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Questions and Answers
What is the primary function of ATP in cells?
What is the primary function of ATP in cells?
- Regulating cell membrane permeability
- Serving as the main energy currency for cellular work (correct)
- Facilitating the transfer of genetic information
- Aiding in the synthesis of organic molecules
What is the source of energy for most cellular work?
What is the source of energy for most cellular work?
- Heat energy released during respiration
- Chemical energy stored in organic molecules (correct)
- Electrical impulses from the nervous system
- Light energy from the sun
Which process generates O2 and organic molecules used in cellular respiration?
Which process generates O2 and organic molecules used in cellular respiration?
- Photosynthesis (correct)
- Krebs cycle
- Glycolysis
- Fermentation
What role does electron transfer play in catabolic pathways?
What role does electron transfer play in catabolic pathways?
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How do living cells obtain energy to perform work?
How do living cells obtain energy to perform work?
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Study Notes
ATP and Cellular Energy
- ATP (adenosine triphosphate) serves as the primary energy currency of cells, providing the necessary energy for various cellular processes.
- It is crucial for powering muscle contraction, nerve impulse propagation, and biochemical reactions.
Energy Source for Cellular Work
- The primary source of energy for most cellular work is derived from ATP hydrolysis, which releases energy when phosphate bonds are broken.
Photosynthesis and Cellular Respiration
- Photosynthesis is the process that generates O2 and organic molecules, such as glucose, which are pivotal for cellular respiration in plants and other organisms.
- These organic molecules serve as fuel for ATP production during cellular respiration.
Electron Transfer in Catabolic Pathways
- Electron transfer plays a critical role in catabolic pathways by facilitating the breakdown of organic molecules to release energy.
- This process often involves oxidation-reduction reactions, where electrons are transferred between molecules, leading to energy gain.
Energy Acquisition in Living Cells
- Living cells obtain energy to perform work through a combination of metabolic processes, primarily by catabolism of organic compounds.
- Cellular respiration, utilizing oxygen to break down glucose, is a key pathway for ATP generation and efficient energy production.
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