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AP Biology Unit 1 — Chemistry of Life

One-page sprint review

Nine pages on the macromolecules, hydrogen bonding, and dehydration vs hydrolysis questions that come up every year. Print or scroll on screen — no signup required.

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Exam Weight
8–11%
MCQs
5–7
FRQ Appearance
Very Frequent
Sprint Time
~90 min

Quick Glance — all topics in this unit

Priority, exam format, and the trap that most often costs the point. Transcribed from page 1 so this content is searchable.

TopicPriorityFormatKey trap / must-know
1.1 Water & H-Bonding★★★MCQ, FRQCohesion ≠ Adhesion; ice has more H-bonds than liquid water.
1.2 Elements of Life★★MCQCarbon has 4 bonds, not 2; phosphorus ≠ phosphate.
1.3 Dehydration & Hydrolysis★★★MCQ, FRQDehydration RELEASES water (builds); Hydrolysis CONSUMES water (breaks).
1.4 Carbohydrates★★★MCQ, DataStarch vs cellulose = α-glucose vs β-glucose, NOT different monomers.
1.5 Lipids★★★MCQ, FRQLipids are NOT polymers; steroids cross membranes freely.
1.6 Nucleic Acids★★★MCQ, Calc, FRQChargaff (%A=%T, %G=%C) applies to dsDNA only — NOT RNA, NOT ssDNA.
1.7 Proteins★★★MCQ, FRQ, DataDenaturation does NOT break peptide bonds — primary structure stays intact.

Topic-by-topic visual review

Nine pages, one topic each. Open the PDF for print quality, or scroll to study on screen.

Cover: Unit 1 overview — exam weight, sprint time, and topic priorities.
Cover  ·  Unit 1 overview — exam weight, sprint time, and topic priorities.
1.1 Water & Hydrogen Bonding: Why water is special: polarity, H-bonds, cohesion vs adhesion, thermal properties, density, the universal solvent.
1.1 Water & Hydrogen Bonding  ·  Why water is special: polarity, H-bonds, cohesion vs adhesion, thermal properties, density, the universal solvent.
1.2 + 1.3 Elements of Life · Dehydration & Hydrolysis: CHONPS, why carbon is life's backbone, and dehydration synthesis vs hydrolysis.
1.2 + 1.3 Elements of Life · Dehydration & Hydrolysis  ·  CHONPS, why carbon is life's backbone, and dehydration synthesis vs hydrolysis.
1.4 Carbohydrates: α vs β glucose, the highest-yield distinction. Polysaccharides, simple sugars, why we can't digest cellulose.
1.4 Carbohydrates  ·  α vs β glucose, the highest-yield distinction. Polysaccharides, simple sugars, why we can't digest cellulose.
1.5 Lipids: Why lipids are NOT polymers. Triglycerides, phospholipids, steroids, and why steroids skip transport proteins.
1.5 Lipids  ·  Why lipids are NOT polymers. Triglycerides, phospholipids, steroids, and why steroids skip transport proteins.
1.6 Nucleic Acids: DNA vs RNA, base pairing, Chargaff's rules — and the canonical %G = %C = (100 − 2×%A) ÷ 2.
1.6 Nucleic Acids  ·  DNA vs RNA, base pairing, Chargaff's rules — and the canonical %G = %C = (100 − 2×%A) ÷ 2.
1.7 Proteins: Four levels of protein structure, why denaturation does NOT break peptide bonds, the seven major protein functions.
1.7 Proteins  ·  Four levels of protein structure, why denaturation does NOT break peptide bonds, the seven major protein functions.
Sprint Practice — Mixed Questions: Three cross-topic practice items mixing macromolecules, DNA chemistry, and the lipid-not-a-polymer trap.
Sprint Practice — Mixed Questions  ·  Three cross-topic practice items mixing macromolecules, DNA chemistry, and the lipid-not-a-polymer trap.
Final Review — Exam Traps + Checklist: Top exam traps for Unit 1, self-check list across topics, and the final sprint strategy framing.
Final Review — Exam Traps + Checklist  ·  Top exam traps for Unit 1, self-check list across topics, and the final sprint strategy framing.

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