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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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A circle with centre C(2, 3) passes through the point A(-4,-5). (a) Find the equation of the circle in the form (x-a)^2 + (y-b)^2=k

This question is aimed at A-Level Pure Core 1 students. A circle with centre C(2, 3) passes through the point A(-4,-5). Find the equation of the circle in the form (x-a)^2 + (y-b)^2 = k From the formula for ...
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Answered by Tilly C. • Maths tutor
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What is meant by ‘determinism’ and what are the different types I need to know for the AQA paper 3 exam?

Determinism refers to the understanding that all human behaviour is controlled and has an identifiable cause. It is the opposite to ‘free will’ which refers to individuals having active control over their ow...
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Answered by Jodie F. • Psychology tutor
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Prove by induction the sum of the natural numbers from 1 to n is n(n+1)/2

Need whiteboard throughout to properly answer, so will go through the ideas of what to do: Take the base case of when n=1, and show that (sum from 1 to 1) j = n(n+1)/2 is equal to 1. Take the assumption that...
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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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