Top answers

What are the differences between DNA and RNA?

-DNA is double stranded, while RNA is single stranded -DNA has the bases ATCG, while RNA has AUCG -DNA has the sugar base Deoxyribose, RNA has Ribose -DNA forms a double helix, RNA does not form a double helix
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Answered by Siddhesh K. • Biology tutor
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Explain how nerve transmission occurs at the synapse.

As an action potential arrives at the presynaptic knob, the membrane is depolarised. This causes calcium channels in the membrane to open and calcium ions to flood in. This influx of calcium causes vesicles ...
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Answered by Abigail H. • Biology tutor
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What is the process of saltatory conduction and why is it important in the human nerve system?

Many (Not all) neurons are myelinated by schwann cells. The myelination covers the neuron with a fatty layer with small gaps between each schwann cells. These small gaps are called nodes of ranvier. When an ...
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Answered by Han Y. • Biology tutor
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Describe how water moves from roots to the leaves.

Water moves from the roots to the leaves through tissue called the xylem, in a process called transpiration. As water evaporates out of the leaf, more water is 'pulled upwards' to replace what has been lost.
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Answered by Philippa S. • Biology tutor
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Maltose is hydrolysed by the enzyme maltase. Explain why maltase catalyses only this reaction.

The enzyme maltose will always fold into in a tertiary structure, which results in the active site being in a specific shape that only the substrate maltase can bind to. This is often illustrated using the a...
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Answered by Philippa S. • Biology tutor
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