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What is a virus?

Viruses are some of the smallest known organisms, and can cause serious disease in humans.A virus consists of a fragment of genetic material inside a protective protein coat. For a virus to survive and repli...
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Answered by Hannah C. • Biology tutor
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How does anti-biotic resistance occur?

Anti-biotic resistance is a growing problem for humans now, exacerbated by the overuse and over reliance on anti-biotics. Bacteria colonies have genetic variation amongst the individuals which means they rea...
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Explain how a nervous impulse is transmitted across a synapse?

A synapse is the fluid filled gap between the presynaptic neuron and postsynaptic neuron. 1) An electrical impulse travels along an axon of the presynaptic neuron. 2) When the impulse reaches the nerve-endin...
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Answered by Alishba K. • Biology tutor
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Explain what is meant by the term osmosis?

Osmosis is the net movement of free water molecules from an area of high concentration to low concentration across a selectively permeable membrane.
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Answered by Oscar S. • Biology tutor
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Name the three components that make up a nucleotide

First of all a nucelotide is the monomer that makes up DNA. Millions of monomers are joined together to form the double helix of a DNA molecule. A nucleotide is made of a pentose sugar (in the case of DNA th...
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Answered by Amy S. • Biology tutor
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