Exam prep · Free college course
A complete first-semester college biology course for science majors, built from OpenStax Biology 2e chapters 1 through 17, the C-ID BIOL 135S transfer descriptor and AP Biology units 1 to 6. It starts with how biologists test ideas and the chemistry life runs on, then builds the cell piece by piece: macromolecules, cell structure, membranes and transport, and the enzymes and energy rules behind metabolism. Cellular respiration and photosynthesis come next, then cell signaling, the cell cycle and meiosis. The last third is genetics: Mendel and probability, linkage and pedigrees, DNA replication, gene expression and its regulation, and biotechnology. Punnett squares, probability, map distances, chi-square, pH and magnification problems are worked calculations, each recomputed by script before publishing.
Copied straight from the course. In the app, each wrong option also gets its own explanation.
Card 1While the ETC is running, how does the intermembrane space compare with the matrix?
Lower pH than the matrix. H+ is pumped out of the matrix into the intermembrane space, so that space has more H+ and a lower pH.
Card 2A round-seeded plant of unknown genotype is crossed with rr, and about half the offspring are wrinkled. What was the unknown genotype?
Rr, heterozygous. Only a heterozygous Rr parent gives a 1:1 round:wrinkled ratio in a test cross.
Card 3Why is the trp operon called a repressible operon?
It is on by default and shuts off when tryptophan is plentiful. E. coli always needs some tryptophan, so the trp operon is normally on; excess tryptophan activates the repressor and turns it off.
Yes. Create a free Encodr account and all 16 units and 1,390 cards are yours to study, with spaced repetition scheduling your reviews.
OpenStax Biology 2e chapters 1 through 17: the chemistry of life, macromolecules, cell structure, membranes, metabolism and enzymes, cellular respiration, photosynthesis, cell communication, the cell cycle, meiosis, Mendelian and chromosomal genetics, DNA replication, gene expression and regulation, and biotechnology.
It lines up with AP Biology units 1 to 6, which are designed to match a first college semester. The cards were checked against the AP Biology Course and Exam Description, so AP students can use it too.
The genetics units carry most of it: Punnett squares, the product and sum rules, test crosses, map distances from recombination frequency and chi-square (for courses that use it). pH, magnification and PCR copy-number problems appear too. Every numeric card states its rounding rule and was independently recomputed before publishing.
General Biology II covers evolution, diversity, physiology and ecology. The two semesters do not depend on each other, so you can take them in either order.