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This is called active transport, and takes place through carrier proteins in the membrane. • Substances can be moved in bulk across a membrane by exocytosis or endocytosis. increase in temperature increases the movement of the molecules in a membrane, increasing the • An membrane’s permeability. 34 Chapter 2: Cell membranes Questions Red blood cells destroyed by haemolysis / % 1 a Red blood cells of mammals respond to changes in the concentration of salts in Hint the fluid that surrounds them. If they are placed in a solution that has a lower concentration of salts than blood plasma, they swell and may burst.
The single-celled fungus, Saccharomyces cerevisiae, yeast, reproduces by budding. 11). Your body contains about 1013 cells. They have all developed from the single cell with which you began your life – the zygote that was formed by the fusion of an egg cell and a sperm cell. The zygote divided to form a tiny ball of cells called a blastocyst, which continued to divide to form an embryo. In multicellular organisms, there are usually many different kinds of cells. These cells have become specialised to carry out different functions.
The cell is plasmolysed. External solution now fills the gap between wall and plasma membrane. Some parts of the membrane are resistant to pulling away from the wall. If the membrane is torn at these points, the cell dies. 9 Osmosis and plant cells. 31 Chapter 2: Cell membranes Water moves into or out of the cell, down its water potential gradient, just as in an animal cell. The cell wall does not directly affect this movement, because it is fully permeable to water and to most of the solutes dissolved in it.