B2.1 Cells And Simple Cell Transport

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GCSE Biology (B2) Mind Map on B2.1 Cells And Simple Cell Transport, created by killthemoment on 08/03/2014.

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B2.1 Cells And Simple Cell Transport
1 B2.1.1 Cells And Cell Structure
1.1 All living things are made up of cells. The structures of different types of cells are related to their functions. To get into or out of cells, dissolved substances have to cross the cell membranes.
1.1.1 Most human and animal cells have the following parts: a nucleus, which controls the activities of the cell; cytoplasm, in which most of the chemical reactions take place; a cell membrane, which controls the passage of substances into and out of the cell; mitochondria, which is where most energy is released in respiration; ribosomes, which is where protein synthesis occurs. Plant and algal cells also have a cell wall made of cellulose, which strengthens the cell. Plant cells often have chloroplasts, which absorb light energy to make food and a permanent vacuole filled with cell sap. A bacterial cell consists of cytoplasm and a membrane surrounded by a cell wall; the genes are not in a distinct nucleus. Yeast is a single-celled organism. Yeast cells have a nucleus, cytoplasm and a membrane surrounded by a cell wall. Cells may be specialised to carry out a particular function.
2 B2.1.2 Dissolved Substances
2.1 Dissolved substances can move into and out of cells by diffusion.
2.1.1 Diffusion is the spreading of the particles of a gas, or of any substance in solution, resulting in a net movement from a region where they are of a higher concentration to a region with a lower concentration. The greater the difference in concentration, the faster the rate of diffusion. Oxygen required for respiration passes through cell membranes by diffusion.
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