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Explain these 3 terms in relation to cells and osmosis: isotonic, hypertonic and hypotonic?

These 3 terms all describe the 3 possible concentrations of a solution in respect to the water potential surrounding a cell. Isotonic solution (Iso=same and tonic=strength) is where the extracellular fluid h...
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Answered by Katie D. • Biology tutor
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What are the main components and properties of a plasma membrane?

A plasma membrane is composed mainly of an unordered phospholipid bilayer (double layer) embedded with membrane proteins which forms a thin flexible sheet. This gives the membrane several general properties ...
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Answered by Katie D. • Biology tutor
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Describe the effects of cigarette smoke on the airway.

Cigarette smoke contains a number of harmful chemicals such as Tar, Carbon monoxide and Nicotine. Tar settles on the lining of the airway and alveoli, increasing the diffusion distance for the gases oxygen a...
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Answered by Kristen D. • Biology tutor
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What are Enzymes and how do they work?

What is an Enzyme? Enzymes have an essential role in the reactions in the body from respiration to digestion. Enzymes are globular proteins with a specific tertiary shape. Enzymes are Biological Catalysts Su...
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Answered by Katie D. • Biology tutor
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What is the structure of proteins?

Most proteins have 3 or 4 levels of structure which include the primary, secondary and tertiary structure, with many also having a Quaternary structure. Firstly, the primary structure is the unique sequence ...
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Answered by Katie D. • Biology tutor
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