This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
Transpo of glucose from the lumen to the mucosal cell is dependent on the diffusion of 
Select and explain. 
A. K+, B. HCO3, C. Na+, D. Proteins
C: Na+
Answer: C: Na+ 
Explanation: Glucose and galactose are absorbed by a sodium-dependent process. They are carried by the same transpo protein (SGLT 1)The SGLT 1 transpoer is coupled to the Na+-K+ pump, allowing glucose and galactose to be transpoed against their concentration gradients.Harper 30th edition Pg:538