Biochemistry explains how the properties of molecules make life possible. Start with biological molecules, connect their structures to their roles, then use enzymes and energy transfer to understand metabolism.

A route from molecules to metabolism

  1. Foundations: water, carbon chemistry, chemical bonds and the difference between a monomer and a polymer.
  2. Biological molecules: carbohydrates, lipids, proteins and nucleic acids. Compare structure and function rather than memorizing a list.
  3. Enzymes: active sites, activation energy, rate measurements and the effect of changing conditions.
  4. Metabolism: connect coupled reactions, ATP and electron carriers before studying a complete pathway.

This is a learning sequence, not a claim that every step already has a complete PreachBio lesson.

Start with an available worked lesson

Enzyme inhibition

Compare competitive inhibition with the pure noncompetitive model. Interpret changes in Km and Vmax, then use the lesson’s explained questions and quiz.

Study enzyme inhibition

Chromatography and Rf

Connect molecular properties to pigment separation. Work through a calculation and consider the limits of an Rf comparison.

Work through chromatography

Go deeper into plant metabolism

After the molecular foundations, follow the Plant Biochemistry collection. The oxidative pentose phosphate pathway lesson is an advanced extension about NADPH and carbon metabolism, not a substitute for learning basic enzyme action.

Connect this subject

Check your starting knowledge

Can you explain why the structure of a protein matters to its function, and distinguish a reaction’s energy change from the activation energy needed to begin it? Revisit these ideas before comparing enzyme-rate graphs.

Coverage and sources

Available resources currently emphasize enzyme inhibition, practical calculations and advanced plant pathways. This hub is not a complete GCSE, IGCSE, A-Level, AP or university course. Use the current specification for your qualification.

For an introductory reference, see OpenStax Biology 2e: Biological Macromolecules. PreachBio lessons and questions are independently prepared; no institutional endorsement is implied. Read our editorial standards and fact-checking policy.