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Describe what is meant by the 'lock and key' theory.

When binding two things together in biology, such as an enzyme and a substrate, in order to fit together they musth ave a specific shape. The shape of the enzyme active site must be the reciprocal to the sha...
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Answered by Lily W. • Biology tutor
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What is the equation for respiration?

C6H12O6 + 6O2 -----6CO 2 + 6H 2 O
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Answered by Lily W. • Biology tutor
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Explain how ciliary muscles and elastic fibres change the shape of lens to a distant object

if you are looking at a far away object, your eyes don’t need to refract the light too much in order to focus it onto the retina. So in this case the lens shape should be flat instead of fat. And how this ha...
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Answered by Ryan R. • Biology tutor
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You and your lab partner have isolated a strand of DNA which you wish to amplify. You decide to carry out a polymerase chain reaction. Describe the 3 main temperature changes that occur and what key events happen at these stages.

The polymerase chain reaction (PCR) involves many cycles of heating and cooling in order to amplify a section of DNA. You initially heat the DNA to 92 C : this denatures you double-stranded DNA so that you h...
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Answered by Amy A. • Biology tutor
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Describe the steps of mitosis

Mitosis is one of the two types of cell division which leads to the production of two genetically identical diploid daughter cells (2n) from one original diploid parent cell (2n). The steps of mitosis are (i...
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Answered by Luke R. • Biology tutor
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