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Species change over time by a process called natural selection. This is commonly associated with Darwin, as he wrote about it in his book "On the origin of species". Evolution (the change of a spec...

The mRNA binds to a ribosome at the start codon. (1) The ribosome has a space for a tRNA molecule with a three base anticodon to bind to the complementary codon on the mRNA.(2) The tRNA brings the specific a...

Eutrophication occurs when mineral ions from the soil such as nitrates are leached (washed away by the rain) and they run into rivers, lakes and ponds. This increase in nutrients into the water causes an inc...

Photosynthesis is the process that plants use to make their food. Photosynthesis takes part in the leaf of the cell in small structures called chloroplasts which contain chlorophyll. Reaction uses light, car...

The key difference between these two processes is that diffusion is the movement of particles from a region of high concentration to a region of low concentration, whereas in active transport the molecules m...