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A mutation is a change in the sequence of nucleotides that make up DNA. This can be caused by a range of internal and external factors. Mutations within the coding region of genes can lead to changes i...

Nephrons are units of the kidney which are specially adapted for filtration and reabsorption of substances in the blood. Each nephron is composed of different various parts which have specific roles. T...

Antiobiotics kill bacteria but bacteria can become resistant to antibiotics. This happens through a process called natural selection. Within a group/population of bacteria they will all have small diff...

Cell wall

Examples

1. Epithelial cells clear airways and have cilia which beat back and forth to move bacteria.

2. Red blood cells carry oxygen and have no nucleus so they have a larg...