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How do we classify living organisms?

Traditionally we have classified living organisms into groups based on their structure and morphology (essentially how they look!). This was a system developed by a scientist called Linnaeus in the 1700's. L...
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Answered by Bryony P. • Biology tutor
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Compare the differences between prokaryotic and eukaryotic cells.

Prokaryotic and eukaryotic cells vary in may ways:Size: Prokaryotic cells are smaller than eukaryotic cells. Prokaryotic cells have a diameter of 0.1-0.5 micrometers whereas eukaryotic cells have a larger di...
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Answered by Amisha G. • Biology tutor
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What is the origin of such a wide genetic variation among offspring?

In all the species that reproduce sexually, there are three main mechanisms that contribute to genetic variation:independent assortment of chromosomes, crossing-over, and random fertilization. Independent as...
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Answered by Andrew M. • Biology tutor
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I don't understand the difference between DNA, genes and chromosomes?

In the every cell of the human body, there is a part called the nucleus - this contains all of the genetic information. In each cell nucleus there are 24 pairs of chromosomes. They come in pairs because we g...
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Answered by Hannah I. • Biology tutor
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Different enzymes catalyse specific reactions. Explain why enzymes can only catalyse specific reactions.

A simple way of thinking about why enzymes catalyse only specific reactions is to think of the enzyme and the substrate (the compound the enzyme is acting upon) as a lock and key system. Enzymes have a parti...
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Answered by Oliver D. • Biology tutor
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