WebFeb 16, 2024 · Concentration: Diffusion of molecules is entirely dependent on moving from an area of higher concentration to an area of lower concentration. In other words, diffusion occurs down the concentration … WebFacilitated diffusion across a membrane requires _____ and moves a solute _____ its concentration gradient. a. transport proteins . . . up (against) b. transport proteins . . . down c. energy and transport proteins . . . up d. energy and transport proteins . . . down ... then use the up and down arrows to select an option from the list. Create ...

Diffusion Across Membranes Ask A Biologist

WebIn facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers. A concentration gradient exists for these molecules, so they have the potential to diffuse into (or out of) the cell by moving … Here, the cell can't import glucose for free using diffusion, because the natural … can alexa read books

Cells and movement across membranes - BBC Bitesize

WebDiffusion is the movement of molecules across the membrane down their concentration gradient and the process continues until there are equal concentrations on both sides of … WebIn simple diffusion, molecules move down the concentration gradient but in facilitated diffusion molecules move up the concentration gradient. Simple diffusion is passive but facilitated diffusion is an active process that uses energy. WebFacilitated transport. In facilitated transport, also called facilitated diffusion, material moves across the plasma membrane with the assistance of transmembrane proteins down a concentration gradient (from high to low concentration) without the expenditure of cellular energy. However, the substances that undergo facilitated transport would otherwise not … can alexa read books from scribd