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Biology
A Level

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....

Answered by Kieran L. Biology tutor
3163 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...

Answered by Johanna H. Biology tutor
19451 Views

What is the Hardy-Weiberg principle? How do I use the calculations? What are the limitations?

The Hardy-Weinberg principle is used in population genetics. Population genetics is the study of allele frequencies in populations and how they change over time. There are 2 equation used in the H...

Answered by Jessica L. Biology tutor
2657 Views

Maltase is an enzyme found in the body that breaks down maltose. Explain why maltase can only catalyse this reaction?

All enzymes have active sites which are highly specific to their role within the body- the active site being the part of the enzyme in which the enzyme and the substrate (the thing it is reacting with) in...

Answered by Johanna H. Biology tutor
6024 Views

Describe how heart action is coordinated with reference to the SAN, AVN, and Purkyne Tissue, and explain the importance of the valves within the heart (8 marks)

The SAN (pacemaker) sends a wave of excitation across both atria. This triggers atrial systole, where both atria contract simultaneously. There is a time delay at the AV Node which al...

Answered by Octavia B. Biology tutor
3675 Views

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