1 Does the cell have a nucleus?
Yes
Eukaryotic cell.
No
Go to Step 2.
Where Prokaryotic vs Eukaryotic Cells Fits in Unit 2
The previous page, cell organelles and their functions, focused on major cell structures and the jobs they perform. This page asks which cells have those structures and how internal organization differs between prokaryotic and eukaryotic cells.
After this page, you will study surface area to volume ratio, which explains why cell size affects exchange efficiency. You will also connect cell type to membrane structure and transport later in Unit 2.
Current concept
Prokaryotic vs Eukaryotic Cells
Cell types differ in nucleus, organelles, size, and organization.
Learning Journey Checkpoint: Organization is the clue. Use nucleus presence, membrane-bound organelles, and DNA location to spot cell type before you explain function.
- 1 Unit 2 Hub: Cell Structure and Function
- 2 Osmosis and Tonicity
- 3 Cell Structure and Function
- 4 Cell Organelles and Their Functions
- 5 Prokaryotic vs Eukaryotic Cells You are here
- 6 Surface Area to Volume Ratio
- 7 Plasma Membrane Structure
- 8 Selective Permeability
- 9 Passive Transport and Diffusion
- 10 Active Transport
- 11 Cell Compartmentalization
- 12 Unit 2 Practice Questions
What Is the Difference Between Prokaryotic and Eukaryotic Cells?
The main difference between prokaryotic and eukaryotic cells is that eukaryotic cells have a nucleus and membrane-bound organelles, while prokaryotic cells do not. Both cell types have DNA, ribosomes, cytoplasm, and a plasma membrane.
For AP Biology, the fastest way to compare prokaryotic and eukaryotic cells is to check for a nucleus first, then membrane-bound organelles.
Say It Fast
- Prokaryotes: no nucleus
- Eukaryotes: nucleus present
- Both have DNA
- Both have ribosomes
- Both have cytoplasm
- Both have plasma membranes
- Prokaryotes are usually smaller
- Eukaryotes are usually more compartmentalized
AP Exam Clue: If a question says the cell has DNA and ribosomes but no nucleus, think prokaryotic cell.
The 5-Second Cell Type Decision Tree
When an AP Biology question gives you a cell description, do not start by memorizing every structure. Start with the fastest clue: nucleus or no nucleus. Then check for membrane-bound organelles, DNA location, and example type.
Cell type decision tree · start here
2 Does the cell have membrane-bound organelles like mitochondria, ER, Golgi, or chloroplasts?
Yes
Eukaryotic cell.
No
Go to Step 3.
3 Does the cell have DNA, ribosomes, cytoplasm, and a plasma membrane but no nucleus?
Answer
Prokaryotic cell.
4 Is the example bacteria or archaea?
Answer
Prokaryotic cell.
5 Is the example animal, plant, fungi, or protist?
Answer
Eukaryotic cell.
AP Exam Tip: The fastest clue is the nucleus. The most common trap is forgetting that prokaryotes still have ribosomes.
What Prokaryotic and Eukaryotic Cells Have in Common
Students often focus only on differences, but AP Biology questions also test shared features. Both cell types are living cells that must store genetic information, build proteins, carry out metabolism, and regulate exchange with the environment.
| Shared Feature | Why It Matters |
|---|---|
| DNA | Stores genetic information |
| Ribosomes | Build proteins |
| Cytoplasm | Holds many cell processes |
| Plasma membrane | Controls movement in and out |
| Metabolism | Cells process energy and materials |
| Genetic code | Both use DNA/RNA/protein systems |
Tip: Scroll sideways to see the full table.
Both cell types rely on the plasma membrane to control exchange. Review how structure supports function on the cell structure and function overview when you need the big-picture reasoning.
AP Exam Clue: Do not say prokaryotes are missing everything. They still have DNA, ribosomes, cytoplasm, and a plasma membrane.
Prokaryotic vs Eukaryotic Cells Comparison Chart
Use this chart as your main side-by-side comparison. The goal is not to memorize every row. The goal is to connect each difference to the clue that usually appears in AP-style questions.
| Feature | Prokaryotic Cells | Eukaryotic Cells |
|---|---|---|
| Nucleus | No nucleus | Nucleus present |
| DNA location | Nucleoid region | Nucleus |
| Membrane-bound organelles | No | Yes |
| Ribosomes | Yes | Yes |
| Plasma membrane | Yes | Yes |
| Cytoplasm | Yes | Yes |
| Typical size | Smaller | Larger |
| Examples | Bacteria and Archaea | Animals, plants, fungi, protists |
| Compartmentalization | Limited | High |
| Cell division | Binary fission | Mitosis or meiosis |
Tip: Scroll sideways to see the full table.
AP Exam Clue: The best single clue is the nucleus. If a cell has a nucleus, it is eukaryotic. If it lacks a nucleus, it is prokaryotic.
How to Identify a Prokaryotic Cell
Prokaryotic cells are usually smaller and simpler in internal organization. They do not have a nucleus or membrane-bound organelles. Their DNA is usually found in a nucleoid region. They still have ribosomes, cytoplasm, and a plasma membrane.
Common examples: Bacteria and Archaea.
Prokaryotic cell clue list
- No nucleus
- Nucleoid region
- Circular DNA
- Ribosomes present
- Small cell size
- Bacteria or archaea mentioned
- No membrane-bound organelles
AP Exam Trap: Do not say prokaryotes have no organelles if the question includes ribosomes. More precise wording: prokaryotes lack membrane-bound organelles.
How to Identify a Eukaryotic Cell
Eukaryotic cells have a nucleus and membrane-bound organelles. These compartments help organize cellular work. Eukaryotic cells are usually larger and more complex than prokaryotic cells.
Common examples: Animal cells, plant cells, fungal cells, and protist cells.
Eukaryotic cell clue list
- Nucleus present
- Mitochondria present
- ER or Golgi present
- Chloroplasts in plant or algae cells
- Membrane-bound organelles
- Larger cell size
- Compartmentalization
For organelle names and jobs, return to the cell organelles and their functions guide. This page focuses on cell type, not a full organelle chart.
AP Exam Trap: All animals, plants, fungi, and protists are eukaryotes, but not all eukaryotes have chloroplasts.
Why Eukaryotic Cells Use Compartments
Eukaryotic cells are larger and more complex, so internal compartments help organize cell processes. Membrane-bound organelles create specialized spaces for DNA storage, protein processing, ATP production, photosynthesis, digestion, and transport.
Compartments organize cell work by separating incompatible processes and concentrating enzymes where they are needed. For a deeper explanation of why eukaryotes use internal compartments, see the cell compartmentalization guide.
AP Exam Clue: Compartmentalization increases efficiency by separating processes into specialized areas.
Common Mistakes About Prokaryotic vs Eukaryotic Cells
Many missed points come from vague wording about organelles or DNA. Use this table to upgrade weak phrases into AP-ready explanations.
| Mistake | Better AP Biology Understanding |
|---|---|
| "Prokaryotes have no organelles at all" | Prokaryotes lack membrane-bound organelles but have ribosomes |
| "All cells have a nucleus" | Only eukaryotic cells have a nucleus |
| "Only eukaryotes have DNA" | Both cell types have DNA |
| "Only eukaryotes have ribosomes" | Both cell types have ribosomes |
| "Bacteria are eukaryotes" | Bacteria are prokaryotes |
| "All eukaryotes have chloroplasts" | Plants and algae have chloroplasts; animals and fungi do not |
| "Prokaryotes are not alive" | Prokaryotes are living cells |
Tip: Scroll sideways to see the full table.
Cell Type Diagnosis Lab: Prokaryotic or Eukaryotic?
Use the decision tree first, then reveal the answer. Read each scenario, predict the cell type, then check your reasoning—the same approach AP Biology uses in data questions and short free response.
0 of 10 scenarios diagnosed
A cell has DNA, ribosomes, cytoplasm, and a plasma membrane, but no nucleus.
Answer: Prokaryotic cell.Clue used: no nucleus.
A cell has a nucleus, mitochondria, ER, and Golgi apparatus.
Answer: Eukaryotic cell.Clue used: nucleus and membrane-bound organelles.
A bacterial cell divides by binary fission.
Answer: Prokaryotic cell.Clue used: bacteria.
A plant cell contains chloroplasts and a large central vacuole.
Answer: Eukaryotic cell.Clue used: chloroplasts and central vacuole.
A cell has ribosomes but no membrane-bound organelles.
Answer: Prokaryotic cell.Clue used: ribosomes present, no membrane-bound organelles.
A fungal cell has a nucleus and mitochondria.
Answer: Eukaryotic cell.Clue used: nucleus and fungi are eukaryotes.
A cell has circular DNA in a nucleoid region.
Answer: Prokaryotic cell.Clue used: nucleoid region instead of a nucleus.
A cell has mitochondria but no chloroplasts.
Answer: Eukaryotic cell, likely animal or fungal depending on other clues.Clue used: mitochondria are membrane-bound organelles.
A cell lacks a nucleus but can build proteins.
Answer: Prokaryotic cell because ribosomes are present.Clue used: no nucleus, but ribosomes still build proteins.
A cell uses internal organelles to separate different processes.
Answer: Eukaryotic cell.Clue used: compartmentalization with membrane-bound organelles.
Prokaryotic vs Eukaryotic Cells Practice Questions
Answer all ten questions. Choices shuffle each time you reload, so focus on reasoning—not letter memorization.
Question 1 of 10
Start
Correct: 0
Answered: 0
Streak: 0
Accuracy: 0%
AP-Style FRQ Practice: Prokaryotic vs Eukaryotic Cells
Open each card, draft your response, then reveal the rubric and sample when ready. In comparison FRQs, do not just list features. Explain how each feature affects cell organization or function.
0 of 2 FRQs opened
Prompt
- Identify one structure found in both prokaryotic and eukaryotic cells.
- Identify one structure found in eukaryotic cells but not prokaryotic cells.
- Explain why ribosomes are important in both cell types.
- Explain how compartmentalization can benefit eukaryotic cells.
Tip: Name the structure, describe the function, and explain how that function helps the cell.
Scoring rubric (4 points)
- 1 pt — Accept DNA, ribosomes, cytoplasm, or plasma membrane.
- 1 pt — Accept nucleus or membrane-bound organelles.
- 1 pt — Ribosomes build proteins needed for cell function.
- 1 pt — Compartmentalization separates processes into specialized spaces, increasing organization and efficiency.
Sample response
Sample response: Both prokaryotic and eukaryotic cells have ribosomes that build proteins. Eukaryotic cells also have a nucleus that stores DNA separately from the cytoplasm. Ribosomes are important in both cell types because proteins carry out most cell functions. Compartmentalization benefits eukaryotic cells by separating processes such as DNA storage, protein processing, and ATP production into specialized membrane-bound spaces.
Self-check before you reveal
Status: Draft your answer first—then open the rubric or sample.
Prompt
- Describe one clue that indicates a cell is prokaryotic.
- Describe one clue that indicates a cell is eukaryotic.
- Explain why saying "prokaryotes have no organelles" can be misleading.
- Explain why cell structure affects cell function.
Tip: Use clue language from the diagnosis lab, then explain mechanism.
Scoring rubric (4 points)
- 1 pt — No nucleus, nucleoid region, circular DNA, bacteria/archaea, or lack of membrane-bound organelles.
- 1 pt — Nucleus, mitochondria, ER, Golgi, or membrane-bound organelles.
- 1 pt — Prokaryotes lack membrane-bound organelles but still have ribosomes.
- 1 pt — Structures allow cells to perform specific functions such as protein synthesis, transport, or energy processing.
Sample response
Sample response: A prokaryotic cell lacks a nucleus and often has DNA in a nucleoid region. A eukaryotic cell has a nucleus and membrane-bound organelles such as mitochondria. Saying prokaryotes have no organelles is misleading because they still have ribosomes, which build proteins. Cell structure affects function because specialized structures allow cells to store DNA, synthesize proteins, process energy, and regulate transport in organized ways.
Self-check before you reveal
Status: Draft your answer first—then open the rubric or sample.
FRQ Tip
In comparison FRQs, do not just list features. Explain how each feature affects cell organization or function.
FAQs About Prokaryotic vs Eukaryotic Cells
What is the main difference between prokaryotic and eukaryotic cells?
The main difference is that eukaryotic cells have a nucleus and membrane-bound organelles, while prokaryotic cells do not.
Do prokaryotic cells have ribosomes?
Yes. Prokaryotic cells have ribosomes, which build proteins. Ribosomes are not membrane-bound organelles.
Do prokaryotic cells have DNA?
Yes. Prokaryotic cells have DNA, usually located in a nucleoid region instead of a nucleus.
Do eukaryotic cells have ribosomes?
Yes. Eukaryotic cells have ribosomes, cytoplasm, DNA, and a plasma membrane, along with a nucleus and membrane-bound organelles.
Are bacteria prokaryotic or eukaryotic?
Bacteria are prokaryotic cells.
Are animal cells prokaryotic or eukaryotic?
Animal cells are eukaryotic cells because they have a nucleus and membrane-bound organelles.
Are plant cells prokaryotic or eukaryotic?
Plant cells are eukaryotic cells because they have a nucleus and membrane-bound organelles. Many plant cells also have chloroplasts, a cell wall, and a large central vacuole.
What do prokaryotic and eukaryotic cells have in common?
Both cell types have DNA, ribosomes, cytoplasm, and a plasma membrane.
Why are eukaryotic cells more compartmentalized?
Eukaryotic cells are more compartmentalized because they use membrane-bound organelles to separate and organize different cell processes.
Before You Move On
- Can you identify the cell type from nucleus presence?
- Can you explain why prokaryotes still have ribosomes?
- Can you name four features both cell types share?
- Can you explain why eukaryotes are more compartmentalized?
- Can you avoid calling bacteria eukaryotic?
If yes, you are ready for surface area-to-volume ratio.
Prokaryotic vs Eukaryotic Cells: Final Review
- Prokaryotic cells lack a nucleus
- Eukaryotic cells have a nucleus
- Prokaryotic cells lack membrane-bound organelles
- Eukaryotic cells have membrane-bound organelles
- Both cell types have DNA
- Both cell types have ribosomes
- Both cell types have cytoplasm
- Both cell types have a plasma membrane
- Bacteria and Archaea are prokaryotes
- Animals, plants, fungi, and protists are eukaryotes
- Strong AP answers compare structure and explain function
You now know how to compare prokaryotic and eukaryotic cells. Continue with Surface Area to Volume Ratio, or test yourself with Unit 2 practice questions.