Why this chapter matters
Life depends on capturing, converting, and using energy to power growth, maintenance, and response.
What you will learn
- Describe how enzymes lower activation energy and how environmental factors affect enzyme activity.
- Connect light reactions and the Calvin cycle to the conversion of light energy into chemical energy.
- Compare glycolysis, Krebs cycle, and oxidative phosphorylation in terms of inputs, outputs, and ATP yield patterns.
Lessons in this chapter
- Enzymes and metabolic pathwaysUse enzyme and substrate interactions to explain reaction rates and pathway regulation.
- Photosynthesis mechanismsMap carbon and electron flow through major photosynthetic stages.
- Cellular respiration stagesTrack matter and energy through aerobic respiration and ATP generation.
- Energy coupling with ATPExplain how ATP hydrolysis drives endergonic cellular work.
Study task
Create a side-by-side flowchart of photosynthesis and respiration that labels where energy is stored, transferred, and released.
Chapter checkpoint
What is the main role of ATP in cells?
ATP serves as an immediate energy carrier that couples energy-releasing reactions to energy-requiring cellular processes.