Top answers

What is the definition of osmosis?

Osmosis is the process describing the random movement of water molecules through a permeable membrane from an area of high water concentration to an area of low water concentration until equilibrium is reached.
FM
Answered by Finlay M. • Biology tutor
4269 Views

Which type of electromagnetic radiation has the longest wavelength?

Radio waves
TD
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Explain how mRNA is formed. (6 marks)

DNA helicase breaks the hydrogen bonds between the base pairs in the double-stranded DNA. RNA nucleotides then line up beside their corresponding nitrogenous base (A-T, C-G) along the template strand of the ...
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Answered by Laura N. • Biology tutor
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How are B cells activated?

A phagocyte will engulf the pathogen by endocytosis. The vesicle containing the pathogen will fuse with the lysosome where it is degraded by hydrolytic enzymes. Short peptides of the pathogen will be display...
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Answered by Eleanor B. • Biology tutor
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Derive an expression to show that for satellites in a circular orbit T² ∝ r ³ where T is the period of orbit and r is the radius of the orbit.

For an object to stay in a steady orbit; F=mv 2 /r where: F is the force on the object towards the centre of the orbit, m is the mass of the object, v is the radial velocity of the object, and r is the radiu...
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Answered by James M. • Physics tutor
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