4. Which process(es) use ATP in a cell? Choose all that apply. (A) active transport C facilitated diffusion (E) simple diffusion B moving organelles D osmosis (C) sodium-potassium pumn

## Step 1<br />The question asks us to identify which processes in a cell use ATP (Adenosine Triphosphate). ATP is a molecule that provides energy for many cellular processes.<br /><br />## Step 2<br />Active transport (A) is a process that uses ATP to move molecules across the cell membrane against their concentration gradient. This means that molecules are moved from an area of lower concentration to an area of higher concentration, which requires energy.<br /><br />## Step 3<br />Facilitated diffusion (C) is a passive transport process that uses transport proteins to move molecules across the cell membrane. It does not require ATP.<br /><br />## Step 4<br />Simple diffusion (E) is also a passive transport process where molecules move from an area of higher concentration to an area of lower concentration. It does not require ATP.<br /><br />## Step 5<br />Moving organelles (B) refers to the movement of organelles within the cell, such as mitochondria or chloroplasts. This movement often requires ATP.<br /><br />## Step 6<br />Osmosis (D) is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration. It does not require ATP.<br /><br />## Step 7<br />The sodium-potassium pump (C) is an example of active transport. It uses ATP to move sodium and potassium ions against their concentration gradients.