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Questions and Answers
What is the energy currency of the cell?
What is the energy currency of the cell?
Adenosine triphosphate (ATP)
What are the three main components of ATP?
What are the three main components of ATP?
ATP is composed of three phosphate groups, a ribose sugar, and a guanine base.
ATP is composed of three phosphate groups, a ribose sugar, and a guanine base.
False (B)
What is the process of breaking down bonds between phosphate groups in ATP called?
What is the process of breaking down bonds between phosphate groups in ATP called?
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The hydrolysis of ATP releases ______, which is a form of energy released as heat in the surrounding water.
The hydrolysis of ATP releases ______, which is a form of energy released as heat in the surrounding water.
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What are the three main types of cellular work that ATP facilitates?
What are the three main types of cellular work that ATP facilitates?
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Catabolism is an endergonic process that consumes energy.
Catabolism is an endergonic process that consumes energy.
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What is the main role of chlorophyll in photosynthesis?
What is the main role of chlorophyll in photosynthesis?
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What are the accessory pigments in photosynthesis and what is their role?
What are the accessory pigments in photosynthesis and what is their role?
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Photosystem II absorbs light with a wavelength of 700nm.
Photosystem II absorbs light with a wavelength of 700nm.
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Flashcards
ATP
ATP
Adenosine triphosphate, a molecule that stores and releases energy for cellular processes.
ADP
ADP
Adenosine diphosphate, a molecule formed when ATP loses a phosphate group, releasing energy.
Hydrolysis of ATP
Hydrolysis of ATP
The process of breaking down ATP into ADP and releasing energy.
Cellular Work
Cellular Work
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Chemical Work
Chemical Work
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Transport Work
Transport Work
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Mechanical Work
Mechanical Work
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Energy Coupling
Energy Coupling
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Exergonic Reaction
Exergonic Reaction
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Endergonic Reaction
Endergonic Reaction
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ATP Regeneration
ATP Regeneration
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Phosphorylation
Phosphorylation
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Dephosphorylation
Dephosphorylation
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Pigment
Pigment
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Chlorophyll
Chlorophyll
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Photosynthesis
Photosynthesis
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Chromatography
Chromatography
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Photosystem
Photosystem
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Light-harvesting complex
Light-harvesting complex
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Reaction-center complex
Reaction-center complex
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Photosystem II
Photosystem II
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Photosystem I
Photosystem I
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Study Notes
ATP-ADP Cycle
- Adenosine triphosphate (ATP) is the cell's energy currency, powering various cellular functions (mechanical work, transport, chemical reactions).
- ATP consists of a ribose sugar, adenine, and three phosphate groups.
- The last two phosphate bonds in ATP store high-energy bonds.
- Hydrolysis of these bonds releases energy, breaking ATP into adenosine diphosphate (ADP) and inorganic phosphate (Pi).
- The cell recycles ATP by phosphorylating ADP, using energy from catabolic processes.
- ATP powers three main types of cellular work: chemical, transport, and mechanical work.
Hydrolysis of ATP
- ATP hydrolysis breaks the phosphate bonds, releasing energy.
- This energy is derived from the negative charge repulsion of phosphate groups, not from the bonds themselves.
- Hydrolysis of ATP leads to a change in protein shape and ability to bind other molecules.
- This shape change powers various cellular processes.
Regeneration of ATP
- Catabolic (exergonic) reactions provide energy required for ATP regeneration from ADP and inorganic phosphate.
- ATP regeneration is rapid; humans would need nearly their body weight in ATP daily without regeneration.
Photosynthesis
- Pigments capture solar energy for photosynthesis.
- Chlorophyll is the primary photosynthetic pigment in plants.
- Chlorophyll absorbs blue and red light and reflects green light, resulting in plants appearing green.
- Chlorophyll is found in thylakoid membranes inside chloroplasts.
- Multiple chlorophyll types (e.g., chlorophyll a, chlorophyll b) capture more wavelengths of sunlight.
Photoexcitation of Chlorophyll
- Chlorophyll molecules absorb photons of light.
- This excites an electron to a higher energy level.
- The excited electron returns to its original energy level, releasing energy as heat or light.
- This process is crucial for transferring energy in photosynthesis.
Photosystems
- Photosystems are protein complexes in thylakoid membranes that contain pigments and proteins.
- They capture light energy and convert it to chemical energy.
- Photosystem II and Photosystem I are the two main types of photosystems.
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Description
Explore the ATP-ADP cycle, the cell's energy currency. This quiz covers ATP structure, hydrolysis, and the regeneration process, highlighting its critical role in powering cellular functions. Understand how ATP drives different types of cellular work and the energy dynamics involved.