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 The key is the enzyme and substrate is the lock. Like a key only unlocks one lock, the active site on the enzyme only fits in 1 type of substrate. Extreme temperature or pH (how acidic something is) dena...

Alleles are different versions of a gene. A gene is the piece of DNA which carries information in the form of a sequence of amino acids. For every gene that we have, we carry 2 alleles which could be the ...

First of all, the stimulus (a change in environment) will cause the receptor in the skin to fire an action potential down the sensory neurone. The sensory neurone then reaches the relay neurone in the CNS...

The growth and roots and shoots is caused by the plant hormone auxin. Shoots grow towards light, known as phototropism, they also grow upwards against the force of gravity which is known as geotropism. In...

mitosis is the process by which one cell can divide to generate two genetically identical daughter cells. It allows a population of cells to increase in numbers.

In mitosis the cell initially creat...