Question

dok 2 - 3 questions: 5. what does \semipermeable\ mean? 6. why is the cell membrane considered semipermeable? 7. what type of molecules move during osmosis? 8. what kinds of molecules might not be able to pass through without help?

Explanation:

"Semipermeable" means allowing certain substances to pass through while blocking others. The cell membrane is semipermeable because it has specific protein - based channels and pores that control the entry and exit of substances based on size, charge, and solubility. During osmosis, water molecules move. Large, polar, and charged molecules like proteins, nucleic acids, and ions might not be able to pass through the cell membrane without the help of transport proteins.

Answer:

1. Allowing certain substances to pass through while blocking others.
2. It has specific protein - based channels and pores that control the entry and exit of substances based on size, charge, and solubility.
3. Water molecules.
4. Large, polar, and charged molecules like proteins, nucleic acids, and ions.