Which organelle is specifically involved in the movement of molecules in and out of cells

I believe the answer is Plasma Membrane.

Explanation:

The plasma membrane also plays a vital role in regulating the movement of substances in and out of the cell.

Hope this helps! ^^

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.