1.   All the different complex organic molecules work together to form the entire organism.

2.   For more complex molecules in whose spectra vibrational detail is not resolved, assignments are difficult to make.

3.   None the less, simple systems are widely used to do abinitio calculations accurate enough to answer important questions for reasonably complex molecules.

4.   Once self-replication had got under way molecules could pile on other more complex molecules in a loose association.

5.   One idea that has been suggested is that the precursors of life - complex organic molecules - arrived here from outer space.

6.   We know, too, that meteorites often do contain complex organic molecules.

7.   But even the simplest nucleic acids are complex molecules.

8.   But genes do most of their work by instructing cells to manufacture proteins, complex molecules made up of amino acids.

9.   But GLXA turns out to be a glyco-lipid, which is a complex molecule that contains both fats and carbohydrates.

10.   But they had been bedeviled by how to apply the X-ray technique to the far more complex three-dimensional molecules, like proteins, that make up living organisms.