Introduction to Cellular Energetics

air

Where does a dried plant get its mass from?

Solar Energy + 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Photosynthesis Reaction

intermediates, enzymes

In the photosynthesis reaction, what is missing?

flows

What does energy do?

cycles

What does matter do?

Endergonic

Absorption of energy; products have more free energy than reactants

• anabolic

Exergonic

Release of energy; products have less free energy than reactants

• catabolic

First Law of Thermodynamics

Matter and energy may be reorganized but not created nor destroyed; it is conserved

Second Law of Thermodynamics

Every energy transfer or transformation increases the entropy of the universe

Entropy

Measure of disorder or randomness

Synthesis, reproduction, movement, active transport, temperature regulation

What do we need energy for?

Catabolic Reaction

Break down molecule; release free energy

Anabolic Reaction

Build molecule; absorb free energy

Energy storage, growth

What happens with excess free energy?

loss of mass, death

What happens when insufficient free energy is acquired

Coupled Reactions

Cellular processes that release energy may be coupled with processes that require energy