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Biology
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Explain the consequences of using high levels of nitrogenous fertilisers

Eutrophication is the process of artificially increasing the mineral content of water as a result of nitrogen-containing fertilisers, especially nitrates, leaching from agricultural land. The nitrates and...

JW
Answered by Jessica W. Biology tutor
2698 Views

How might you estimate the population size for a species of bird?

As birds are a motile organism, we would use the mark-release-recapture method. First, capture a sample of individuals (possibly through mist netting), mark them (e.g. a wing tag or leg ring) and release....

KL
Answered by Kieran L. Biology tutor
4052 Views

Describe the process of DNA translation

Defining 'translation' as the process of protein synthesis where an mRNA sequence produced in DNA transcription is translated into an amino acid sequence (polypeptide)
Translation can be subdivided ...

GM
Answered by George M. Biology tutor
2821 Views

Explain the effect of inhibitors on the activity of enzymes.

Enzyme inhibitors are substances that alter the catalytic action of an enzyme. There are two types of inhibitors: competitive and non-competitive. Competitive inhibitors bind at the active site of an enzy...

VV
Answered by Vasiliki V. Biology tutor
6330 Views

Describe the role of calcium ions and ATP during muscle contraction

Calcium ions diffuse from the sarcoplasmic reticulum and bind to troponin. This binding to troponin causes tropomyosin- which at rest blocks the actin-myosin binding sites- moves to expose these binding s...

JH
Answered by Johanna H. Biology tutor
24660 Views

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