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Despite the fact that the stomata open in response to light, they may close on a hot day in order to conserve water. This is because the heat may cause the water to evaporate out through the stomata, caus...

Pathogens are microorganisms that cause disease. They may be bacteria, viruses, protists or funghi. They can infect animals and plants, causing a wide range of diseases. 

Pathogens, such as bacteri...

The CNS (Central Nervous System) consists of the brain and the spinal cord. Neurones, found in the nervous system, are nerve cells that carry information in the form of electrical signals/impulses. There ...

 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 ...