Which of these could be caused by a single-celled organism? * John left a bicycle out in the rain, and it began to rust.
Joe mixed baking soda and vinegar, and it started to bubble.
Mikayla left the milk out overnight, and it smelled sour the next day.
Jenny put sugar into some iced tea and stirred it until she could not see the sugar anymore.

protocol for imps extraction focusing on membrane protein extraction, solubilisation, and purification.

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.