A cell is poisoned by a toxin which inhibits ATP synthesis. The atomic number is the number of protons plus neutrons in the nucleus of an atom. The primary structure of a polypeptide chain is the sequence of amino acids. An atom is the smallest portion of an element that retains its physical and chemical properties. A theory is a trial idea about the nature of the collected data.
All electrons have the same amount of energy.
When an atom with a of 1 loses an electron, it becomes an isotope. A solution of pH 7 is neutral. A carbon atom has 5 electrons to share with other atoms. The tertiary structure of a protein is determined by its primary structure. The cellular ultrastructure can be viewed with the light microscope.