Correct option is A
Correct Answer: c) Fructose
Explanation:
GLUT5 is a facilitated diffusion transporter specifically responsible for the uptake of fructose from the intestinal lumen into enterocytes (intestinal absorptive cells).
It operates independently of sodium ions (Na⁺) and allows fructose to move along its concentration gradient.
Information Booster:
Glucose and galactose are transported via the SGLT1 (sodium-glucose linked transporter 1) using secondary active transport (Na⁺ dependent).
Once inside the enterocyte, all monosaccharides (glucose, galactose, fructose) exit into the bloodstream through the GLUT2 transporter located on the basolateral membrane.
Lactose, being a disaccharide, is not directly transported; it must first be hydrolyzed by lactase enzyme into glucose and galactose before absorption.
Additional Knowledge (Incorrect Options Explained):
a) Glucose: Transported by SGLT1, not GLUT5.
b) Galactose: Also transported by SGLT1, not GLUT5.
d) Lactose: Too large for transport; must be digested first.
