Bioenergetics and Thermodynamics in Biology

Revision sheet excerpt

Bioenergetics Revision Sheet

1. 📌 Essentials

  • Life relies on extraction, transformation, and dissipation within cells- Systems: open (exchange matter/energy), closed (energy only), isolated (no exchange).
  • First law: energy conserved; ΔU = Q + W.
  • Enthalpy (H): heat exchange at constant pressure; ΔH > 0 endothermic, ΔH < 0 exothermic.
  • Spontaneous reactions: ΔG < 0; depend on ΔH and ΔS.
  • Entropy (S): measure of disorder; increases in spontaneous processes.
  • Gibbs free energy (G): ΔG = ΔH - T ΔS; determines reaction spontaneity.
  • Equilibrium: ΔG = 0; ΔG° relates to equilibrium constant K.
  • Redox reactions: electron transfer; characterized by reduction potentials (E°).
  • Energy forms: caloric, electrical, chemical, nuclear, mechanical.
  • Biological systems are open thermodynamic systems constantly exchanging energy and matter.

2. 🧩 Key Structures & Components

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Quiz preview

1. According to the second law of thermodynamics, what is the trend of entropy in the universe?

2. What does the change in Gibbs free energy (ΔG) indicate about a biochemical reaction?

3. What is the primary focus of bioenergetics within cellular metabolism?

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Flashcards preview

System types — examples?

Open, closed, isolated systems

Life's energy processes?

Extraction, transformation, dissipation.

ΔG — sign for spontaneous?

Negative ΔG indicates spontaneity

Open vs closed systems?

Open: matter and energy exchange.

Bioenergetics — focus?

Energy exchange, transformation, thermodynamics in biology

First law of thermodynamics?

Energy conserved; ΔU = Q + W.

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What does the revision sheet on Bioenergetics and Thermodynamics in Biology cover?

The revision sheet covers the essential concepts of Bioenergetics and Thermodynamics in Biology. It is organized by topic to facilitate learning and memorization, with key definitions, explanations and summaries.

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How many questions are in the Bioenergetics and Thermodynamics in Biology quiz?

The quiz contains 9 multiple-choice questions with detailed corrections and explanations for each answer. Ideal for testing your knowledge and identifying gaps.

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