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Pupils can either dilate or constrict in response to changes in light intensity.

In very bright light - the eyes constrict - as a protective mechanism
In very dull light/dark conditions - ...

In a population, random mutations of alleles will produce variation. Some of these mutations might be really helpful for the organism that has them and helps them to survive in their environment better. T...

RNA is a single stranded molecule, composed of a ribose sugar phosphate backbone (as opposed to the deoxyribose sugar phosphate double-stranded DNA) and the bases, adenine, guanine, cytosine and uracil (i...

The fluid mosaic model is a model used to describe the cell membrane and the transport of molecules through it. It is a semi permeable membrane which means that it is selective in the molecules that it al...

The structure of mRNA differs from the structure of DNA in that mRNA is a single-stranded molecule whereas DNA is a double-stranded molecule in the form of a helix. Another difference between them is that...