How many cases of measles were reportes in the united states in 1962 the year before the measles vaccine was licensed how many cases were reported in 5 years later

before it leaves the nucleus of a eukaryotic cell, mrna is altered in the following ways: - a cap is added to the 5' end of the mrna molecule; - a poly a tail is added to the 3' end; - introns are removed and exons are spliced together.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.