Question

Movement and accumulation of ions across a membrane against their concentration gradient can be explained by

• A. Facilitated Diffusion
• B. Passive Transport
• C. Active Transport
• D. Osmosis

Answer 1

The Correct Option is C

The movement and accumulation of ions across a membrane against their concentration gradient is described by a process known as active transport. Unlike passive transport mechanisms such as facilitated diffusion and osmosis, which rely on the natural kinetic energy of molecules moving down their concentration gradient, active transport requires energy input. This energy is typically provided by ATP (adenosine triphosphate). The process allows cells to maintain concentration differences across membranes, essential for various physiological functions. In summary, active transport is crucial for the uptake of ions and molecules regardless of external concentrations.

Answer 2

Active transport is a cellular process that requires energy (usually in the form of ATP) to move ions or molecules against their concentration gradient, from a region of lower concentration to a region of higher concentration. This process allows cells to maintain specific ion concentrations inside and outside the cell, which is essential for various cellular functions.

Therefore, The correct option is (C): Active Transport