Question

relate structure to function for the components of plant and animal cells. explain the role of cell membranes as a highly selective barrier (passive and active transport). if a substance is more concentrated in the cell than in the surroundings, which of the following processes would result in the movement of the substance into the cell? (sc.912.l.14.2) d. facilitated diffusion b. diffusion a. active transport c. osmosis

Explanation:

• Diffusion: Moves substances from high to low concentration. Here, substance is more concentrated in cell than surroundings, so diffusion (B) won't move it into cell.
• Facilitated diffusion: Also moves substances down concentration gradient (high to low). So facilitated diffusion (D) is not correct.
• Osmosis: Refers to movement of water across a semi - permeable membrane. The question is about a general substance, not just water. So osmosis (C) is incorrect.
• Active transport: Uses energy (e.g., ATP) to move substances against their concentration gradient (from low to high concentration). Since the substance is more concentrated in the cell (high) than surroundings (low), to move it into the cell (against gradient), active transport (A) is needed.

Answer:

A. active transport