A Markov chain is a discrete random process with the property that the next state depends only on the current state (wikipedia). A Markov chain is a discrete random process with the property that the next state depends only on the current state (wikipedia). So $P(X_n | X_1, X_2, \ldots X_n-1) = P(X_n | X_{n-1})$.
Some people find molecules and compounds confusing. Here's how to remember the difference. If you join two different chemical elements together, you can often make a completely new substance. Glue two atoms of hydrogen to an atom of oxygen and you'll make a single molecule of water.
Quatr.us Chemistry. Protein molecules-each dot is one molecule. A molecule is a group of two or more Atoms that stick together. Molecules (MOLL-uh-cyools) are so small that nobody can see them, except with an electron microscope.Pretty much everything on Earth and other planets is made of molecules, and so is some of the dust in space.uatr.us Chemistry. Protein molecules-each dot is one molecule. A molecule is a group of two or more Atoms that stick together. Molecules (MOLL-uh-cyools) are so small that nobody can see them, except with an electron microscope.