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All cells use DNA as a code for making proteins: the sequence of base pairs in a long, string-like DNA molecule acts as a set of instructions for making a protein, which is also a long, string-like mol...

Sometimes two molecules can exist as non-superimposable mirror-images. That is to say, the mirror image of a molecule cannot be exactly placed on top of the original molecule.

A good exam...

Firstly, you would start by stating or introducing a point. Secondly, you must provide evidence to support this point. A common way of doing this is by using research to support or challenge this point...

Both "estar" and "ser" mean "to be". However "estar" should be used when describing something temporary. For instance, when describing a location or explaining a...

Diamond has a giant structure of carbon atoms held together by strong covalent bonds:  - Diamond is made up of many strong covalent bonds, so a lot of energy is needed to overcome them, so diamond has a h...