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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...
ET
Answered by Elliot T. • Biology tutor
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Describe the role of a ribosome in the production of a polypeptide

mRNA from the nucleus binds to a ribosome which is either free in the cytoplasm or associated with the rough ER. The ribosome binds at the 5' end and scans to the start codon (AUG). The ribosome allows tRNA ...
JM
Answered by Josh M. • Biology tutor
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What are the key structural differences between a eukaryotic and prokaryotic cell?

Eukaryotic Cells - Eukaryotic cells are multicellular and more complex- Contain membrane bound organelles, so this includes a nucleus, which contains the genetic material as chromosomes, but other organelles...
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Answered by Adam A. • Biology tutor
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Integrate 3t^2 + 7t with respect to t, between 1 and three.

To integrate you add one to the power and divide by the new power, so this becomes:3t 3 /3 + 7t 2 /2 simplifying to t 3 + 7/2 t 2 If we were just performing indefinite integration you would need to remember ...
JM
Answered by Josh M. • Maths tutor
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ii) The maximum permitted sulfate concentration in water is 250mg dm^-3, 200cm^3 of aqueous BaCl2 is added to 300cm^3 of water at the maximum permitted sulfate level, and a white precipitate formed. Calculate the minimum conc. (mol dm^3)of the BaCl2

250x10^-3= 0.25g dm -3 sulfate mr x moles = mass0.25 x 3/10 = 0.075 g sulfatemr sulfare = 32 + (4 x 16) = 96moles sulfate = 0.075/96 = 7.8125 x10 -4 Per equation above: moles SO 4 2- = moles Ba 2+ Concentrat...
JM
Answered by Josh M. • Chemistry tutor
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