6- b 7-c 8-d 9-c 6. True or False: Secondary active transport directly utilizes

Question

6- b 7-c 8-d 9-c 6. True or False: Secondary active transport directly utilizes ATP A. True B. False 7. The sodium-potassium pump B. transport Na+ into the cell C. transports K+ into the cell D. transport equal number of Na+ and K+ across the membrane E. is an example of secondary active transport 8.Which of the following factors does NOT influence the rate of simple diffusion of molecules across a membrane? A. permeability of the membrane to the molecules B. magnitude of the driving force on the molecules C. membrane surface area D. active transport of the molecules 9. Cell membranes allow certain molecules to pass, while blocking others. This property is called A) impermeable. B) freely permeable. C) selectively permeable. D) actively permeable. E) none of the above

Explanation / Answer

6) A True. Active transport utilizes energy, ATP, for the transport of ions/molecules against the concentration gradient. Scondary active transportoccurs when endergonic transport of one solute is coupled to exergonic flow of a different solute that was pumped by primary active transport.

7) C. Transport K+ inside the cell. Cell has lower Na+ concentration and high K+ concentration inside and vice-versa in outside. Na+-K+ ATPase utilizes ATP, for the transport of two K+in side and three Na+ outside the cell. It is an example of primary active transport.

8) D. Active transport of molecules. Simple diffusion is the movement of molecules across the selectively permeable membrane along the concentration gradient from higher concentration to lpower concentration without utilizing energy, ATP.

9) C selectively permeable.

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