MCAT Biology

A comprehensive introduction to key biological concepts tested on the MCAT, focusing on cellular processes, genetics, and the integration of biological systems.

Cell Structure and FunctionGenetics and InheritanceBiological Molecules
Cellular Respiration and MetabolismMolecular Genetics and Gene ExpressionHuman Body Systems Integration
Genetic Testing and Personalized MedicineBiotechnology in Everyday LifeDisease Prevention and Vaccination
Active Recall and Spaced RepetitionCritical Reading and Data InterpretationTime Management and Pacing
Cell Structure and F...Genetics and Inherit...Biological MoleculesCellular Respiration...Molecular Genetics a...Human Body Systems I...Genetic Testing and ...Biotechnology in Eve...Disease Prevention a...Active Recall and Sp...Critical Reading and...Time Management and ...
Basic Concepts

Biological Molecules

The Chemicals of Life

All living things are made up of four main types of biological molecules: carbohydrates, proteins, lipids, and nucleic acids.

Carbohydrates

Sugars and starches that provide energy and structural support.

Proteins

Made of amino acids, proteins perform most cellular functions, from enzymes to structural components.

Lipids

Fats and oils that store energy and make up cell membranes.

Nucleic Acids

DNA and RNA store and transmit genetic information.

Everyday Importance

A healthy diet requires a balance of these molecules. Disorders like diabetes and high cholesterol stem from imbalances in these biological molecules.

Examples

  • Enzymes are proteins that speed up chemical reactions in the body.

  • DNA stores genetic information in the nucleus of cells.

In a Nutshell

Biological molecules are essential chemicals that make up and run living cells.

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Cellular Respiration and Metabolism