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DNA is made up of two long chain backbones, bound together and forming a double helix shape. These backbones are made up of repeating units, each of which have the following structure:

A ...

A carbohydrate is a long molecule made up of lots of individual units called monosaccharides. These units are sugars, including glucose, fructose and lactose.

When two of these units are ...

The majority of gerunds in Spanish correspod to that of the -ing ending in English. 

It can be used as a kind of adverb to refer to:

a simultaneous action,        Se ha ido ...

The perfect tense makes a distinction between the perfect tense (I have gone out) and the simple past (I went out). 

The form constits of the verb haber:

he

ha...

Diffusion is the movement of particles from an area of high concentration to low concentration (down a concentration gradient). This occurs because the particles move randomly, and eventually end up ev...