Modern life has the traits of an autocatalytic set, since no particular molecule, nor any class of molecules, is able to replicate itself.

Suppose this were so and that a particular small molecule bombarded the cell membrane from without.

If the particular molecule we are discussing existed also inside the cell, it would be bombarding the inner surface of the membrane as well.

It is not possible to make an accurate identification of a particular molecule by gas chromatography or mass spectrometry alone.

Computer simulations allow us to monitor the local environment of a particular molecule to see if some chemical reaction is happening for instance.

The goal is to find particular molecules in a cell that drive proliferation or tumor survival, and to block them.

The speed of any particular molecule in a gas is always changing.

The synthesis of the new compound does not suggest that life originated with this particular molecule.

With respect to greenhouse gases, residence time usually refers to how long a particular molecule remains in the atmosphere.

The type of bonding also depends upon the physical state of the particular molecule.