A hollow spherical shell with mass 2.35 kg rolls without slipping down a slope that makes an angle of 38.0 ∘ with the horizontal. Find the magnitude of the acceleration acm of the center of mass of the spherical shell

As its name implies, an STR contains repeating units of a short (typically three- to four-nucleotide) DNA sequence. The number of repeats within an STR is referred to as an allele. For instance, the STR known as D7S820, found on chromosome 7, contains between 5 and 16 repeats of GATA. (From google) there might be more information there!!