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Define osmosis

Osmosis is the movement of water across a semi-permeable membrane
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What is the electron transport chain and what is its function?

The electron transport chain is a series of four protein complexes , along with accessory electron carriers, e mbedded in the inner mitochondrial membrane of mitochondria . The enzyme ATP synthase is closely...
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Answered by Joshua J. • Biology tutor
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Describe the reactions that link glycolysis to the krebs cycle

Firstly, try to remember what the intermediate reaction was called (Link Reaction). Name this, as if the name was not stated in the first place in the question, the examiner is most likely looking for your k...
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Answered by Seth E. • Biology tutor
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Describe three effects of smoking on the alveoli

Answers could include:Thinning of alveoli walls to reduce the size of the alveoli air sacsSacs lose their elasticity leading to a difficulty in expelling carbon dioxide and taking in oxygenDecrease in diffus...
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Answered by Tash B. • Biology tutor
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Define the term 'water potential' and describe the difference between isotonic, hypotonic and hypertonic solutions. Suggest the different effects on cells placed in the different solutions.

Water potential basically means how likely it is for water molecules to diffuse out of or into a solution.Pure water (i.e. water with no solutes) has a water potential value of 0.As you add solutes (i.e. sug...
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Answered by Elliot T. • Biology tutor
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