The burning of fossil fuels by humans is the largest source of emissions of carbon dioxide, which is one of the greenhouse gases that allows radiative forcing and contributes to global warming.
The genetic code. Efforts to understand how proteins are encoded began after DNA's structure was discovered in 1953. George Gamow postulated that sets of three bases must be employed to encode the 20 standard amino acids used by living cells to build proteins, which would allow a maximum of 43 = 64 amino acids.
This is possible because the DNA sequence code of a particular gene is copied into a protein sequence code. DNA determines what proteins are made, how much and when.Proteins include enzymes which speed up reactions, hormones, immunity proteins, structural proteins and many more. change in DNA sequence can mean a change in protein sequence. So basically. DNA is a chemical which makes up genes and the gene's code is copied into a protein.