Question

In kidney cells, charged ions like sodium and chloride are reabsorbed from the urine against a concentration gradient. Which mode of cellular transport is employed here?

Select one of the options below as your answer:

A. Facilitated diffusion
B. Simple diffusion
C. Osmosis
D. Active transport

Answer 1

The correct answer is D. Active transport

Active transport in the cells is a process of absorption of atoms or molecules against the concentration gradient. In order to do this, cells need to produce special kinds of transporters, called molecular pumps that facilitate the absorption of the atoms/molecules. During active transport the pumps spend energy gotten from the molecule of ATP.

In contrast, during the process of osmosis the molecules/atoms move with the concentration gradient and require no energy to do so.

Answer 2

"Active transport" is the one mode of cellular transport among the choices given in the question that is employed here. The correct option among all the options that are given in the question is the fourth option or option "D". I hope that the answer has helped actually come to your help.