The following mechanism accounts for transport of glucose from the intestinal lumen into an intestinal epithelial cell:Select one:a. Facilitated diffusionb. Co-transportc. Simple diffusiond. Counter-transporte. Primary active transport

The correct answer is b. Co-transport.

Here's a step-by-step explanation:

1. Glucose is transported from the intestinal lumen into the intestinal epithelial cell via a process called co-transport, or secondary active transport.

2. This process involves a protein in the cell membrane called a symporter.

3. The symporter transports glucose along with sodium ions (Na+) into the cell.

4. The movement of sodium ions down their concentration gradient provides the energy for the transport of glucose against its concentration gradient (from lower to higher concentration).

5. This process is called co-transport because two substances are transported across the membrane at the same time.

6. It's important to note that this process is different from simple diffusion (where substances move from an area of higher concentration to an area of lower concentration without the need for energy), facilitated diffusion (which also doesn't require energy but needs a carrier protein to facilitate the transport), counter-transport (where two substances are transported in opposite directions), and primary active transport (which directly uses energy to transport substances against their concentration gradient).