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How do bacteria develop resistance to antibiotics?

When bacteria divide, random mutations in their DNA lead to differences in bacteria. Some of the bacteria will randomly develop genes that help them to survive a dose of anitbiotics (resistance). When a pers...
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Answered by Jonathan C. • Biology tutor
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What conditions are needed for evolution by natural selection to arise?

Evolution by natural selection arises when these three properties are present in a system Heredity - offspring resemble their parents in discrete characteristics. Variation - there are heritable differences ...
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Answered by Richard A. • Biology tutor
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What is the difference between Mitosis and Meiosis?

A cell has DNA and this makes up chromosomes, this is found in the nucleus of the cell. A chromosome cnan divide and form 2 chromatids. Mitosis and Meiosis are both ways in which cells reproduce. Mitosis is ...
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Answered by Simran H. • Biology tutor
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How does the World Trade Organisation (WTO) benefit developing countries?

The World Trade Organisation's purpose is to promote the free trade of goods and services amongst its 164 member states by discouraging protectionist measures and settling trade disputes. This directly benef...
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Answered by Luke H. • Economics tutor
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Explain the reflex arc using an example in humans

The reflex arc describes a sequence of events leading to an action that takes place rapidly in response to a stimulus without having to think about it i.e. without an impulse travelling to the brain for coor...
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Answered by Shayaan A. • Biology tutor
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