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Questions and Answers
If a plant cell is placed in a dark environment, which process would be immediately affected?
If a plant cell is placed in a dark environment, which process would be immediately affected?
- ATP synthesis, because the electron transport chain requires light energy.
- Sugar breakdown, because the plant will need to conserve energy.
- Cellular respiration, because the plant cannot produce ATP.
- Photosynthesis, because sunlight is required to convert carbon dioxide and water into sugar and oxygen. (correct)
Which of the following statements accurately compares photosynthesis and cellular respiration?
Which of the following statements accurately compares photosynthesis and cellular respiration?
- Photosynthesis and cellular respiration both occur in the mitochondria of plant and animal cells.
- Photosynthesis uses carbon dioxide and water to produce sugar and oxygen, while cellular respiration uses sugar and oxygen to produce carbon dioxide and water. (correct)
- Photosynthesis is an exergonic reaction that produces ATP, while cellular respiration is an endergonic reaction that consumes ATP.
- Photosynthesis occurs in all living organisms, while cellular respiration only occurs in animals.
Why is ATP crucial for living cells?
Why is ATP crucial for living cells?
- It helps in the transport of oxygen within the cell.
- It serves as the primary molecule for storing genetic information.
- It defends the cell against harmful pathogens.
- It’s the direct energy source for cellular work, formed by the breakdown of sugar. (correct)
How does the energy transformation in photosynthesis support the process of cellular respiration in other organisms?
How does the energy transformation in photosynthesis support the process of cellular respiration in other organisms?
If a scientist discovers a new organism that can perform cellular respiration but not photosynthesis, what can be inferred about its energy source?
If a scientist discovers a new organism that can perform cellular respiration but not photosynthesis, what can be inferred about its energy source?
Flashcards
What is energy?
What is energy?
The capacity to perform work, where work occurs when force moves an object.
What is Photosynthesis?
What is Photosynthesis?
The process where plants convert carbon dioxide and water into sugar and oxygen using sunlight.
What is an Endergonic Reaction?
What is an Endergonic Reaction?
A reaction that requires energy input to occur. (e.g. photosynthesis)
What is Cellular Respiration?
What is Cellular Respiration?
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What is ATP?
What is ATP?
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Study Notes
- All living things need energy for survival and reproduction, including bacteria, plants, and animals.
- Energy empowers work, facilitating force to move any object.
- Solar energy is captured by plants to produce sugar, which organisms then use as an energy source to perform work.
How Plants Transform Energy from the Sun
- Plants convert carbon dioxide and water into sugar and oxygen using sunlight/solar energy through a process known as photosynthesis.
- Photosynthesis is an endergonic reaction and requires energy in order to combine carbon dioxide and water into sugar.
- The energy from the sun helps to drive photosynthesis.
- Some energy used during photosynthesis is stored in the sugar molecule.
How Organisms Use Energy from Sugar
- Organisms break down sugar to release stored energy.
- The energy released from sugar breakdown allows cells to make adenosine triphosphate (ATP).
- ATP synthesis by cells is called cellular respiration.
- Cellular respiration is an exergonic reaction, meaning energy is released when the sugar breaks down into carbon dioxide and water.
- Sugar and oxygen are reactants, and carbon dioxide and water are the products of cellular respiration.
- Cellular respiration is the reverse of photosynthesis, with the products of one process serving as the reactants for the other.
- Photosynthesis and cellular respiration are related as the products of one become the reactants for the other.
ATP
- Cells require ATP because they can't directly use sugar to perform work.
- Sugar must be converted into a more usable form, which is ATP.
- Muscle cells use ATP to contract.
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Description
Living things need energy which they obtain through photosynthesis or by breaking down sugars. Plants use solar energy to convert carbon dioxide and water into sugar and oxygen through photosynthesis. Organisms break down sugar to release stored energy and synthesize adenosine triphosphate (ATP).
