HUMAN NUTRITION

Detailed explanation-1: -The monosaccharide units, glucose, galactose and fructose are transported through the wall of the small intestine and then into the portal vein which then takes these elements straight to the liver.

Detailed explanation-2: -Monosaccharide sugars such as galactose, glucose, and fructose are absorbed by active transport across the microvillus membrane of the small intestine into the portal blood system for transport to the liver. Rates of absorption differ between sugars and they mutually interfere with each other’s absorption.

Detailed explanation-3: -The absorption of carbohydrates in the blood the most rapidly transported monosaccharide is galactose. Thus, the correct option is ‘D’. Galactose.

Detailed explanation-4: -Particularly important dietary carbohydrates include starch and disaccharides such as lactose and sucrose. None of these molecules can be absorbed for the simple reason that they cannot cross cell membranes unaided and, unlike the situation for monosaccharides, there are no transporters to carry them across.