Question

5. Which of the following is an example of active transport?

Answer 1

Answer:

D (proteins moving ions from low to high concentration across a cell membrane)

Explanation:

Active transport, by definition, is a type of substance transport that requires energy (typically in the form of ATP). Having said that, we can immediately eliminate B (aka water diffusion throughout the cytoplasm of a cell), as diffusion (osmosis in this case) does not require any expenditure/spending of energy. Next, we can cancel A and C because although they do require energy, there is no transport involved. Thus that leaves us with D. D is not only the answer because of the process of elimination but also b/c the ans. choice says that ions are being moved from low to high concentration, which is against the concentration gradient and thus requires energy. Hope you found this helpful! :)

Answer 2

Answer:

Which of the following is an example of active transport?

Cilia moving rapidly to propel a single-celled organism through water  proteins moving ions from low to high concentration across a cell membrane

Explanation:

Active transport involves movement of ions from a region of low concentration across a cell membrane to a region of high concentration