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.
Proteins are made up of specific sequences of amino acids, and segments of dna, called genes, contain the instructions for individual proteins. The DNA molecule is too large to escape from the cell nucleus into the cytoplasm, but a âcopyâ is made in the form of messenger rna, (mRNA) and this travels to the ribosomes.