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Why does the haemoglobin dissociation curve shift to the right when an individual exercises.

The concentration of carbon dioxide in a persons bloodstream rises during exercise. The carbon dioxide molecules interact with substances in the bloodstream to form carbonic acid. This causes the blood to be...
Answered by • Biology tutor
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Calculate the concentration of the water in this glass.

This is quite a classic chemistry interview question for oxbridge and one that helped me understand a little bit better about how the interviewers want you to think in the exam. They will often ask something...
JE
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Describe the structure of an antibody and relate it to it's function.

An antibody is a Y shaped protein which has a constant region and a variable region . The variable region of an antibody is of a complementary shape to a specific pathogenic antigen and this allows the antib...
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Answered by Laila R. • Biology tutor
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Solve the quadratic equation (x^2)-x-12=0 (easy), (x^2)-9=0 (special case), (x^2)+5x-13=0 (quadratic formula)

For each of the above the methodology is fairly similar, first try and do it just by looking at it then try the quadratic formula if that doesn't work. At GCSE level I don't think there's any need to worry a...
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Answered by Jack E. • Maths tutor
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1. Parabens are esters of 4-hydroxybenzoic acid (*structure*), give example of a paraben & draw other compound used to make it. 2. Suggest a possible use for parabens. 3. What type of hybridisation does the aromatic carbon adopt? 4. How do pi bonds form?

Eg. methyl/ethyl/propyl (etc.) paraben. Drawing of the alcohol used to make paraben. Possible uses: food preservative, cosmetic, or pharmaceutical use. The aromatic carbon atoms are sp 2 hybridised. p orbita...
Answered by • Chemistry tutor
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