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In peptides and proteins (peptides simply being smaller proteins), the amine nitrogens of amino acids are linked to the carboxyl carbons of other amino acids by peptide (aka amide) bonds formed by condensation reactions (i.e., removal of H2O). Consider the free amino acid glycine and a di-, tri-, and tetrapeptide comprised of glycine. Circle the one that would have the terminal amine group (i.e. free; not involved in a peptide bond) with the highest pKa.
(i) amine-Gly-carboxyl (ii) amine-Gly-Gly-carboxyl (iii) amine-Gly-Gly-Gly-carboxyl(iv) they would all have the same pKa
Rank PhCH3, Ph2CH2, and Ph3CH in order of acidity Rank the following compounds from most acidic to least
A tap water sample is to be analyzed for nickel at the ppm level, which method would yield accurate results with the least amount of sample preparation?
How would I do that? I have a diagram for a trigonal bipyramidal crystal field and two values are on the diagram. There's a delta 0.19 and a delta 0.79.
Draw one energy diagram showing both reaction pathways & label all transition states, intermediates and products as well as activation energies.
How many constitutionally isomeric monochlorides are capable of being formed in the free-radical chlorination of 2,4-dimethylpentane
Assume your solution contains lead and iron but not silver or nickel. Explain how will you know that: - Either silver or lead is present ( that is, describe what you will see that will tell you at least one of these is there)
Calculate the pH at 25°C of an aqueous solution that is 0.320 M in ethylamine and 0.140 M in ammonia (i.e.the solution contains both compounds).
a monoprotic acid that dissociates in aqueous solution. If a solution containing 0.50 M lactic acid is 1.66 percent dissociated to ionic form, calculate the value of Ka for lactic acid.
A voltaic cell consists of an Mn/Mn2+ half-cell and a Pb/Pb2+ half-cell. Calculate Ecell when [Pb2+] = 0.616 M and [Mn2+] = 1.069 M. You should use the reduction potentials for Mn2+ is -1.18 V and for Pb2+ is -0.125 V.
Two spectral lines occur at 576.8217 nm and 577.1432 nm. If a grating monochromator has a reciprocal linear dispersion, D^-1, of 2.4 nm/mm, what is the maximum slit width, in mm, needed to achieve baseline seperation.
How many kilograms of CaH2 are needed to fill a 134 L tank with compressed H2 gas at 154 atm pressure and 22 degrees celsius?
Polychlorinated biphenyls (PCBs), which were formerly used in the manufacture of electrical transformers, are environmental and health hazards. They break down very slowly in the environment. The decomposition of PCBs can be represented by the equ..
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