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How does the lac operon work?

The lac operon has 3 components: the promoter (Binding site for RNA polymerase), the operator (binding site for the repressor) and the structural genes that code for the enzymes required for lactose metaboli...
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Answered by Elena B. • Biology tutor
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Describe and explain some of the direct and indirect effects of carbon dioxide on organisms?

Carbon dioxide only comprises 0.04 % of the earth’s atmosphere but it is a vital molecule in many processes and effects organisms directly with photosynthesis in plants, body functions causing global warming...
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Answered by Katie D. • Biology tutor
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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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