Why do epithelial cells in the human small intestine use active transport to absorb glucose?
Glucose is dissolved in the liquid inside the digestive tract.
Glucose is needed by the body in very low concentrations.
Glucose is present at a higher concentration in the intestinal lumen than inside the cells.
Glucose is present at a lower concentration in the intestinal lumen than inside the cells.
82 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.