Scientific thinking
Learn how biologists test explanations, design experiments, and connect evidence to theories.
Read notes & recall questions ↗Knowledge Mountain
biology notes.
131 small lessons and recall questions. Nineteen chapters. Read a page, check your understanding, or bring the ideas back into the interactive mountain.
These are the same independently written study notes used in our paper-card mountain. Each chapter has its own link, so you can share a useful explanation with a classmate or return to a topic later. No account is required.
Explore the interactive mountain ↗Look up a biology word
Chemistry of life
Review atoms, bonds, water, pH, and the chemical properties that make living systems possible.
Read notes & recall questions ↗Molecules of life
Connect the structure of carbohydrates, lipids, proteins, and nucleic acids to their biological jobs.
Read notes & recall questions ↗Cells and organelles
Explore the nucleus, ribosomes, membranes, endomembrane system, and the structures that organize a cell.
Read notes & recall questions ↗Membranes, enzymes, and energy
Understand membrane transport, osmosis, ATP, enzymes, and how cells couple chemical reactions.
Read notes & recall questions ↗Cellular respiration
Trace carbon and electrons through glycolysis, the citric acid cycle, electron transport, and fermentation.
Read notes & recall questions ↗Photosynthesis
Follow light energy, water, electrons, and carbon through the light reactions and Calvin cycle.
Read notes & recall questions ↗Cell division: mitosis and meiosis
Compare DNA copying, chromosome separation, mitosis, meiosis, and sources of genetic variation.
Read notes & recall questions ↗Inheritance and genetics
Practice alleles, segregation, genetic crosses, inheritance patterns, and probability.
Read notes & recall questions ↗DNA and gene expression
Review DNA replication, transcription, translation, RNA processing, and mutations.
Read notes & recall questions ↗Gene regulation
Understand how cells with similar DNA express different genes and how disrupted controls can affect growth.
Read notes & recall questions ↗Biotechnology
Explore PCR, DNA fragments, plasmids, and the possibilities and limits of genetic tools.
Read notes & recall questions ↗Evolution and populations
Distinguish natural selection, genetic drift, gene flow, and population-genetic models.
Read notes & recall questions ↗The origin of species
Study reproductive barriers, gene flow, and how populations can diverge into species.
Read notes & recall questions ↗Evolutionary history
Read phylogenetic trees and connect common ancestry, evidence, extinction, and diversification.
Read notes & recall questions ↗Microbes and protists
Compare bacteria, archaea, and diverse eukaryotes, including how organisms acquire energy and carbon.
Read notes & recall questions ↗Plants and fungi
Review land-plant adaptations, fungal nutrition, and partnerships between roots and fungi.
Read notes & recall questions ↗Invertebrate diversity
Explore animal body plans, symmetry, arthropod features, and the diversity of animals without backbones.
Read notes & recall questions ↗Vertebrate diversity
Connect chordate features, amniotic development, birds, and branching evolutionary history.
Read notes & recall questions ↗Read. Recall. Explain.
Read a short explanation, look away, and explain the idea in your own words. Try a recall question before revealing its answer. When you get stuck, use the memory cue and try again after a break.
Topics align with Campbell Biology: Concepts & Connections, 10th edition, chapters 1–19. This is an independent study aid, not a copy of the textbook or an official publisher resource. Follow your teacher’s assigned material.