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What is the importance of the 'refractory period' after an action potential has been generated?

The refractory period is a period of recovery after an action potential where the ion channels will not open and the membrane can't be excited or depolarised. This happens to encourage the diffusion of sodiu...
Answered by • Biology tutor
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A rectangle has an area of 20 cm2. Its length and width are enlarged by scale factor 3. Find the area of the enlarged rectangle.

Area of rectangle is 20 cm 2 . The new area of the enlarged rectangle is the original area, 20 cm 2 , times the area scale factor. We are only given the length scale factor, therefore, we need to work out th...
PB
Answered by Paulina B. • Maths tutor
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∫ 4/x^2+ 5x − 14 dx

For this problem we want to look to split it into logical steps We first identify that it is an integration problem without limits therefore there will be a constant of integration +C present The denominator...
KK
Answered by Kostas K. • Maths tutor
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Two proteins have the same number and type of amino acids but different tertiary structures. Explain why.

The order of the amino acids (primary structure) in the two proteins may be different. This can result in ionic, hydrogen and disulphide bonds to form in different locations in each protein. Such differences...
ES
Answered by Etienne S. • Biology tutor
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Find the turning points on the curve with the equation y=x^4-12x^2

y = x^4 - 12x^2 dy/dx = 4x^3 - 24x The turning points are where dy/dx = 0 4x^3 - 24x =0 x(4x^2 - 24) = 0 Therefore one of the turning points is at x = 0 4x^2 - 24 = 0 4x^2 = 24 x^2 = 6 x = +/- √6 Substitute ...
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