24 topics
Biology help, for a course that's mostly memorisation until it isn't
Biology has a reputation as the memorisation science, and the students who treat it that way usually do fine until the first question that asks them to predict what happens when something breaks. Knowing the steps of transcription is recall; working out what a frameshift does to the protein downstream is not, and that is where the difficulty actually lives.
Where students get stuck
Mitosis and meiosis keep blending together
Anchor on the purpose, not the phases. Mitosis makes two identical diploid cells for growth and repair. Meiosis makes four genetically distinct haploid cells for reproduction. Everything else follows: meiosis needs two divisions because it must halve the chromosome number, and crossing over exists in meiosis specifically because variation is the point. The phase names are the same; the reason they are happening is not.
Dihybrid crosses take forever and I still get them wrong
You do not need the 16-box grid. For independently assorting genes, work each gene separately as a simple 3:1 or 1:1 and multiply the probabilities. The 9:3:3:1 ratio is just 3/4 × 3/4, 3/4 × 1/4, and so on. This is faster, less error-prone, and it is the only workable approach once a third gene appears.
Transcription and translation — which enzyme, which direction
Transcription happens in the nucleus, RNA polymerase reads the template strand and builds mRNA that matches the coding strand with U for T. Translation happens at the ribosome, reading mRNA in codons of three from the start codon. The detail worth holding onto is that a frameshift mutation is far more damaging than a point mutation, because everything after it is read in the wrong groups — that reasoning is what exam questions test.
Why does water move that way? Osmosis questions confuse me
Water moves toward the higher solute concentration — it follows solute, not the other way around. Hypertonic surroundings mean more solute outside, so water leaves and the cell shrinks. The naming is the trap, because 'hypertonic solution' describes the solution, not the cell, and half of all wrong answers here are the right reasoning applied to the wrong side of the membrane.
What's covered
Biology topics you can work through with a tutor, generate practice on, or turn into flashcards and a study plan.
Cells and biochemistry
- Macromolecules: carbohydrates, lipids, proteins, nucleic acids
- Enzymes, activation energy, and inhibition
- Cell organelles and their functions
- Membrane structure and transport
- Osmosis, diffusion, and tonicity
- Cellular respiration and photosynthesis
Genetics and molecular biology
- The cell cycle, mitosis, and meiosis
- DNA replication
- Transcription, translation, and the genetic code
- Mutations and their consequences
- Mendelian inheritance and Punnett squares
- Non-Mendelian patterns and sex linkage
- Pedigrees, gene regulation, and biotechnology
Evolution and diversity
- Natural selection and evidence for evolution
- Speciation and isolating mechanisms
- Population genetics and Hardy–Weinberg
- Phylogeny and classification
Physiology and ecology
- Circulatory and respiratory systems
- Digestive and excretory systems
- The nervous and endocrine systems
- Homeostasis and feedback loops
- Immune response
- Population ecology and energy flow
- Nutrient cycles and ecosystem dynamics
Biology questions
Can it make flashcards for the memorisation-heavy units?
Yes, and it generates the reasoning behind each card rather than a bare term and definition — which matters in biology, where the exam questions ask you to apply the term rather than restate it. The decks are saved so you can come back to them before the exam.
Can it explain a diagram from my textbook?
Yes. Hold the page up to the camera or share your screen, and it will walk through the diagram — which is usually faster than trying to describe a nephron or a phylogenetic tree in words.
Does it cover AP Biology and first-year university bio?
Yes. The topics above cover both; the difference is depth and how much of the reasoning you are expected to produce yourself, and it will pitch to whichever course you say you are in.
Stuck on biology right now?
Talk it through out loud, share your screen, and watch it worked out step by step on a whiteboard.
Start free — no card