An adaptor can be thought of as a tool that converts an input to a new or modified use. Explain how the structure of the tRNA molecule helps it function as an adaptor to translate the mRNA code into a sequence of amino acids.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

density and pressure

regulate growth

produce insulin

control bladder

regulate bone calcium

control metabolism

produce adrenaline