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An enzyme is a biological catalyst. It is a protein with an active site that binds to a substrate to accelerate a chemical reaction.

Plants have photoreceptors in the tips of their shoots. If light is detected from a specific direction, the plant will produce auxins which diffuse fown the shoot of the plant. The auxins increase in conc...

Resperation in cells occurs in the Mitochondria. Mitochondria are rod shaped organelles that can be thought of as the power generators of the cell. There role is to convert Oxygen and Nutrients into Adeno...

A chromosome is a long, tightly coiled molecule of DNA. Chromosomes are split into sections called genes. In the human body there are 48 chromosomes within each cell (except sex cells which have 23). Chro...

Xylem and phloem are a little bit like the blood vessels we have in our body and make up what is called 'vascular bundles' in plants. Xylem are essential for providing water to the plant by transpiration ...