Study Guide - Midterm 1 Essay

808 WordsOct 16, 20144 Pages
A biomolecule can dissolve in water if it can form significant non-covalent interactions with the solvent molecules. True- like dissolves like, polar dissolves polarTwo polyanionic strands of DNA can associate into a double-helix because the sum of non-covalent bond energies between the two strands exceeds the sum of covalent bond energies within the two strands. False because what keeps them together is Hydrogen bonding.Repellant forces would repel the molecules if the hydrogen bonds weren’t there. Hydrogen bonds wouldn’t work against the covalent forces. Noncovalent attractive forces exceed repulsive forces. The appropriate pH range for a buffer solution is where the conjugate base to acid ratio is close to one. trueA hydrogen…show more content…
coli DNA replication by taking advantage of the melting properties of DNA duplexes. They used centrifugation in their experiments. **** ask!! Both dCMP (MW = 307 g/mol) and octadecanoate (MW = 284 g/mol) are negatively charged ions, yet only dCMP is freely soluble in water. Explain in structural terms. dCMP is able to form hydrogen bonds, and is hydrophilic, whereas octadecanoate largely hydrophopic. *** add drawing Be specific about the structure*** name the functional groups, draw them out, all that good stuff. Explain when and how a solution of a weak acid functions as a buffer. Partially weak acids don’t fully react to completion to release all their protons, and so do not react fully, and do not change the pH dramatically. This depends on buffering capacity and concentrations. Explain, using the appropriate equation, how concentrations of reactants and products can make a reaction favorable even when ^G is positive. G =deltaG^not + RTlnQ *** explain more fully Q = concentration of products over reactants Ln of Q<1 is negative, So when concentration of reactants is large, G will be negative. Contrast the structural features of B-DNA with any other known DNA secondary structure. *** I don’t know! Suppose Meselson and Stahl grew their E.coli cells first in the NH4CL before the switch to an 15N-containing medium. Would their conclusions have changed? Explain. Their conclusion would not have
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