Which structure controls the movement of substances into and out of the cell?

Which structure controls the movement of substances into and out of the cell?

• A. Cell Membrane
• B. Nucleus
• C. Ribosome
• D. Golgi Apparatus

Answer: (A)

Movement of substances into and out of the cell is controlled by the cell membrane. This boundary is selectively permeable and uses channels, transport proteins, and pumps to let nutrients in, wastes out, and to maintain the internal environment of the cell. It enables different forms of transport, from simple diffusion and osmosis to active transport that requires energy, helping the cell stay balanced and responsive to its surroundings. The nucleus governs genetic information and cell activities but does not regulate traffic across the membrane. Ribosomes build proteins, and the Golgi apparatus processes and ships those molecules, but neither directly controls what crosses the cell boundary. So, the cell membrane is the structure that governs movement across the cell.

Movement of substances into and out of the cell is controlled by the cell membrane. This boundary is selectively permeable and uses channels, transport proteins, and pumps to let nutrients in, wastes out, and to maintain the internal environment of the cell. It enables different forms of transport, from simple diffusion and osmosis to active transport that requires energy, helping the cell stay balanced and responsive to its surroundings. The nucleus governs genetic information and cell activities but does not regulate traffic across the membrane. Ribosomes build proteins, and the Golgi apparatus processes and ships those molecules, but neither directly controls what crosses the cell boundary. So, the cell membrane is the structure that governs movement across the cell.