Multiple choice

The cell membrane is selectively permeable because

  1. only certain particles can pass through it

  2. particles can quickly pass through it

  3. all particles can slowly pass through it

  4. only nutrient molecules can pass through it
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A Correct answer
Explanation

The cell membrane is selectively permeable because it allows only certain types of molecules to pass through, based on factors like size, polarity, and charge. Small nonpolar molecules diffuse easily, while ions and large polar molecules require transport proteins. It does not allow all particles to pass, nor is it limited to only nutrients.

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