1- D 2- D 3-C 4-A 5-A 1. Simple diffusion A. moves molecules against electrochem
ID: 203146 • Letter: 1
Question
1- D 2- D 3-C 4-A 5-A 1. Simple diffusion A. moves molecules against electrochemical gradient. B. requires ATP hydrolysis C. requires carrier proteins D. is a passive process 2. A 4 molar solution contains approximately A. 6.0 X 10 power 23 particles B. 12 X 10 power 23 particle:s C. 18 X 10 power 23 particles D. 24 X 10 power 23 particles 3. A 3 M solution of NaCI would be equal to A. 1 Osm B. 3 Osm C. 6 Osmm D. 4 Osm 4. True or False: The rate of diffusion of a molecule into a cell membrane is increased by increasing the concentration of the molecule inside the cell A. True 5. The volume of a red blood cell placed in a hypertonic environment will A. decrease B. increase C. remain the same D. increase and then decrease B. FalseExplanation / Answer
1. Option D is correct.
Diffusion does not require energy. It occurs along the concentration gradient.
2. Option D is correct.
1 mole = 6.023 X 10^23 molecules
4 moles = 4 X 6.023 X 10^23 molecules
3. Option C is correct.
NaCl -----> Na+ + Cl-
1 M NaCl can produce 2 M ions.
So, Osmolarity = 3 X 2 = 6 Osm
4. FALSE
Diffusion is a passive process that occurs along the concentration gradient. If the solute concentration inside the cell increases, diffusion rate decreases.
5. Option A is correct.
If RBC is placed in a hypertonic solution, water from the cytosol moves out to the surroundings. This leads to shrinkage of the cell.
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