The value of screening mammograms was questioned in November 2009 when the U.S. Preventive Services Task Force recommended that routine screening mammograms for women with an average risk of breast cancer should start at age 50 instead of age 40.or example, mammograms have been shown to lower the risk of dying from breast cancer by 35% in women over the age of 50. In women between ages 40 and 50, the risk reduction appears to be somewhat less.
Vocabulary alkane alkyl group hydrocarbon An alkyl group is a piece of a molecule with the general formula CnH2n+1, where n is some integer. For example, a methyl group (CH3) is a fragment of a methane molecule (CH4); n = 1 in this case. The-yl ending means a fragment of an alkane formed by removing a hydrogen.n alkyl group is a piece of a molecule with the general formula C n H 2n+1, where n is some integer.
Hydroxyl Functional Group. In organic chemistry the hydroxyl group is define as the functional group in alcohols also being a part of other organic chemical structure like natural products, drugs, and present in some biochemical structureaâ¬âstructureÃ¢ in sugars and in some amino acids like threonine and. phospholipidsor example, Phosphate group is an example of that functional group in which there is multiple bonds with hetero atom like phosphorus. In phosphate functional group one of the oxygen atoms bonded with phosphorus atom as well as one alkyl group.