Question

question 15
3 pts
which statement is true of eukaryotes but not of prokaryotes?
○ they are always single - celled.
○ they must be multicellular.
○ they must contain a nucleus.
○ they do not have membrane - bound organelles.

Explanation:

1. Analyze "They are always single - celled": Prokaryotes are mostly single - celled, but eukaryotes can be single - celled (like yeast) or multicellular. So this is not true for eukaryotes only.
2. Analyze "They must be multicellular": Eukaryotes can be single - celled (e.g., amoeba) or multicellular. So they are not always multicellular.
3. Analyze "They must contain a nucleus": Eukaryotic cells are defined by having a true nucleus (a membrane - bound nucleus containing genetic material), while prokaryotes have their genetic material in a nucleoid region without a nuclear membrane. This is a key difference.
4. Analyze "They do not have membrane - bound organelles": Prokaryotes lack membrane - bound organelles, while eukaryotes have them (like mitochondria, endoplasmic reticulum). So this is true for prokaryotes, not eukaryotes.

Answer:

C. They must contain a nucleus.