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-Primary structure is the number and sequence of amino acids in a polypeptide.-The secondary structure of a polypeptide is the formation of alpha helices and beta- pleated sheets stabilised by hydrogen bo...

You may remember that there are broad categories of microorganisms that cause diseases, such as bacteria, viruses and fungi which all have different properties and ways of causing disease. Antibiotics are...

The easiest way to remember the main different between xylem and phloem, when you know one transports glucose and the other water and minerals, is that phloem (pronounced as an 'f') = food, so glucose. An...

part of the DNA molecule unwinds DNA strands separate by DNA helicase breaking the hydrogen bonds one strand used as the template strand free nucleotides line up against DNA and bind through complementary...

Receptors in the skin detect a stimulus (which is a change in environment, for example an increase in temperature when you touch a hot pan). Sensory neurones (a nerve cell which sends electrical impulses ...