Question

multiple choice question
capsules are typically ______.

• well organized
• composed of lipids
• more rigid than the cell wall
• only visible with an electron microscope

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Explanation:

To solve this, we analyze each option:

• "Well organized": Capsules (in prokaryotes, like bacterial capsules) are not typically described as "well - organized" in a distinct structural sense compared to other cell components.
• "Composed of lipids": Capsules are usually composed of polysaccharides (or sometimes polypeptides), not lipids. Lipids are more associated with cell membranes.
• "More rigid than the cell wall": The cell wall (e.g., in bacteria) is more rigid as it provides structural support. Capsules are relatively less rigid and more gelatinous.
• "Only visible with an electron microscope": Capsules are often too thin or have a low contrast to be seen with a light microscope and require special staining or an electron microscope for clear visualization.

Answer:

D. only visible with an electron microscope