Question

1. iodine is moved against its concentration gradient (low to high concentration) into the cells of the thyroid gland. iodine is used by the thyroid cells to produce a hormone. which of the following processes moves iodine into the thyroid cells?

a. osmosis
b. diffusion
c. cellular respiration
d. active transport

Explanation:

Active transport is the process that moves substances against their concentration gradient (from low to high concentration) using energy. Osmosis is the movement of water. Diffusion is the movement of substances down their concentration gradient (from high to low concentration). Cellular respiration is the process of generating energy in cells. Since iodine is moved against its concentration gradient, active transport is the correct process.

Answer:

D. Active Transport