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📝 Prokaryotic vs eukaryotic cells differences (7 MCQs)

📖 From Campbell Biology • 1. Evolution and the theme of Biology and Scientific Inquiry • 7 questions available

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What is Prokaryotic vs eukaryotic cells differences?

Definition:
Prokaryotic and eukaryotic cells are two major cellular organizations. Prokaryotic cells generally lack a membrane-bound nucleus and membrane-bound organelles, whereas eukaryotic cells contain a nucleus and various membrane-bound organelles that organize specialized cellular processes.

Working:
In prokaryotes, DNA is located in a nucleoid region, while eukaryotic DNA is enclosed within a nucleus. Both cell types contain DNA, ribosomes, cytoplasm, and a plasma membrane.

Example:
A bacterium is prokaryotic, while a human skin cell is eukaryotic. The bacterial DNA is not enclosed by a nuclear membrane, whereas the skin-cell DNA is inside a nucleus.

Reason:
The difference in cellular organization affects how genetic information is stored, processed, and how cellular activities are separated into specialized compartments.

Easy

Medium

Hard

📝 All Prokaryotic vs eukaryotic cells differences MCQs

Q1. A researcher observes a cell with DNA located in a nucleoid region, ribosomes, a plasma membrane, and no membrane-bound organelles. Which conclusion is best supported by these observations?

A.The cell is eukaryotic because it contains DNA and ribosomes

B.The cell is prokaryotic because its genetic material is not enclosed by a membrane-bound nucleus ✅

C.The cell must be eukaryotic because all cells contain membrane-bound organelles

D.The cell cannot be classified because ribosomes occur only in eukaryotes

💡 Difficulty: easy | ✅ Correct: B

📖 Explanation: The absence of a membrane-bound nucleus, together with DNA concentrated in a nucleoid region, strongly supports a prokaryotic organization. DNA and ribosomes occur in both cell types, so those features alone cannot distinguish them reliably.

Q2. Two cells are placed in identical nutrient solutions. Cell X rapidly produces proteins, while Cell Y shows evidence of extensive RNA processing before proteins are produced. Which structural difference most plausibly explains the observation?

A.Cell X has a nucleus that separates transcription from translation

B.Cell Y has membrane-bound compartments that allow transcription and RNA processing to be separated from translation ✅

C.Cell X lacks ribosomes, so translation occurs directly on DNA

D.Cell Y lacks DNA, so RNA processing replaces transcription

💡 Difficulty: medium | ✅ Correct: B

📖 Explanation: Eukaryotic cells possess a nucleus and associated processing machinery that can separate transcription and RNA processing from translation. Prokaryotic cells generally lack this membrane-bound nuclear compartment, allowing transcription and translation to be more closely coupled.

Q3. A scientist wants to express a eukaryotic gene in a prokaryotic cell. The gene normally produces an RNA molecule containing introns that must be removed before translation. Which approach is most likely to succeed?

A.Insert the unmodified gene and assume the prokaryotic cell will always remove introns identically

B.Use a processed version of the gene that lacks introns before introducing it into the prokaryotic cell ✅

C.Remove the promoter because prokaryotic cells do not use DNA

D.Replace all DNA with RNA before introducing the gene

💡 Difficulty: medium | ✅ Correct: B

📖 Explanation: Many eukaryotic genes contain introns that are removed during RNA processing. Because prokaryotic cells generally do not perform eukaryotic-style nuclear RNA processing, introducing a processed gene lacking introns is more likely to produce a functional transcript.

Q4. A student claims, \Eukaryotic cells are more advanced because they are larger, whereas prokaryotic cells are simpler and therefore cannot perform complex chemical reactions.\" Which evaluation is most accurate?"

A.The claim is correct because cell size directly determines biochemical complexity

B.The claim is incorrect because prokaryotes lack DNA and therefore cannot regulate metabolism

C.The claim is partly flawed because prokaryotes can perform complex metabolic processes despite lacking membrane-bound organelles ✅

D.The claim is correct because only eukaryotes contain enzymes

💡 Difficulty: hard | ✅ Correct: C

📖 Explanation: The reasoning incorrectly equates structural simplicity with biochemical simplicity. Prokaryotic cells lack membrane-bound organelles but can carry out sophisticated metabolic pathways, regulate genes, maintain gradients, and respond to environmental changes.

Q5. A graph records the average cell volume and DNA-containing-region volume for two cell populations. Population A has cell volume 2 units and DNA-region volume 0.4 units; Population B has cell volume 20 units and DNA-region volume 4 units. Which interpretation is most justified?

A.Both populations must be prokaryotic because their DNA-region proportions are identical

B.Both populations must be eukaryotic because their DNA-region proportions are identical

C.The graph alone cannot reliably distinguish cell type because relative volume measurements do not establish whether DNA is enclosed by a membrane ✅

D.Population A must be prokaryotic because smaller cells always lack nuclei

💡 Difficulty: hard | ✅ Correct: C

📖 Explanation: Both populations have the same DNA-region-to-cell-volume ratio, but that numerical relationship does not reveal whether the DNA is enclosed within a membrane-bound nucleus. Structural evidence about compartmentalization is needed for classification.

Q6. An antibiotic prevents bacterial cells from producing proteins by interfering with their ribosomes. A researcher notices that human cells are much less affected at the same concentration. Which explanation best integrates cellular structure and selective drug action?

A.Human cells do not contain ribosomes

B.Human cells have ribosomes with structural differences that can reduce the antibiotic's binding while bacterial ribosomes remain susceptible ✅

C.Human cells contain DNA instead of ribosomes

D.Bacteria are affected only because they lack a plasma membrane

💡 Difficulty: hard | ✅ Correct: B

📖 Explanation: Both bacteria and human cells require ribosomes for protein synthesis, but their ribosomes differ in structure. A drug designed to bind a bacterial ribosomal feature can therefore inhibit bacterial translation more strongly than translation in human cells.

Q7. A newly discovered cell contains DNA, ribosomes, a plasma membrane, and internal membrane-bound compartments. However, the researcher concludes it is prokaryotic solely because the cell is small. What is the strongest correction?

A.Cell size is sufficient because all small cells are prokaryotic

B.The presence of internal membrane-bound compartments provides stronger evidence for eukaryotic organization than size alone ✅

C.Small cells cannot contain DNA

D.Any cell containing ribosomes must be prokaryotic

💡 Difficulty: hard | ✅ Correct: B

📖 Explanation: Cell size can overlap between prokaryotic and eukaryotic organisms, so it is not a definitive classification criterion. Membrane-bound internal compartments are much stronger structural evidence for eukaryotic cellular organization.

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