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Parasitic organisms (or parasites) refer to living things which sustain themselves, obtaining nutrients and other resources, at the expense of another organism that they live on or within, known as the ho...

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...