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An enzyme is a catalyst which speeds up a reaction by providing an alternative pathway with lower activation energy required. 

Mitochondria and ribosomes are both structures inside the animal cell. Mitochondria are the site of respiration. They supply energy to the cell by aerobic respiration. Ribosomes are strucutres where prote...

1- The drug has a similar shape to the substrate which is complementary to the active site of the electron transport chain proteins. 2- Competitive inhibition stops the transfer of electrons, coming from ...

The heart follows a cycle of contraction (systole) and relaxation (diastole), like this:

whole heart diastole --> atria systole --> ventricular systole --> atria diastole, ventricular syst...

There are 3 hormones mentioned in the AQA GCSE Biology specification. These are FSH (follicle stimulating hormone), LH (leuteinising hormone), and oestrogen. FSH and LH are produced by the pituitary gland...