( ii ) hexoses are taken up by two systems , a glucose-specific system with a k m of 45 mum and a high v max for glucose and a k m of 6 mm and a low v max for fructose , and a fructosespecific system with a k m of 500 mum and high a v max for fructose and a k m of 650 mum and a low v max for glucose .
C0019494
hexoses
C0016745
fructose