Q1 · Difficulty 1/3
Which organelle is the site of ATP production?
- Ribosome
- Mitochondrion
- Golgi apparatus
- Lysosome
Show answer & explanation
✓ Answer: B — Mitochondrion
Mitochondria carry out cellular respiration to make ATP.
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
The ultimate energy source for most ecosystems is:
- the sun
- glucose
- oxygen
- ATP
Show answer & explanation
✓ Answer: A — the sun
Sunlight powers photosynthesis at the base.
Q3 · Difficulty 1/3
The monomers of proteins are:
- Amino acids
- Monosaccharides
- Fatty acids
- Nucleotides
Show answer & explanation
✓ Answer: A — Amino acids
Proteins are polymers of amino acids linked by peptide bonds.
Q4 · Difficulty 1/3
Which element's bonding versatility makes it central to organic molecules?
- Carbon
- Oxygen
- Nitrogen
- Hydrogen
Show answer & explanation
✓ Answer: A — Carbon
Carbon forms four covalent bonds, enabling diverse stable molecular skeletons.
Q5 · Difficulty 1/3
During interphase the cell mostly:
- grows and copies DNA
- forms gametes
- dies
- divides
Show answer & explanation
✓ Answer: A — grows and copies DNA
Interphase: growth and DNA replication.
Q6 · Difficulty 1/3
An organism's observable traits make up its:
- genotype
- phenotype
- karyotype
- genome
Show answer & explanation
✓ Answer: B — phenotype
Phenotype = observable traits.
Q7 · Difficulty 1/3
Ribosomes are responsible for:
- Digestion
- Lipid synthesis
- Protein synthesis
- DNA replication
Show answer & explanation
✓ Answer: C — Protein synthesis
Ribosomes translate mRNA into protein.
Q8 · Difficulty 1/3
The three stages of cell signaling are reception, transduction, and:
- respiration
- reproduction
- replication
- response
Show answer & explanation
✓ Answer: D — response
Reception → transduction → response.
Build a 30-question timed mock →
Free · No signup · Instant marking
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.