Cells from the lining of the small intestine are grown in a laboratory. Some of the cells are accidentally placed in pure water. The cells swell and some of their cell membranes split.
Explain why some of the cell membranes split.
A different batch of cells is placed in a solution that initially has the same water potential as the cytoplasm. Carrier proteins then use active transport to move mineral ions out of the cells into the surrounding solution, where these ions are already more concentrated.
Suggest why the cells shrink.
194 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.