KINE 2011 Study Guide - Adenine, Cortisol, Cytosine

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The sizes of structures are relative: can see (biggest to smallest) With a light microscope/electron microscope (in m 1/1 000 000 m): With an electron microscope (in nm 1/1 000 000 m): 96% of the body consists of oxygen (most common by mass), hydrogen (most common by relative number), nitrogen, and carbon. Most common molecule in the body water. Bonds (strongest to weakest): covalent atoms share electrons. Hard to break without enzymes in the human body. Some release more energy than others depending on the strength of the bond: ionic gaining or losing electrons, opposite charges attract. Ions are not neutral: hydrogen the attraction between the positive charge in a polar molecule to the negative charge of another polar molecule, van der waals attraction between non-polar molecules due to close proximity. Solute dissolved, relatively small in size. Colloids relatively large in size (100kdaltons +), usually charged, do not succumb to the force of gravity.

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