Question

what is a difference between prokaryotic and eukaryotic cells?
a. eukaryotic cells do not have membrane - bound organelles, but prokaryotic cells do.

b. prokaryotic cells do not have a nucleus, but eukaryotic cells do.

c. organisms with eukaryotic cells are always multicellular, but organisms with prokaryotic cells are not.

d. prokaryotic cells always have cell walls, but eukaryotic cells do not.

Explanation:

• Option A: Eukaryotic cells have membrane - bound organelles (like nucleus, mitochondria), while prokaryotic cells do not. So A is wrong.
• Option B: Prokaryotic cells lack a true nucleus (their genetic material is in a nucleoid region), and eukaryotic cells have a well - defined, membrane - bound nucleus. This is a key difference.
• Option C: There are single - celled eukaryotes (e.g., yeast, amoeba), so eukaryotic organisms are not always multicellular. C is wrong.
• Option D: Some eukaryotic cells (e.g., plant cells, fungal cells) have cell walls, so it's not true that prokaryotic cells always have cell walls and eukaryotic cells never do. D is wrong.

Answer:

B. Prokaryotic cells do not have a nucleus, but eukaryotic cells do.