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Explain what an 'enzyme' is.

An enzyme is a catalyst which speeds up a reaction by providing an alternative pathway with lower activation energy required.
YC
Answered by Yuko C. • Biology tutor
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What are mitochondria and ribosomes and what are their function?

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 protein ...
RL
Answered by Rebekah L. • Biology tutor
17265 Views

A drug used in a scientific trial is a competitive inhibitor of the elctron transport chain in the light dependent reaction, what affect will this have on the amount of glucose synthesised by the plant? (4 marks)

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...
SP
Answered by Sam P. • Biology tutor
3065 Views

How does the sequence of pressure changes in the heart produce a unidirectional flow of blood?

The heart follows a cycle of contraction (systole) and relaxation (diastole), like this: whole heart diastole --> atria systole --> ventricular systole --> atria diastole, ventricular systole -->...
MW
Answered by Maria W. • Biology tutor
4851 Views

How do hormones affect the menstrual cycle?

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 in...
VM
Answered by Vanisha M. • Biology tutor
4268 Views