1 the set of exogenic (physical, chemical and biological) processes that alter the physical and chemical state of rocks at or near the earth's surface.  intensity of most weathering decreases with depth, because variations in temperature and moistures decrease with depth.
A gene is a segment of nucleic acid that contains the information necessary to produce a functional product, usually a protein. Genes consist of a long strand of DNA (RNA in some viruses) that contains a promoter, which controls the activity of a gene, and a coding sequence, which determines what the gene produces.
DNA contains the code for making lots and lots of different proteins. Messenger RNA contains the information to make just one single polypeptide chain-in other words for just one protein, or even just a part of a protein if it is made up of more than one polypeptide chain.