03 - Learning Objectives: Explain the chemical forces...

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Learning Objectives: Explain the chemical forces determining DNA structure. Describe how base pairs can be identified in the major groove based on H-bond donors and acceptors. Describe the conformational features of A, B, and Z DNA structures and when each structure occurs in vivo.
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Noncovalent: -within individual molecule and between oppositely charged ions (huge difference in electro-negativity) -complete transfer of electrons. -weak in water Ionic
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Noncovalent: polarity: H atom covalently attached to a very electronegative atom (N, O or P; donors, D ) has partial positive charge partially positive H could be attracted by another electronegative atom (acceptor, A ) and it can form a weak hydrogen bond with it. Weak in water Hydrogen bonds
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Van der Waals interactions Noncovalent: Between all types of molecules (nonpolar AND polar) cause is transient, unequal movement and distribution of electrons – formation of temporary dipoles; dipole of one molecule “helps” electrons of the second molecule to arrange into dipole (+ve attracts –ve)… those interactions decrease with distance, but if too close - repulsion works well only if few atoms from one molecule are at the same distance from few atoms from the other molecule esp. if good (complementary) fit
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This note was uploaded on 05/16/2011 for the course BIOL 308 taught by Professor Miskovic during the Spring '09 term at Waterloo.

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03 - Learning Objectives: Explain the chemical forces...

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