Life on Earth: At a Glance

Life on Earth
Audesirk & Audesirk
Prentice-Hall, Inc.

Energy and the Ability to Do Work: The laws of thermodynamics describe the basic properties of energy.
Living things use the energy of sunlight to create the low-entropy conditions characteristic of life.

Energy Flow in Chemical Reactions
Exergonic reactions release energy.
Endergonic reactions require an input of energy.
Coupled reactions link exergonic with endergonic reactions.
Chemical reactions are reversible.

Controlling the Metabolism of Living Cells
At body temperatures, high activation energy makes spontaneous reactions proceed too slowly to sustain life.
Catalysts reduce activation energy.
Enzymes are biological catalysts.

Coupled Reactions and Energy-Carrier Molecules
ATP is the principal energy carrier in a cell.; Living things use the energy of sunlight to create the low-entropy conditions characteristic of life.

Energy Flow in Chemical Reactions
Exergonic reactions release energy.
Endergonic reactions require an input of energy.
Coupled reactions link exergonic with endergonic reactions.
Chemical reactions are reversible.

Controlling the Metabolism of Living Cells
At body temperatures, high activation energy makes spontaneous reactions proceed too slowly to sustain life.
Catalysts reduce activation energy.
Enzymes are biological catalysts.

Coupled Reactions and Energy-Carrier Molecules
ATP is the principal energy carrier in a cell.
Energy Flow in Chemical Reactions: Exergonic reactions release energy.
Endergonic reactions require an input of energy.
Coupled reactions link exergonic with endergonic reactions.
Chemical reactions are reversible.

Controlling the Metabolism of Living Cells
At body temperatures, high activation energy makes spontaneous reactions proceed too slowly to sustain life.
Catalysts reduce activation energy.
Enzymes are biological catalysts.

Coupled Reactions and Energy-Carrier Molecules
ATP is the principal energy carrier in a cell.; Endergonic reactions require an input of energy.
Coupled reactions link exergonic with endergonic reactions.
Chemical reactions are reversible.

Controlling the Metabolism of Living Cells
At body temperatures, high activation energy makes spontaneous reactions proceed too slowly to sustain life.
Catalysts reduce activation energy.
Enzymes are biological catalysts.

Coupled Reactions and Energy-Carrier Molecules
ATP is the principal energy carrier in a cell.; Coupled reactions link exergonic with endergonic reactions.
Chemical reactions are reversible.

Controlling the Metabolism of Living Cells
At body temperatures, high activation energy makes spontaneous reactions proceed too slowly to sustain life.
Catalysts reduce activation energy.
Enzymes are biological catalysts.

Coupled Reactions and Energy-Carrier Molecules
ATP is the principal energy carrier in a cell.; Chemical reactions are reversible.

Controlling the Metabolism of Living Cells
At body temperatures, high activation energy makes spontaneous reactions proceed too slowly to sustain life.
Catalysts reduce activation energy.
Enzymes are biological catalysts.

Coupled Reactions and Energy-Carrier Molecules
ATP is the principal energy carrier in a cell.
Controlling the Metabolism of Living Cells: At body temperatures, high activation energy makes spontaneous reactions proceed too slowly to sustain life.
Catalysts reduce activation energy.
Enzymes are biological catalysts.

Coupled Reactions and Energy-Carrier Molecules
ATP is the principal energy carrier in a cell.; Catalysts reduce activation energy.
Enzymes are biological catalysts.

Coupled Reactions and Energy-Carrier Molecules
ATP is the principal energy carrier in a cell.; Enzymes are biological catalysts.

Coupled Reactions and Energy-Carrier Molecules
ATP is the principal energy carrier in a cell.
Coupled Reactions and Energy-Carrier Molecules: ATP is the principal energy carrier in a cell.

Designed in cooperation with Andrew Stull and Steven Brunasso.

Last Update - July 25, 1997