This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemistry of Carbohydrates, Amino sugars, and Mucopolysaccharides, Subject name: Biochemistry
Lactose on hydrolysis yeilds - 
Select and explain. 
A. 2 molecules of fructose, B. 2 molecules of glucose, C. One molecule of glocuse and one molecule of fructose, D. One molecule of glocuse and one molecule of galactose
D: One molecule of glocuse and one molecule of galactose
Answer: D: One molecule of glocuse and one molecule of galactose 
Explanation: Ans. is 'd' i.e.. One molecule of glocuse and one molecule of galactoseo Sucrose is hydrolysed into fructose and glucose by sucrase (an enzyme present in brush border of intestinal epithelium).o Lactose is hydrolysed into galactose and glucose by lactase (p-giucosidase).o Trehalase hydrolyzes trehelose (a 1:1 a - linked dimer of glucose) into two glucose molecules,o Trehalose is found in mushrooms.o Maltasc hydrolyses moltose and maltotriose and releases two molecules of glucose from maltose and three molecules of glucose from maltotriose.