AP Biology: The Six High-Yield Topics That Score Most
May 9, 2026 · 5 min · AP biology · AP biology prep · biology exam
AP Biology covers almost everything in a college intro bio course. Six topics dominate the exam. Drill these and you cover most of what gets tested.
1. Cellular processes (energy and communication)
- Photosynthesis (light-dependent, light-independent)
- Cellular respiration (glycolysis, Krebs, electron transport)
- Cell signalling
This is your top priority. Both pathways come up almost every year.
2. Genetics
- Mendelian genetics, Punnett squares
- Pedigrees
- Mutations
- Gene regulation
3. Evolution
- Natural selection
- Speciation
- Hardy-Weinberg
- Phylogenetics
4. Molecular biology
- DNA structure and replication
- Transcription and translation
- Protein structure
5. Ecology
- Population growth
- Food webs and energy flow
- Biogeochemical cycles
6. Biochemistry
- Macromolecules (carbs, lipids, proteins, nucleic acids)
- Enzymes
What the exam looks like
- Multiple choice (60% of score)
- Free response — six questions, mix of long and short
- Lots of data analysis questions (graphs, tables)
Three-week plan
- Week 1: cellular processes + molecular biology
- Week 2: genetics + evolution
- Week 3: ecology + biochemistry + full mock exam
What examiners reward
- Specificity (don't say "the cell does X" — say "the chloroplast does X")
- Connecting ideas (this is why evolution and genetics show up together)
- Quantitative reasoning (graphs, calculations)
- Following experimental design (controls, variables)
Common pitfalls
- Memorising without understanding (the questions are application-heavy)
- Confusing photosynthesis with cellular respiration (they're opposite directions)
- Skipping Hardy-Weinberg (the math comes up)
- Not practicing data analysis