Best Answer: Probably the same as any other major... probably even shorter than some (such as pre-med), so 4 years. For my school, you need Intro, Research Methods ...
Digestion of foods in the small intestine. The small intestine continues the process of digestion and various enzymes are present there to break starches down further. These enzymes are called disaccharidases. The best known is lactase, which is the enzyme necessary to digest milk sugar. This enzyme is normally present in all young mammals who need this to digest mother's breast milk. With age and as breast feeding finishes, production of this enzyme ceases for life.
This involves a molecular mechanism in which the gene for lactase, needed for digesting milk, is turned off at the end of the weaning period. Lactase is an enzyme needed for the metabolism of the lactose sugar found in milk.So while young mammals are able to digest milk from the mother they will reach a stage shortly after weaning when the consumption of milk will incur abdominal cramps and diarrhoea.actase is an enzyme needed for the metabolism of the lactose sugar found in milk. So while young mammals are able to digest milk from the mother they will reach a stage shortly after weaning when the consumption of milk will incur abdominal cramps and diarrhoea.