A-level BIOLOGY Paper 1
Figure 1 shows a cell from the lining of the ileum specialised for absorption of products of digestion. SGLT1 is a carrier protein found in the cell-surface membrane of this cell, it transports glucose and sodium ions (Na + ) into the cell. Figure 1 . The action of the carrier protein X in Figure 1 is linked to a membrane-bound ATP hydrolase enzyme. Explain the function of this ATP hydrolase. [2 marks] . The movement of Na + out of the cell allows the absorption of glucose into the cell lining the ileum. Explain how. [2 marks] 0 1 0 1 Downloaded by: ibrahim03naqvi | Distribution of this document is illegal S - The Marketplace for Revision Notes & Study Guides 3 Do not write outside the box *03* IB/M/Jun20/7402/1 0 1 . 3 Describe and explain two features you would expect to find in a cell specialised for absorption. ..
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