Your cells have boundaries. Consider learning them.
Use this overview to connect processes. Review the details below for mechanisms and exceptions.
Common trap: Prokaryotes are not empty bags without organization. They have membranes, ribosomes, DNA, and regulated biochemical processes, even though they lack the classic eukaryotic membrane-bound organelles.
Common trap: Do not confuse larger total surface area with larger SA:V. Always divide area by volume and keep the units sensible.
Common trap: A membrane protein is not automatically a pump. Channels can support passive movement without directly using ATP.
Common trap: Equilibrium does not mean molecules stop moving. Also, the presence of a protein does not mean transport is active.
Common trap: More negative is lower, not higher. Do not decide water direction from solute concentration alone when pressure differences are supplied.
Common trap: Facilitated diffusion and active transport both use proteins. Distinguish them by direction relative to the relevant gradient and by their energy coupling.
Common trap: Ribosomes, not the Golgi, join amino acids into the primary polypeptide sequence. Plants also have mitochondria; chloroplasts do not replace respiration.
Common trap: The nucleus is not explained by the classic mitochondrial/chloroplast endosymbiosis evidence. Also, an organelle having some DNA does not mean it can survive independently.
Original review notes informed by standard biology principles. Check the official AP Biology framework ↗ and OpenStax Biology 2e ↗ for further reading.