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1 a) a microorganism that causes infectious disease

1 b) White blood cells:

- Ingest pathogens

- produce antibodies which destroy particular bacteria or viruses

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All the cells in our body communicate constantly with their surrounding environment in order to feed and excrete their wastes. Various substances in that environment pass through the cell membrane to ente...

The plasma membrane is organised into what is referred to as a lipid bilayer, consisting primarily of phospholipids and proteins. Phospholipids contain a hydrophobic (water hating) fatty acid 'tail' and a...

Bacterial resistance to antibiotics is an example of natural selection. In a population of bacteria there may be some individuals that are not affected by the antibiotic. This may be due to random changes...

Meiosis - cell division to form gametes (sex cells), each gamete contains half the number of chromosomes than in a normal cell. Mitosis - division of body cells during normal growth, each cell contains a ...