BIO 1140 Chapter Notes - Chapter 2: Chemical Polarity, Hydrogen Bond, Polyunsaturated Fat

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U(cid:374)dersta(cid:374)d the role, ide(cid:374)tif(cid:455) areas a(cid:374)d deter(cid:373)i(cid:374)e the i(cid:373)porta(cid:374)(cid:272)e of a (cid:373)ole(cid:272)ule"s polarity (electronegativity) of different biologically relevant macromolecules (particularly amino acids and proteins) Explain the relationship between polarity, molecular structure, cellular location and function particularly for proteins and lipids. What are the types of chemical bonds present in cellular macromolecules and how are they relevant to cell biology. What is the importance of water in biology. Know and identify the main classes of macromolecules, recognize their general structures, and interpret these in relation to their cellular location and their roles in cells. Covalent bonds: two atoms share a pair of electrons to complete outer shells. Difference of 0. 7 electronegativity or greater btwn atoms make the bond polar. Double bond: 2 pairs of electrons being shared between two atoms; shorter and stronger. More rigid arrangement; single bond allows rotation of the atoms. Ionic bonds: electrons are donated by one atom to another; electrostatic attractions i. e nacl.

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