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Describe the differences in cell structure between animal, plant and bacterial cells

Cells are the micro building blocks of all living organisms, and though there are many different kinds allowing us to have many different functions, we will focus on the basic ones associated with animals, p...
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Answered by Anna S. • Biology tutor
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Explain how eutrophication can lead to the death of aquatic organisms? (6 marks)

1 - Fertilisers (eg NPK) used in agriculture are washed into local water sources such as rivers and lakes by rainwater/surface run off 2 - These nutrients enable algae to grow, leading to the formation of al...
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Answered by Amy W. • Biology tutor
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Explain the types of enzyme inhibition

There are two key ways by which enzymes can be inhibited. Competitive inhibition - this involves a molecule other than the substrate binding to the active site of the enzyme (the location where the substrate...
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Answered by Isobel J. • Biology tutor
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Explain the passive transport mechanisms across a cell membrane, differentiating between simple diffusion and facilitated diffusion.

Substances move down a concentration gradient in passive transport, meaning that no energy input (ATP) is required. Hydrophilic molecules will pass down the membrane using facilitated diffusion, as they cann...
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Answered by Rares P. • Biology tutor
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What is the role of receptors in mediating steroids and protein hormones?

Steroid hormones are lipids; they can cross directly through the cell's plasma membrane and nuclear membrane, binding to receptors. Receptor – hormone complex is formed and serves as a transcription factor; ...
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Answered by Rares P. • Biology tutor
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