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AP Biology

Unit 2 Exam-Style Practice

Shared by Ashton · Oct 20, 2026 · 0 plays

Test-style questions built on experiments and data: cell fusion, aquaporin eggs, beet membranes, water potential in neighboring cells and lab design.

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45 questions across 11 sections. After every answer you’ll see why each choice is right or wrong, not just the one you picked.

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Sections (none selected means all)

Sample questions

Open a question to see the answer choices and the correct answer.

Cells are treated with a drug that inhibits only the smooth ER. Which cell type would be most disrupted?
  1. A. A cell that secretes protein antibodies
  2. B. A cell that secretes steroid hormones ✓
  3. C. A cell that mainly digests bacteria
  4. D. A cell that mainly stores water

Correct answer: B. Steroids are lipids made from cholesterol, and lipid synthesis is the smooth ER's job. Steroid-secreting cells (like those in the testes and adrenal glands) are packed with smooth ER.

A researcher measures the share of cell volume taken up by organelles in three cell types. Cell X: 30% rough ER. Cell Y: 25% smooth ER. Cell Z: 35% mitochondria. Which pairing is most reasonable?
  1. A. X is heart muscle; Y makes digestive enzymes; Z makes steroids
  2. B. X makes steroids; Y is heart muscle; Z makes digestive enzymes
  3. C. X makes digestive enzymes; Y is heart muscle; Z makes steroids
  4. D. X makes digestive enzymes; Y makes steroids; Z is heart muscle ✓

Correct answer: D. Secreted proteins need lots of rough ER, steroids need smooth ER, and heart muscle's constant contraction needs a lot of ATP from mitochondria.

A protein is tagged with green fluorescent protein (GFP). Under the microscope, the glow forms a ring around the nucleus and a network of tubes and sacs through the cytoplasm. Where is the protein?
  1. A. In the mitochondria
  2. B. In the lysosomes and vesicles
  3. C. In the endoplasmic reticulum ✓
  4. D. In the nucleolus

Correct answer: C. The ER is a network of tubes and flattened sacs that is continuous with the outer nuclear membrane, so it outlines the nucleus and spreads through the cytoplasm.

Plant cells are given radioactive thymidine, a building block used only to make DNA. Besides the nucleus, where would the label show up?
  1. A. Golgi and ER
  2. B. Ribosomes and lysosomes
  3. C. Central vacuole and cell wall
  4. D. Mitochondria and chloroplasts ✓

Correct answer: D. Mitochondria and chloroplasts carry their own DNA and copy it when they divide, so they take up the label as well.

A drug blocks the proton pumps that keep the inside of lysosomes acidic (about pH 5). What would most likely happen over time?
  1. A. Lysosomal enzymes start digesting the cytosol
  2. B. The cell makes more ATP from the extra hydrogen ions
  3. C. Undigested material builds up inside the lysosomes ✓
  4. D. Ribosomes stop making new lysosomal enzymes

Correct answer: C. Lysosomal enzymes work best at low pH. If the pH rises toward 7, they slow down, and the material they would normally break down accumulates.