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.****
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.
The correct statement is d. During passive transport, osmosis allows salts to move from one side of the membrane to the other to equalize concentrations on both sides.
To explain how to determine the correct answer, let's break down each statement:
a. During active transport, a material may be moved from an area of low concentration to an area of high concentration.
This statement is incorrect because active transport requires energy and is responsible for moving materials against the concentration gradient, from an area of low concentration to an area of high concentration.
b. During passive transport, energy is used to move material against a concentration gradient.
This statement is incorrect. In passive transport, no energy is utilized to move materials against the concentration gradient. Instead, passive transport occurs spontaneously and follows the concentration gradient, moving materials from areas of high concentration to areas of low concentration.
c. During active transport, water is pumped across a membrane to equalize the concentration of salts on both sides.
This statement is incorrect. While active transport involves the movement of materials across a membrane, it does not specifically involve the pumping of water to equalize the concentration of salts.
d. During passive transport, osmosis allows salts to move from one side of the membrane to the other to equalize concentrations on both sides.
This statement is correct. Passive transport includes the process of osmosis, which is the movement of water across a selectively permeable membrane to balance the concentration of solutes (including salts) on both sides of the membrane.
Therefore, the correct answer is d. During passive transport, osmosis allows salts to move from one side of the membrane to the other to equalize concentrations on both sides.
The correct statement is:
d. During passive transport, osmosis allows salts to move from one side of the membrane to the other to equalize concentrations on both sides.