The process by which molecules such as glucose are moved into cells along their concentration gradient with the help of membrane-bound carrier proteins is called:Question 17Select one:a.osmosis.b.facilitated diffusion.c.active transport.d.endocytosis.e.exocytosis.

The movement of substances from lower to higher concentration across a semi-permeable membrane that must have a specific protein carrier and use energy is called: A. facilitated diffusion. B. diffusion. C. active transport. D. osmosis. E. endocytosis.

How do molecules move that are facilitated by active transport?lower concentration to higher concentrationthrough the cell membranehigher concentration to lower concentration

A process that requires cellular energy to move a substance against its concentration gradient is called:Question 16Select one:a.active transport.b.passive transportc.facilitated transport.d.osmosis.e.diffusion.

Carrier-mediated transport of a substance down its concentration gradient is called _______________.endocytosisactive transportfacilitated diffusionexocytosis

17. Transmembrane proteins are involved in the transport of sugars across the plasma membrane.Glucose can be moved into cells by facilitated diffusion using proteins called GLUT proteins. Theseproteins expose a single binding site on one side of the membrane. Glucose binds to this site and causesa change in the shape of the protein. This change moves the glucose across the membrane and releasesit on the other side.i. Explain why facilitated diffusion via GLUT proteins requires no metabolic energy.