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A placebo is a control method to account for perceived effects of taking a medication. This is because patients often report that they feel a difference from taking a medication, irrespective of whether i...

Semi-permeable membranes in the cell will let some molecules through but not others. There are three main ways in which these molecules can move. 1) Active transportAs the name suggests, here, molecules a...

When a phagocyte recognises the antigens on a pathogen, it engulfs the pathogen. The pathogen becomes contained in a phagocytic vacuole. A lysosome fuses with the phagocytic vacuole and digestive enzymes ...

Linked genes are genes found on the same chromosome. Chromosomes are distinct 'sections' of DNA, and each gene in an organism has its own place on a chromosome. When genes are linked, it means that allele...

Schwann cells are found wrapped along the axons of some of the neurones of the peripheral nervous system (PNS).They secrete a lipid-based substance known...