Question

sugars are large hydrophilic molecules that are important energy sources for cells. sugars can enter cells from an environment with a very high concentration of sugar by ______.
using ribosomes
active transport
facilitated diffusion
simple diffusion
osmosis

Explanation:

Sugars are large hydrophilic molecules; they cannot pass through the lipid bilayer via simple diffusion. Facilitated diffusion uses transport proteins to move large/polar molecules down their concentration gradient (from high to low concentration), which matches the scenario of sugar entering from a high-concentration environment. Ribosomes synthesize proteins (not transport), active transport requires energy for against-gradient movement, simple diffusion is for small nonpolar molecules, and osmosis is for water movement. Thus, facilitated diffusion is correct.

Answer:

C. facilitated diffusion