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.
The DNA has coded information for the production of specific proteins(enzymes are mostly proteins). It transfers this informtion to an RNA. The RNA with the help of ribosome strings together amino acids which together in a particular sequence form a particular protein. This protein acts as an enzyme.