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Free AP Biology
Practice Paper

8 mixed-difficulty practice questions in the style of real AP papers — answers, mark-scheme-style explanations, and the official exam structure all on one page.

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What the real AP Biology paper looks like

Paper 1
Objective and short-answer questions covering the breadth of the specification.
Paper 2
Structured and extended-response questions testing depth of understanding.
Total exam time varies by board and tier — typically 2.5 to 3.5 hours.
Grading: See the official board specification for the current grading scale.

Mini practice paper: 8 questions

Mixed-difficulty questions from across the Biology syllabus. Tap "Show answer" after each to check yourself.

Q1 · Difficulty 1/3

The building blocks of nucleic acids are:

  1. Amino acids
  2. Nucleotides
  3. Glycerol
  4. Steroids
Show answer & explanation
✓ Answer: B — Nucleotides
DNA and RNA are polymers of nucleotides (sugar, phosphate, nitrogenous base).
Q2 · Difficulty 1/3

Which element's bonding versatility makes it central to organic molecules?

  1. Hydrogen
  2. Carbon
  3. Oxygen
  4. Nitrogen
Show answer & explanation
✓ Answer: B — Carbon
Carbon forms four covalent bonds, enabling diverse stable molecular skeletons.
Q3 · Difficulty 1/3

The monomers of proteins are:

  1. Nucleotides
  2. Amino acids
  3. Monosaccharides
  4. Fatty acids
Show answer & explanation
✓ Answer: B — Amino acids
Proteins are polymers of amino acids linked by peptide bonds.
Q4 · Difficulty 2/3

Saturated fatty acids differ from unsaturated in that they:

  1. Contain double bonds
  2. Have no C–C double bonds
  3. Are always liquid at room temperature
  4. Contain nitrogen
Show answer & explanation
✓ Answer: B — Have no C–C double bonds
Saturated fats have no carbon–carbon double bonds, so chains pack tightly (solid at room temp).
Q5 · Difficulty 2/3

The primary structure of a protein refers to its:

  1. Alpha helices and beta sheets
  2. Sequence of amino acids
  3. 3-D folded shape
  4. Assembly of subunits
Show answer & explanation
✓ Answer: B — Sequence of amino acids
Primary structure is the linear amino acid sequence.
Q6 · Difficulty 2/3

Which bond joins two monosaccharides?

  1. Peptide bond
  2. Glycosidic bond
  3. Phosphodiester bond
  4. Ester bond
Show answer & explanation
✓ Answer: B — Glycosidic bond
A glycosidic bond links sugars via dehydration synthesis.
Q7 · Difficulty 3/3

Hydrogen bonds in water are responsible for its high specific heat because they:

  1. Break easily without energy
  2. Absorb heat as they break, resisting temperature change
  3. Prevent evaporation entirely
  4. Make water nonpolar
Show answer & explanation
✓ Answer: B — Absorb heat as they break, resisting temperature change
Energy goes into breaking H-bonds rather than raising temperature, giving water high specific heat.
Q8 · Difficulty 3/3

A phospholipid is amphipathic, meaning it has:

  1. Only hydrophobic regions
  2. Only hydrophilic regions
  3. Both hydrophilic and hydrophobic regions
  4. No charge anywhere
Show answer & explanation
✓ Answer: C — Both hydrophilic and hydrophobic regions
A hydrophilic phosphate head and hydrophobic fatty-acid tails make phospholipids amphipathic.
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AP Biology FAQ

What does the AP Biology exam look like?
The AP Biology exam is structured across 2 components. Paper 1: Objective and short-answer questions covering the breadth of the specification. Paper 2: Structured and extended-response questions testing depth of understanding. Total exam time varies by board and tier — typically 2.5 to 3.5 hours.
Can I download a free AP Biology past paper?
Real AP past papers are published directly by AP on their official website. Kramizo doesn't redistribute copyrighted past papers, but we do generate free AI-written practice papers in the exact same style — same command words, same difficulty tier, same mark conventions. Use this practice paper as warm-up, then time yourself on official past papers before exam day.
How is AP Biology graded?
See the official board specification for the current grading scale. Kramizo's practice questions are tagged with difficulty 1-3 mapping roughly to the lower, middle, and top grade boundaries you'll encounter in the real exam.