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Biology

A Level

What is an enzyme? Can you provide an example of an enzyme found in plants and describe its function? (4 marks)

An enzyme is a protein that is a biological catalyst (meaning it speeds up the rate of a reaction). The most abundant enzyme on earth, Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), is an enzy...

Answered by • Biology tutor

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Explain the process of tissue fluid formation

At each point along the capillary bed, fluid movement is governed by 2 forcesHydrostatic pressureWater potentialAt the arteriole endBlood is under pressure -> high hydrostatic pressure forces fluid (pl...

Answered by Jack W. • Biology tutor

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What's the difference between facilitated diffusion and active transport?

I can see why you could get these two mixed up as both are movements of molecules which require a transport protein. There are, however, key differences between the two.Facilitated diffusion(FD) is a

Answered by Fazna R. • Biology tutor

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Explain how the structure of an egg cell is related to its function.

The egg cell is a specialised germ cell which has a haploid number of chromosomes in order to allow restoration of diploid number (46) at the time of fertilisation.The egg cell contains lipid droplets to ...

Answered by NESRIN G. • Biology tutor

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Describe the structure of proteins

A protein is composed of polymers of amino acids, joined together by peptide bonds via condensation.A primary structure is the order of ...

Answered by Annabel L. • Biology tutor

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