Name the scientist that first observed nonliving cells. 6. discuss the roles of schleiden, schwann, and virchow in the development of the cell theory. 7. analyze the three parts of the cell theory. 8. identify the characteristics shared by all living organisms. 9. state the relationship between cell shape and cell function. 10. identify the factors that limit the growth of cells. 11. draw the three major parts of a eukaryotic cell. 12. compare the structure of a prokaryotic cell with that of a eukaryotic cell. 13. sequence the relationship between organs, cells, organ systems, and tissues. 14. explain why a cell membrane is called a fluid mosaic. 15. describe the parts of a nucleus. 16. propose why muscle cells have more mitochondria than other kinds of eukaryotic cells have. 17. describe the role of ribosomes in cells. 18. compare the functions of the golgi apparatus with those of the er.

There are many discoveries that have changed the course of science and the world. Nikola Tesla’s discovery of alternating currents, for example, helped pave the way for widespread access to electricity, and Louis Pasteur’s discovery that heat and disinfectant could kill bacteria improved food safety and saved millions of lives. In 1655, the English scientist Robert Hooke made an observation that would change the study of biology forever. While examining a thin, dried section of cork tree with a crude lightmicroscope, Hooke observed that he could plainly see the cork to be made up of tiny spaces surrounded by walls, much like a honeycomb, but that the spaces were irregular and shallow (Figure 1). Further, Hooke noted that these "little Boxes" were so numerous that there were "in a square Inch above a Million... and in a Cubick Inch, above twelve hundred Millions [sic]" (Hooke, 1655).

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.

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