Question

Glucose is a large molecule that cannot penetrate the phospholipids baitlayer of cells. Instead, glucose enters most cells, such as red blood cells, through special carrier proteins embedded in the surface of the plasma membrane. In doing so, glucose moves from an area of high concentration to an area of low concentration.

Which of these terms best describes the uptake of glucose by red blood cells based on the information?
A. facilitated diffusion
B. active transport
C. glycolysis
D. osmosis

Answer 1

The answer is A. facilitated diffusion.

When there is a net movement of particles from the area of higher concentration to the area of lower concentration of the particles in order to equalise the concentrations of the particles in both areas, this is called osmosis.
But, when the movement includes some help like some transporters or special carrier proteins, then it is called facilitated diffusion. It is facilitated by using those carrier proteins.
When the movements occur from the area of lower to the area of higher concentration of particles, then energy (ATP) is necessary to help movement against the gradient of concentration.

Glycolysis has nothing with transport, it is the breakdown of glucose using enzymes.