Top answers

By what process do proteins leave a cell?

Exocytosis. Vesicles transport proteins from the Golgi apparatus to the plasma membrane
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Answered by Robert H. • Biology tutor
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What are enzymes and how do they work?

Enzymes are what are called 'biological catalysts;' that means they speed up how fast a reaction takes but they are unchanged by the reaction themselves. They work by lowering the activation energy needed fo...
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Answered by Tom D. • Biology tutor
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How is a nervous impulse transmitted across a synapse?

An action potential (AP) reaches the pre-synaptic membrane. This causes the voltage-gated calcium channels to open, and calcium ions flow down their concentration gradient into the pre-synaptic terminal. Thi...
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Answered by Teodora N. • Biology tutor
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Describe prions and their function, give example of prion disease

Prions are certain proteins naturally occuring in organisms that have assumed wrong conformation during folding. This misfolded structure is highly infectious - if it comes into contact with healthy version ...
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Answered by Klára N. • Biology tutor
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Explain the role of auxins in the control of phototropism

A phototropism is the growth of a plant in response to light. This is mediated by auxins such as IAA (Indoleacetic acid). This is released in the tips and shoots of flowering plants. In response to light IAA...
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Answered by Florence T. • Biology tutor
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