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What is the Electron Transport Chain (ETC)?

The electron transport chain is a process that occurs in the inner membrane of mitochondria. It involves the transport of electrons through 4 complexes in the membrane, which provides energy for the transfer...
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Answered by Adam J. • Biology tutor
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Describe the process of natural selection

There is genetic diversity within the population. Random mutation can occur, forming new alleles of a gene. Though many mutations are harmful, in certain environments the new allele may benefit its possessor...
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Answered by Jewel J. • Biology tutor
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Explain the roles of ATP and calcium ions in muscle contraction. (4 marks)

The hydrolysis of ATP provides the energy necessary to break the cross-bridges formed between actin and myosin heads. The hydrolysis of ATP is also used to provide the energy for the power stroke, which is w...
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Answered by Rachel H. • Biology tutor
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What is ATP and why do we need it?

ATP is short for adenosine triphosphate, and it can be thought of as the energy 'currency' in our cells. It has a similar structure to that of an RNA nucleotide, as it is comprised of a nitrogenous base (ade...
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I feel like I understand the concept, why I am I still not getting full marks on the question?

Understanding concepts in exams is only part of the battle. To improve your marks you need to improve your exam technique! For example: Have you correctly interpreted what the question is asking of you? Is y...
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Answered by Tom R. • Biology tutor
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