25 multiple-choice questions in College Board exam style. Each has four choices and a full explanation of why each option is right or wrong.
Read the question carefully before looking at the choices. Many AP Bio questions have answers that look almost identical; small wording differences matter.
Eliminate before guessing. AP Bio distractors often include true statements that don't answer the actual question. Cross out anything irrelevant first.
If structure is in the question, function is in the answer (and vice versa). The structure–function relationship comes up constantly in Unit 2 — especially with membranes and organelles.
Read the explanations even when you got it right. Each one teaches a small fact that often returns in a different form on the exam.