Pyrimidines {Ans: cytosine, thymine, in rna uracil hydrogen bonded}Cytoskeleton {Ans: A network of long protein strands in the cytosol that helps support the cell}Nucleotide {Ans: monomer of nucleic acids made up of a 5-carbon sugar, a phosphate group, and a nitrogenous base}Purine bases {Ans: Adenine and Guanine, double ring structure hydrogen bonded}calcitonin (CT) and parathyroid hormone (PTH) {Ans: Important in regulation of blood vessels and calcium ions}Sagittarius plane {Ans: divides the body into right and left sides}