BIOL 1201 : Test 1 Notes
Document Summary
Antarctic fish are ectothermic and live at -2 c. Deep sea fish live at 7000m below the surface at high pressure and low temperature. Penguins, humans, tuna, great white sharks are endothermic. Barophiles (piezophiles) are pressure loving and thrive at pressures that would kill other bacteria. Halophiles live in osmotic equilibrium with 3 molar salts. Mid water fish living in water columns achieve neutral buoyancy despite high density of the biological materials. There are 92 naturally occurring elements, 112th copernicium and 6 unconfirmed others. Compared to protons and neutrons, electrons are massless. Atomic mass is the number of protons and neutrons. The valence shells determine the number of chemical bonds. The type of bond is determined by electronegativity (the tendency of an atom to attract a binding pair of electrons) Covalence bonds are strong bonds involving the sharing of electrons. Weak bonds are non-covalent ionic interactions (attraction of opposite charge) One atom donates an electron to the other.
