An aminoacyl-tRNA synthetase (aaRS or ARS), also called tRNA-ligase, is an enzyme that attaches the appropriate amino acid onto its corresponding tRNA. It does so by catalyzing the transesterification of a specific cognate amino acid or its precursor to one of all its compatible cognate tRNAs to form an aminoacyl-tRNA.
The functions of the American Kennel Club are to set breed standards, register and keep track of purebred dogs, classify different breeds, promote the improvement of purebred dogs, sponsor dog competitions held by licensed dog clubs, and award dogs in competition.
