Q1 · Difficulty 1/3
Enzymes speed reactions by:
- Raising activation energy
- Lowering activation energy
- Adding heat
- Changing ΔG
Show answer & explanation
✓ Answer: B — Lowering activation energy
Enzymes lower the activation energy needed.
AP · · Biology
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.
Take a Mini Mock →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.
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.
Q2 · Difficulty 1/3
Roughly what percent of energy passes to the next trophic level?
- 1%
- 10%
- 50%
- 90%
Show answer & explanation
✓ Answer: B — 10%
About 10% transfers; the rest is lost as heat.
Q3 · Difficulty 1/3
Monomers of proteins are:
- nucleotides
- amino acids
- monosaccharides
- fatty acids
Show answer & explanation
✓ Answer: B — amino acids
Amino acids build proteins.
Q4 · Difficulty 1/3
The central dogma is:
- protein → RNA → DNA
- DNA → RNA → protein
- RNA → DNA → protein
- DNA → protein → RNA
Show answer & explanation
✓ Answer: B — DNA → RNA → protein
Information flows DNA → RNA → protein.
Q5 · Difficulty 1/3
The ultimate energy source for most ecosystems is:
- ATP
- the sun
- glucose
- oxygen
Show answer & explanation
✓ Answer: B — the sun
Sunlight powers photosynthesis at the base.
Q6 · Difficulty 1/3
Transcription produces:
- DNA
- mRNA
- protein
- lipids
Show answer & explanation
✓ Answer: B — mRNA
RNA polymerase makes mRNA from DNA.
Q7 · Difficulty 1/3
The powerhouse of the cell is the:
- nucleus
- mitochondrion
- Golgi
- ribosome
Show answer & explanation
✓ Answer: B — mitochondrion
Mitochondria produce ATP.
Q8 · Difficulty 1/3
Glucose has the molecular formula:
- C₆H₁₂O₆
- CH₄
- H₂O
- C₂H₆
Show answer & explanation
✓ Answer: A — C₆H₁₂O₆
Glucose is C₆H₁₂O₆.
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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.