4. What\'s the difference between active and passive transport? 5. What molecule

Question

4. What's the difference between active and passive transport? 5. What molecules are permeable to cell membrane? What molecule are impermeable to cell membrane? How do they cross plasma membrane? 6. How do the transporters and ion channels move molecules across cell membrane? (Hint: both transporter and ion channels are proteins) 7. How to make NO and estrogen perform its function? That is, what is the underlying mechanism? 8. What are uniport, symport and antiport? 9. How to transport glucose from intestinal lumen into cells in microvilli, then from microvilli cells out to enter blood vessel? 10. Why cells have membrane potential? Which ions are high inside? Which ions are low inside?

Explanation / Answer

4) Passive Transport moves ions from high concentration to low without using any metabolic energy. whereas active Transport involves the movement of ions from low concentration to high concentration using ATP.

5) Plasma membranes are selectively permeable and allows non polar molecules (hydrophobic molecules) and small polar molecules to pass through it freely. Large polar molecules and charged ions can not pass through the plasma membrane. The neutral and non polar molecules pass through the semi permeabe membrane though the process of diffusion while the polar molecules pass through the phopholipid bilayer of plsma membrane by facilitated diffusion.

8) Uniport is transfer of single substance in a single direction along the membrane.

Symport is the movement of two substances and both moving in the same direction.

Antiport is the movement of thwo substances moving in opposite directions.

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