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Can you explain the process of ultrafiltration and selective readsorption?

Ultrafiltration and selective reabsorption are processes which occurs in the kidney to filter the blood. In ultrafiltration, the blood is under a high pressure in the glomerulus which causes ions and small m...
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Answered by Daniel S. • Biology tutor
15153 Views

Explain the principle of the surface area to volume ratio and how it applies to gas diffusion in different organisms.

The surface area to volume ratio of an object will decrease as the size of the object increases. This means that a small object with a small volume will have a bigger surface area, as a proportion or fractio...
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Answered by Yan S. • Biology tutor
18998 Views

Explain how vaccination prevents illness in an individual

Vaccination involves the injection of small amounts of a pathogen - a microbe that causes disease - that is either dead or modified to provoke an immune response. Although these pathogens cannot cause diseas...
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Answered by Jack K. • Biology tutor
3984 Views

Explain how bacteria are important in cycle within ecosystems.

Bacteria are important in the carbon cycle, because they produce carbon dioxide by breaking down dead animal and plant matter. Therefore, they act as decomposers.Bacteria are important in the nitrogen cycle,...
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Answered by Lily P. • Biology tutor
13783 Views

What is the difference between mitosis and meiosis

Both are forms of cell division. All 'normal' cells undergo mitosis to produce identical copies of themselves with the same number of chromosomes. This increase in cell number leads to growth/repair of tissu...
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Answered by Hasan R. • Biology tutor
2591 Views