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What are enzymes and how do they work?

Enzymes are small proteins found in living organisms. They are described as biological catalysts, meaning they speed up reactions and remain unchanged at the end, ready to do the same again. They are vital f...
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Answered by Isabel M. • Biology tutor
3612 Views

How do you show some quadratic polynomials are always greater than 0?

Usually, there are two ways to solve this kind of problems. You could re-arrange the polynomial, make it become a square plus a constant, then the polynomial is greater or equal to the constant since a squar...
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Answered by Luke W. • Maths tutor
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Why do organs need to be 'matched'?

The antigens present on the cell surface membranes of organs are different from person to person due to genetic variation (leading to protein tertiary structure variation - remember antigens are proteins and...
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Answered by Frances E. • Biology tutor
2931 Views

Differentiate the function y=4sqrt(x)

Can re-write function as y=4x 1/2 Then follow the standard steps for differentiating a power. Take the 1/2 down and multiply by the number in front of the x, in this case 4, to give 2. Now reduce the power w...
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Answered by Calum W. • Maths tutor
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What is the gradient of the curve y = 2x^3 at the point (2,2)?

Firstky differentiate to gain an equation for the gradient.Differentiating gives:dy/dx = 6x 2 Insert x = 2 into the above equation to find the gradient at that particular point of the curve.When x = 2, dy/dx...
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Answered by Emily R. • Maths tutor
8786 Views