What would happen if tropomyosin couldn't change confirmation in the presence of Ca2+ binding to troponin?

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation