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Chapter 8: Problem 22

What are the roles of ATP and NADPH in photosynthesis? a. ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that produce sugars. b. ATP and NADPH are forms of chemical energy produced from the light independent reactions, to be used in the light dependent reactions that produce sugars. c. ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that produce proteins. d. ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that use sugars as reactants.

Short Answer

Expert verified
The roles of ATP and NADPH in photosynthesis are to provide energy and reducing power for the Calvin cycle.

Step by step solution

01

Understand the Components of Photosynthesis

Photosynthesis consists of two major stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). The light-dependent reactions occur in the thylakoid membranes and capture energy from sunlight to produce ATP and NADPH. The light-independent reactions, which take place in the stroma, utilize ATP and NADPH to synthesize glucose (sugars) from carbon dioxide.
02

Identify the Roles of ATP and NADPH

ATP and NADPH are forms of chemical energy. During photosynthesis, they are produced in the light-dependent reactions and used in the light-independent reactions. Specifically, these molecules provide the energy and reducing power needed for the synthesis of sugars in the Calvin cycle.
03

Verify the Correct Option

With the roles of ATP and NADPH identified, it's clear they are produced during the light-dependent reactions and used in the light-independent reactions to produce sugars. Therefore, the correct option is a. 'ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that produce sugars.'

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

light-dependent reactions
Photosynthesis begins with the light-dependent reactions. These reactions occur in the thylakoid membranes of the chloroplasts.
Here, the energy from sunlight is captured by chlorophyll and other pigments. This process generates energy-rich molecules, ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).
The light-dependent reactions involve several key steps:
  • Light Absorption: Chlorophyll absorbs sunlight, which excites electrons.
  • Water Splitting: Water molecules are split, releasing oxygen and providing electrons.
  • Electron Transport Chain: Excited electrons move through a chain of proteins, creating a flow of energy that produces ATP and NADPH.
These molecules (ATP and NADPH) are essential for the next phase of photosynthesis.
Calvin cycle
The Calvin cycle, also known as the light-independent reactions, takes place in the stroma of the chloroplasts.
Unlike the light-dependent reactions, this cycle doesn't require sunlight.
Instead, it depends on the ATP and NADPH produced earlier to convert carbon dioxide into glucose (a sugar).
The Calvin cycle includes:
  • Carbon Fixation: CO鈧� is attached to a 5-carbon sugar called ribulose bisphosphate (RuBP).
  • Reduction Phase: ATP and NADPH help convert the fixed carbon into G3P (glyceraldehyde-3-phosphate), a three-carbon sugar.
  • Regeneration of RuBP: Some G3P molecules help regenerate RuBP, allowing the cycle to continue.
The glucose produced serves as an energy source for the plant and forms the basis of the food chain.
photosynthesis energy transformation
Photosynthesis is a process of energy transformation. It converts light energy from the sun into chemical energy stored in glucose. This process is vital for life on Earth.
Here鈥檚 how the transformation occurs:
  • Energy Capture: Sunlight is captured in the light-dependent reactions, producing ATP and NADPH.
  • Energy Conversion: ATP and NADPH power the Calvin cycle, converting CO鈧� into glucose.
  • Energy Storage: Glucose acts as an energy reserve that can be used by the plant and other organisms.
The efficiency of this energy transformation supports plant growth and sustains ecosystems. Understanding these processes helps us appreciate how energy flows through living systems.

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Most popular questions from this chapter

How is the energy from the sun transported within chloroplasts? a. When photons strike photosystem (PS) II, pigments pass the light energy to chlorophyll a molecules that excite an electron, which is then passed to the electron transport chain. The cytochrome complex transfers protons across the thylakoid membrane and transfers electrons from PS-II to PS-I. The products of the light dependent reaction are used to power the Calvin cycle to produce glucose. b. When photons strike photosystem (PS) I, pigments pass the light energy to chlorophyll, molecules that excite electrons, which is then passed to the electron transport chain. The cytochrome complex then transfers protons across the thylakoid membrane and transfers electrons from PS-II to PS-I. The products of the light dependent reaction are used to power the Calvin cycle to produce glucose. c. When photons strike photosystem (PS) II, pigments pass the light energy to chlorophyll molecules that in turn excite electrons, which are then passed to the electron transport chain. The cytochrome complex transfers protons across the thylakoid membrane and transfers electrons from PS-I to PS-II. The products of the light dependent reaction are used to power the Calvin cycle to produce glucose. d. When photons strike photosystem (PS) II, pigments pass the light energy to chlorophyll molecules that excite electrons, which is then passed to the electron transport chain. The cytochrome complex transfers protons across the thylakoid membrane and transfers electrons from PS II to PS I. The products of the light independent reaction are used to power the Calvin cycle to produce glucose.

Carbon, in the form of \(\mathrm{CO}_{2},\) must be taken from the atmosphere and attached to an existing organic molecule in the Calvin cycle. Therefore, the carbon is bound to the molecule. The products of the cycle only occur because of the added carbon. What are the products of the Calvin cycle and what is regenerated? a. The product of the Calvin cycle is glyceraldehyde-3 phosphate and RuBP is regenerated. b. The product of the Calvin cycle is glyceraldehyde-3 phosphate and RuBisCO is regenerated. c. The product of the Calvin cycle is a 3-PGA molecule and glyceraldehyde-3 phosphate is regenerated. d. The product of the Calvin cycle is glyceraldehyde-3 phosphate and oxygen is regenerated.

3\. In which compartment of the plant cell do the light-independent reactions of photosynthesis take place? a. mesophyll b. outer membrane c. stroma d. thylakoid

What will happen to a plant leaf that loses \(\mathrm{CO}_{2}\) too quickly? a. no effect on the rate of photosynthesis b. Photosynthesis will slow down or stop possibly. c. Photosynthesis will increase exponentially. d. Photosynthesis will decrease and then increase.

Which portion of the electromagnetic radiation originating from the sun is harmful to living tissues? a. blue b. green c. infrared d. ultraviolet
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