ATP synthase is an enzyme present in both mitochondria and chloroplasts. The diagram below shows a generalized representation that fits the function
of ATP synthase in both organelles. Armed with this information and this
diagram, which of the following questions might a biologist ask to further
study this enzyme?

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.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.