Question

You place cells in a solution of glucose and measure the rate at which glucose enters the cells ad u increase the concentration of glucose solution ,the rate at which glucose enters the cell increase .however ,when the glucose concentration of the solution is increase above 10M ,the rate at which glucose enters no longer increase .which of the following is the most likelymechanism for glucose transport in the cell?

Answer 1

Active transport.
Because after that it will not diffuse so energy is required to transport glucose into the solution.

Answer 2

Concept introduction:

The movement of glucose through cell membranes is mediated by two different processes. A secondary active transport mechanism in which glucose is co transported with sodium ions moves glucose against a concentration gradient in the colon and renal proximal tubule.

Explanation:

Given that, rate increases as we increase glucose concentration to certain level.

We have to find, why rate dose not change even after changing the concentration of glucose.

According to the question,

Molecules travel from higher concentration to lower through semi permeable membrane. But glucose transportation occurs against the concentration gradient. Till $10$M the solution across the membrane come to equilibrium. Hence after increasing glucose concentration above $10$M the rate at which glucose enters no longer increase because the concentration comes at equilibrium.

Final Answer:

After increasing glucose concentration above $10$M the rate at which glucose enters no longer increase because the concentration comes at equilibrium.

SPJ3