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Discuss some of the limitations of the use of tidal energy.

One of the limitations include cost, of setup, installation and maintenance. But more sublty there are undetermined envronmental implications, and issues with the energy storage and distribution due to the f...
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A curve has parametric equations x=t(t-1), y=4t/(1-t). The point S on the curve has parameter t=-1. Show that the tangent to the curve at S has equation x+3y+4=0.

To anwser this question we need to find a linear equation of the form y=mx+c which we can rearrange to give the desired equation. Firstly, we must find the gradient at the point S given by dy/dx. Using the p...
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Answered by Marcus F. • Maths tutor
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Describe the function of ribosomes in protein synthesis.

Ribosomes, which are made up of rRNA, are instrumental in the translation of mRNA into proteins. The ribosome has a large and a small subunit, which sandwich around a strand of mRNA. This mRNA attaches to th...
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Answered by Luke G. • Biology tutor
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Is memory reliable?

P.E.E.P What memory is/ stance on question. Memory is a complex psychological construct, that can generally be seen as the storage and retrieval of information. Memory can be broadly conceptualised into shor...
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Answered by Meg F. • Psychology tutor
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Explain how the proteins troponin, tropomyosin, actin and myosin regulate muscle contraction.

When the muscle is relaxed, tropomyosin fibres wrap around the actin filament, covering up the sites at which myosin can bind with actin. During muscle contraction, Ca2+ ions bind to troponin complexes on th...
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Answered by Alice T. • Biology tutor
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