Question

Substances that are going to move against their concentration gradient (from low concentration to high concentration) will use which type(s) of membrane transport?

Answer 1

Answer;

-Active transport

Explanation;

-Active transport involves movement of substances against a concentration gradient. To move substances against a concentration or electrochemical gradient, a cell must use energy.

-Dissolved molecules move across a cell membrane from a lower to a higher concentration. In active transport, particles move against the concentration gradient and therefore require an input of energy from the cell.

-Additionally, active transport require carrier proteins (solute pumps). Protein carriers bind specifically and reversibly with substance being moved . Some carriers transport more than one substance. Antiporters transport one substance into cell while transporting a different substance out of cell, while symporters transport two different substances in the same direction.

Answer 2

The correct answer is active transport.

For this kind of transport the cell requires energy, usually in the form of ATP, to move a molecule against its concentration gradient.

There are two types of active transport:

Primary active transport which directly uses a source of chemical energy to move molecules. Example: sodium-potassium pump

Secondary active transport (cotransport), which uses an electrochemical gradient (generated by active transport)as an energy source to move molecules. Example: glucose symporter SGLT1