Q. Some cells are placed in a solution of glucose to measure the rate of diffusion. As the concentration of glucose solution is being increased, the diffusion rate increases simultaneously. However, when the concentration of glucose solution reaches above 10 m, the diffusion rate no longer increases Which statement best define the mechanism of glucoses transport in the cells?
A) Transport of hydrophilic substances along the concentration gradient through fixed membrane transport protein without the involvement of energy expenditure
B) Transport of hydrophilic substances along and against the concentration gradient via carrier proteins
C) Active transport via transporter proteins
D) Facilitated diffusion without carrier proteins
Explanation
Diffusion is process in which uncharged molecules pass easily through a biological membrane. However, water soluble substance face difficulty to cross the membrane and the transport of these hydrophilic molecules are facilitated by carrier proteins, which are possessed by cell membrane. The overall process do not require energy and is referred to as facilitated diffusion
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.