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Plan an experiment that would allow you to determine the maximum voltage that can be achieved using strips of lithium, zinc, copper and aluminium.

i) Pick electrolyte (e.g. hydrochloric acid) - strong acid ii) Use same volume of electrolyte; Use same electrolyte throughout; iii) Cut same size strips; Connect wire to each metal; Connect to voltmeter; iv...
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Answered by Baranse O. • Chemistry tutor
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I don't understand how muscle contraction starts, can you explain it?

So, if we looks at the sarcomere of the muscle (which is from one Z line to another) you'll see a thicker looking strand/filament called myosin and thinner strands called actin. Myosin has bulbous structures...
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Answered by Monica K. • Biology tutor
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Name two organelles that are present in a plant cell that are not present in an animal cell and state their functions?

There are many organelles you could choose from so long as it is only present in plant cells and you can explain it's function it is appropriate. Examples include:Cell wall - provides structural support made...
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Answered by Thomas B. • Biology tutor
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Imagine you are a GP and a 15 year old female comes to you asking for the contraceptive pill to use as contraception. She does not want her parents to know about this. Describe what issues this raises and how you could go about addressing this?

This style of question is common at interview. Crucially it is split into two parts and it requires both parts answering in full. Although these might seem like scary or perhaps even embarrassing topics to t...
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What is the difference between chromatin and a chromosome?

The difference between chromatin and chromosome can be highlighted when using the analogy of a wool. Chromatin is the unwound wool pile of wool where as chromosomes are the tightly wound and condensed wool b...
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Answered by Francesca B. • Biology tutor
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