think about choice be used in the Calvin cycle to convert carbon dioxide into sugar. When we think about the fixation of carbon dioxide in the Calvin cycle. Remember from our content video that carbon dioxide combines with the five carbon molecule R U B p. It produces a brief six carbon intermediate which ends up breaking into 23 carbon molecules called three P. G. A. Or phosphate glycerin. It well, we then use A. T. P. So I'll start with three P G. A. Here we consume A T. P. Oops. Yeah, about that. A T. P. And it don't gives a phosphate to this three P G A. To become 13 B p G A. Or 13 This phosphor glass rate. So we've used up a molecule of A T. P. And then this 1 3. This fossil glass right, is reduced by N A D ph two to become G three P or glycerol to hide three phosphate. This is a three carbon molecule and we'll end up after another turn of the Calvin cycle, Becoming the six carbon sugar, glucose. So we see in that pathway from carbon dioxide to be converted into glucose. We actually are using up some 80 P and some N A D. P H two in the steps of that cycle, converting carbon dioxide into sugar. So B is also correct. So A and B. Are both correct. So C. Is our correct answer. Obviously D none of these cannot be our answer. So that gets crossed out and then A and B are crossed out, since we have the option of C, both A and B. So again, both 80 P and N A D p H two produced during light reactions are see both A and B. There are sources of energy for the Calvin cycle, and they're also used in the Calvin cycle, converting carbon dioxide into sugar. See you in the next video.

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9. Photosynthesis

Light Reactions of Photosynthesis

General Biology

9. Photosynthesis

Light Reactions of Photosynthesis

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4:38 minutes

Problem 8

Textbook Question

Which of the following correctly identify a role of the ATP produced in the light-capturing reactions? Select True or False for each statement.
T/F It is used by rubisco to fix CO₂ to RuBP.
T/F It serves the same role as ATP produced by mitochondria.
T/F It is used to regenerate RuBP from G3P molecules.
T/F It is used to produce G3P molecules

Verified step by step guidance

Understand the role of ATP in the light-capturing reactions of photosynthesis. ATP is produced during the light-dependent reactions and is used in the Calvin cycle, which is part of the light-independent reactions.

Consider the role of rubisco in the Calvin cycle. Rubisco is an enzyme that catalyzes the fixation of CO2 to RuBP (ribulose bisphosphate). ATP is not directly used by rubisco for this fixation process.

Compare the role of ATP produced in chloroplasts during photosynthesis with ATP produced in mitochondria during cellular respiration. While both types of ATP provide energy for cellular processes, they are used in different pathways and contexts.

Examine the regeneration of RuBP from G3P (glyceraldehyde-3-phosphate) molecules. ATP is indeed used in the Calvin cycle to regenerate RuBP from G3P, allowing the cycle to continue.

Analyze the production of G3P molecules in the Calvin cycle. ATP is used in the conversion of 3-phosphoglycerate to G3P, which is a crucial step in the cycle.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

ATP in Photosynthesis

ATP, or adenosine triphosphate, is a crucial energy carrier in cells. In photosynthesis, ATP is produced during the light-dependent reactions and is used in the Calvin cycle to drive the synthesis of glucose from carbon dioxide and water. It provides the energy needed for various enzymatic reactions, including the regeneration of RuBP and the conversion of 3-phosphoglycerate to G3P.

Calvin Cycle

The Calvin cycle, also known as the light-independent reactions, occurs in the stroma of chloroplasts. It uses ATP and NADPH produced in the light-dependent reactions to convert CO2 into glucose. Key steps include carbon fixation by rubisco, reduction of 3-phosphoglycerate to G3P, and regeneration of RuBP, which allows the cycle to continue. ATP is essential for the regeneration of RuBP and the production of G3P.

Role of Rubisco

Rubisco is an enzyme that catalyzes the first major step of carbon fixation in the Calvin cycle. It facilitates the attachment of CO2 to RuBP, forming 3-phosphoglycerate. While ATP is not directly used by rubisco, it is crucial for subsequent steps in the cycle, such as the conversion of 3-phosphoglycerate to G3P and the regeneration of RuBP, ensuring the cycle's continuity and efficiency.

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Related Practice

Textbook Question

Which of the following does not occur during the light reactions of photosynthesis?

a. Water is released.

b. Electrons from chlorophyll are moved to a higher-energy state by light.

c. ATP is produced.

d. NADPH is produced to carry electrons to the light-independent reactions.

e. Oxygen is produced when water is split.

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Textbook Question

In mechanism, photophosphorylation is most similar to

a. Substrate-level phosphorylation in glycolysis.

b. Oxidative phosphorylation in cellular respiration.

c. Carbon fixation.

d. Reduction of NADP⁺.

1748

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Textbook Question

Which of the following is a false statement about photosynthesis?

a. During the light-independent reactions, electrons and ATP from the light reactions combine with atmospheric carbon dioxide to produce sugars.

b. The light-independent reactions take place in the chloroplast stroma.

c. Oxygen produced during the light-independent reactions is released into the atmosphere.

d. Chlorophyll absorbs blue and red light and reflects green light.

e. The end product of photosynthesis is a carbohydrate such as glucose.

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Textbook Question

Which process is most directly driven by light energy?

a. Creation of a pH gradient by pumping protons across the thylakoid membrane

b. Reduction of NADP⁺ molecules

c. Transfer of energy from pigment molecule to pigment molecule

d. ATP synthesis

3769

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Textbook Question

Predict how the following conditions would affect the production of O₂, ATP, and NADPH and state whether noncyclic or cyclic electron flow would occur in each:

(3) blue and red photons hit a chloroplast, but a proton channel has been introduced into the thylakoid membrane, so it is fully permeable to protons.

1024

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Textbook Question

Predict how the following conditions would affect the production of O₂, ATP, and NADPH and state whether noncyclic or cyclic electron flow would occur in each:

(2) blue and red photons hit a chloroplast, but no NADP⁺ is available

942

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Textbook Question

Predict how the following conditions would affect the production of O2, ATP, and NADPH and state whether noncyclic or cyclic electron flow would occur in each: (1) Only blue photons hit a chloroplast

1097

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Textbook Question

Predict how the following conditions would affect the production of O₂, ATP, and NADPH and state whether noncyclic or cyclic electron flow would occur in each:

(1) Only blue photons hit a chloroplast

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