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What is Osmosis?

The one definition of osmosis is 'The movement of water from a high concentration to a low concentration, down it's concentration gradient, across a partially permible membrane, until osmotic pressue is equa...
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Answered by Alexandra V. • Biology tutor
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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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Describe homoeostasis using temperature control as an example.

Homeostasis is the maintenance of a constant internal environment. The body tends to use a series of negative feedback loops to allow this. Using temperature as an example, the body likes to maintain a core ...
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Answered by Priya S. • Biology tutor
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State the difference between a malignant and benign tumor is and describe how tumors form

Malignant tumors are cancerous, harmful tumors whereas benign are non-cancerous. Tumors are caused by a mutation which causes uncontrolled cell division.
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Answered by Esther W. • Biology tutor
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