PENICILLIN is rapidly eliminated from the human body, and 40–99 per cent of an injected dose can be recovered from the urine within four hours in normal cases. There is some evidence that the drug is ...

Here you can find CCEA past papers for GCSE Biology (Single Science). Use the links below to download question papers and mark schemes (which contain the answers). If you’re unsure whether you need ...

Cell biology is the discipline of biological sciences that studies the structure, physiology, growth, reproduction and death of cells. Research in cell biology uses microscopic and molecular tools and ...

Part of Biology (Single Science) Health, disease and the development of medicines Antibiotics damage the bacterial cells by inhibiting their cellular processes, but do not damage the host cells. They ...

From running up stairs, to rigorous gardening: these everyday activities could boost your health and help you live longer. Brown fat burns energy when we are cold. Now scientists are trying to harness ...