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Emphysema is a disease of the lungs. Explain why people suffering from this condition may feel weak and short of breath.(6 marks)

Emphysema is an obstructive lung disease(1), where alveoli collapse due to break down of elastin in their walls(2). This means that the lungs cannot recoil(3), making expiration difficult. There is less s...

Answered by Sara I. • Biology tutor

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The line l is a tangent to the circle x^2 + y^2 = 40 at the point A. A is the point (2,6). The line l crosses the x-axis at the point P. Work out the area of the triangle OAP.

Firstly to work out the area of the triangle OAP we need to know the coordinates of the individual points O, A and P. O is the centre of the axis hence has coordinates (0,0). The coordinates of the point ...

Answered by Mohammad Q. • Maths tutor

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Succinate is converted to fumarate by the enzyme dehydrogenase. This reaction can be inhibited by adding malonate. a) What are enzymes and what are their function? Use this information to explain how malonate acts as an inhibitor.

a) What are enzymes and what are their function? Use this information to explain how malonate acts as an inhibitor.

What are enzymes? Enzymes are proteins that act as catalysts in living cel...

Answered by Laura S. • Biology tutor

4834 Views

Solve the simultaneous equations: 2x-y=x+4; x^2+4y^2=37

taking equation 1 and solving for x: 2x-y=x+4 x-y=4 x=y+4 Sub our new equation into equation 2 from the question: (y+4)²+4y²=37 Expand and simplify: y²+8y+16+4y²

Answered by Alexander W. • Maths tutor

5157 Views

How can I write a good essay?

In order to write a good, accurate and developped essay in French you first need to begin by fully understanding the question. A lot of people tend to skim read the question, getting a gist of what it is ...

Answered by William J. • French tutor

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