Question

Glucose provides energy for cells. Different cells have different mechanisms for glucose intake. Intestinal cells contain proteins that transport glucose against its concentration gradient. These proteins couple the movement of glucose to the movement of sodium down its concentration gradient. Red blood cells have transporter proteins embedded in their membranes. When bound by a glucose molecule, these proteins change shape and allow glucose to move down its concentration gradient into the cell.
Based on this information, what type of transport is used for glucose in blood and intestinal cells?
A.
Both blood and intestinal cells take in glucose by active transport.
B.
Blood cells take in glucose by active transport and intestinal cells take in glucose by passive transport.
C.
Blood cells take in glucose by passive transport and intestinal cells take in glucose by active transport.
D.
Both blood and intestinal cells take in glucose by passive transport.

Answer 1

active transport in small intestines and passive transport in blood cells

Answer 2

Answer:

Option (C).

Explanation:

Plasma membrane has different transport proteins that transport large, polar and charged molecules that cannot be passed through hydrophobic membrane.

In intestinal cells, glucose is transported against its concentration gradient (from higher to lower concentration), with the help of transporters. It is known as active transport as energy is required for uphill transport (against the concentration) of glucose.

In blood cells, glucose is transported along with its concentration gradient (from higher to lower concentration) by carrier proteins. It is known as passive transport as no energy is required for the downhill (along the concentration) transport of glucose.

Thus, the correct answer is option (C).