Which of the statements is true? a. During active transport, a material may be moved from an area of low concentration to an areaz of high concentration. b. During passive transport, energy is used to move material against a concentration gradient. c. During active transport, water is pumped across a membrane to equalize the concentration of salts on both sides. d. During passive transport, osmosis allows salts to move from one side of the membrane to the other to equalize concentrations on both sides.****

Question

Which of the statements is true?  a. During active transport, a material may be moved from an area of low concentration to an areaz of high concentration.  b. During passive transport, energy is used to move material against a concentration gradient.  c. During active transport, water is pumped across a membrane to equalize the concentration of salts on both sides.  d. During passive transport, osmosis allows salts to move from one side of the membrane to the other to equalize concentrations on both sides.****

Anonymous · Answer

Maybe you should explain why you think answer choices are wrong and why you think an answer choice is correct. During active transport, materials are moved against their concentration gradient using ATP, a source of energy. This fact should eliminate answer choices B and C. Osmosis and passive transport are two different things: passive transport allows for the movement of salts, ions etc across a semipermeable membrane. Osmosis allows for the movement of water to regions were solute concentrations are higher making solute to water concentrations equal on both sides of the membrane. This difference between the two eliminates answer choice D as well.