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Describe the process of oxygen transport via haemoglobin.

Haemoglobin is a complex metal ion consisting of hexa-coordinated Fe 2+ ions. With 6 coordinate bonds, haemoglobin forms an octahedral shape where 4 nitrogen ligands form a haem disc, a globin molecule forms...
Answered by • Chemistry tutor
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What is the difference of SN1 and an SN2 mechanism?

SN1= only 1 species involved in the rate determining step = carbocation intermediate = racemic mixture = not optically active SN2= 2 species involved in the rate determining step =transition state = single o...
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Answered by Hannah S. • Chemistry tutor
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How is an oxbow lake formed?

The outside of a bend has faster flow, which means that erosion occurs there. Over time, this means that the neck of the meander, which is the gap between 2 parallel channels in the meander, gets narrower. W...
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Answered by William S. • Geography tutor
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What is the structure of DNA?

DNA stands for deoxyribonucleic acid. And what is DNA? Well, it’s basically a carrier of genetic information. DNA is found in all cells, and it contains the information needed for cells to live, to grow and ...
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Answered by Molly S. • Biology tutor
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What is an enzyme? and why are they so important for reactions to take place?

An enzyme is a type of protein which we call a biological catalyst. In biology, a catalyst is a chemical which helps speed up reactions without being used up itself. Therefore, if you add 2ml of an enzyme to...
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Answered by Laura P. • Biology tutor
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