Question

7 which statement best compares the plasma membrane in prokaryotes and eukaryotes? a the plasma membrane is a single layer of lipids in prokaryotes, but it is a bilayer in eukaryotes. b the plasma membrane in both prokaryotes and eukaryotes separates the cell from the external environment. c the plasma membrane is lined with ribosomes in prokaryotes, but it is lined with lipids in eukaryotes. d the plasma membrane in both prokaryotes and eukaryotes contains chloroplasts for starch storage.

Explanation:

• Option A: Both prokaryotes and eukaryotes have a plasma membrane bilayer. So this option is incorrect.
• Option B: As mentioned above, both have a bilayer. This option is wrong.
• Option C: The plasma membrane (cell membrane) in all cells (prokaryotes and eukaryotes) has the basic function of separating the cell's internal environment from the external environment. This is a correct and fundamental property.
• Option D: Plasma membranes do not contain chloroplasts (chloroplasts are organelles in plant cells for photosynthesis). Also, ribosomes are not lining the plasma membrane in a specific way as described here. This option is incorrect.

Answer:

C. The plasma membrane in both prokaryotes and eukaryotes separates the cell from the external environment.