Question

which of these statements is true about prokaryotes and eukaryotes?
○ they are both about the same size and have different internal structures.
○ prokaryotes are smaller and lack the internal compartments that eukaryotes have.
○ prokaryotes have a nucleus, whereas eukaryotes do not.
○ they are both about the same size and have similar internal structures.
○ both prokaryotes and eukaryotes have internal compartments enveloped in membranes.

Explanation:

1. Analyze the first option: Prokaryotes are generally much smaller than eukaryotes, so "same size" is incorrect. Eliminate this.
2. Analyze the second option: Prokaryotes are smaller (e.g., bacteria vs. eukaryotic cells like plant/animal cells) and lack membrane - bound internal compartments (organelles) that eukaryotes have (like nucleus, mitochondria, etc.). This is consistent with cell biology knowledge.
3. Analyze the third option: Prokaryotes do not have a nucleus (their genetic material is in a nucleoid), while eukaryotes do have a nucleus. So this statement is reversed. Eliminate this.
4. Analyze the fourth option: As mentioned, prokaryotes are smaller and have different internal structures (no membrane - bound organelles) compared to eukaryotes. So "same size" and "similar internal structures" are wrong. Eliminate this.
5. Analyze the fifth option: Prokaryotes lack membrane - bound internal compartments, while eukaryotes have them (like nucleus, endoplasmic reticulum, etc.). So this is incorrect. Eliminate this.

Answer:

B. Prokaryotes are smaller and lack the internal compartments that eukaryotes have.