elitated diffusion, the number of carriers has no effect at the rate of diffus i
ID: 3512106 • Letter: E
Question
elitated diffusion, the number of carriers has no effect at the rate of diffus ion. a. True False 8. Solutes of different masses diffuse at the same rate if concentration grad ients are the same. a. True b. False 9. During osmosis: Water moves from dilute to concentrated solution a. b. Solute moves from dilute to concentrated solution -c. Water moves from concentrated to dilute solution d. Solute moves from concentrated to dilute solution 10. Energy is required for diffusion and osmosis. a. True b. False 1. Energy is required to move molecules aga inst a concentration gradient. a True b) False 12. Lipid-soluble molecules (e-g. steroids) can easily move across plasma membrane. a) True b) False 13. A regular sloping curve in the graph during diffusion experiment in the lab with various concentrations of solutes (e.g. Na+) suggests: a) Co-relation with concentration gradient b) No co-re lation with concentration gradient c) Intermittent co-relation with concentration gradient d) None of the above 14. All of the followings are "non-penetrating" molecules EXCEPT a) Sodium b) Potassium c) Oxygen d) Urea of penetrating and non-penetrating molecules. 15. Tonicity is dependent on the presence of penetrating and a) True b) FalseExplanation / Answer
Answer-7 (b) False
Explanation-
In facilitated diffusion, the rate of diffusion depends on number of carrier proteins. On increasing the number of carrier proteins the diffusion rate increases whereas on decreasing the number of carrier proteins the diffusion rate decreases.
Answer-10 (B) False
Explanation-
Diffusion is a spontaneous mechanism and osmosis is a type of diffusion. Both the processes do not require energy to take place.
Answer-11 (A) True
Explanation-
Active transport requires energy in the form pf ATP to move molecules against there concentration gradient or in a bulk amount.
Answer-12 (A) True
Explanation-
Molecules move passively through the plasma membrane if they are either lipid soluble molecule or they are small enough to pass through the membrane pores.
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