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How do internal stimuli affect a positive and a negative feedback loop?

Deviation from homeostasis causes the activation of feedback loops in order to restore equilibrium to the organism. An example of a negative feedback loop is the homeostasis of blood glucose; the increase in...
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Answered by Alexia K. • Biology tutor
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What is another model for enzyme activity?

Another proposed model is induced fit. This suggests that the substrate and active site are not a perfect match to each other. So inorder to fit together both the substrate and active site must change shape ...
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Answered by Emily M. • Biology tutor
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How is the structure of alveoli suitably adapted for efficient gas exchange?

Very thin walls result in a short diffusion distance which makes gas exchange particularly favourable. Lots of branches and sacs result in a large surface area so gas exchange can be maximised.
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Answered by Alastair P. • Biology tutor
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What are the differences between exons and introns found in DNA.

Exons are coding regions of DNA, and are copied into mRNA and transcribed as proteins. Introns are non-coding regions of DNA, and are spliced out of pre-mRNA so are not copied into mRNA.
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Answered by Alastair P. • Biology tutor
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What is homeostasis?

Homeostatis is the regualtion of the internal conditions of the body to ensure that everything remains balanced.
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Answered by Amna R. • Biology tutor
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