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Energy and molecules: photosynthesis and respiration

Key ideas • Key ideas

Key concepts

What you'll likely be quizzed about

  • Photosynthesis transforms carbon dioxide and water into glucose and oxygen using light energy absorbed by chlorophyll in chloroplasts.
  • The reaction can be summarized by the equation 6CO2 + 6H2O → C6H12O6 + 6O2, and is endothermic since it stores light energy in chemical bonds.
  • Photosynthetic organisms form the primary energy source for food chains and play a crucial role in maintaining atmospheric oxygen and carbon dioxide levels.

Flashcards

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Which organelle contains chlorophyll and carries out photosynthesis?

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Chloroplasts carry out photosynthesis in plant cells.

Key notes

Important points to keep in mind

Photosynthesis stores light energy in chemical bonds of glucose; respiration releases that energy for cellular use.

Chloroplast structure and pigments absorb specific light wavelengths for photosynthesis.

Limiting factors determine the maximum rate of photosynthesis: light, CO2, temperature, chlorophyll.

Aerobic respiration yields more energy per glucose than anaerobic pathways.

Fats and proteins serve as alternative fuels after enzymatic modification; fats provide high energy yield.

Protein shape governs function; minor changes in amino acid sequence can alter enzyme activity.

Xylem and phloem structures align with their transport functions: xylem for water flow, phloem for sugar transport.

Photosynthetic organisms form the foundation of food webs and stabilize atmospheric gases, supporting ecosystems.

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