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Explain the lock and key hypothesis of chemical reactions.

The lock and key hypothesis explains how each enzyme acts specifically on a certain substrate. The lock is the enzyme. The key is the substrate. The lock has a site where a specific substrate binds called th...
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Answered by Charlotte H. • Biology tutor
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What is speciation? Give an example of when speciation may occur.

Speciation is the formation of a new species that cannot interbreed with other species to produce fertile offspring. It may occur due to geographical isolation, such as the formation of a river separating th...
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Answered by Emily B. • Biology tutor
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In 2012, two scientists were awarded the Nobel prize for their research on stem cells. They showed that adult cells could be reprogrammed to become cells with the properties of embryonic stem cells. Describe the possible benefits of this research.

No need to use ESC.No rejection.Use to replace diseased cells by reprogramming and give rise to any cell type.
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Answered by Georgia S. • Biology tutor
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Can you explain the main events that happen during an action potential?

What is an action potential? When a stimulus of sufficient size is detected, it causes a temporary reversal of charges either side of the axon membrane. It also causes the channels in the axon membrane to ch...
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Answered by Dominique N. • Biology tutor
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Describe how the body maintains control of blood glucose

If the concentration of glucose in the blood is too high, this is detected by beta cells in the pancreatic islets, which release the hormone insulin . Insulin has several actions in the body: firstly, it inc...
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Answered by Michael B. • Biology tutor
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