1) Read section 12.8 and complete the following two questions: a) If you want to know the distance from the nucleus at which an electron is most likely to be found, should you look at a probability distribution plot (electron density map) or at a radial probability distribution plot? Or would both of them give you the answer? Explain your reasoning. b) If you wanted to know the locations of the radial (spherical) nodes in an orbital, should you look at a probability distribution plot (electron density map) or at a radial probability distribution plot? Or would both of them give you the answer? Explain your reasoning.
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Related questions
A mutant alkaline phosphatase was isolated that contained a leucine in place of alanine. With methyl phosphate, ethyl phosphate, and p-nitrophenylphosphate, kcat differed by less than a factor of three (i.e., not very much) from the kcat of the wild-type enzyme for the same substrates. However, the Km values varied significantly:
Substrate | Km mutant/Km wild-type |
Methyl phosphate | 5.2 |
Ethyl phosphate | 48 |
p-nitrophenyl phosphate phospate | 270 |
note: Km mutant/Km wild-type is merely the Km for the mutant (AlaâLeu) enzyme divided by the Km for the wild-type enzyme.
a. a. Succinctly explain these observations, using diagrams as you deem appropriate. Include the structures of the substrates somewhere in your answer (or draw them separately). Donât read too much into the exact values of the relative Km values.
b. Make an accurate Lineweaver-Burk plot for wild-type and AlaâLeu alkaline phosphatase with methyl phosphate as the substrate if kcat = 10 sâ1 for both enzymes, [E]Σ = 10 nM, and Km = 2 mM for wild-type enzyme. Make one plot with two linesâone line will be for wild-type enzyme, and one line will be for AlaâLeu enzyme. Both lines will be with methyl phosphate as the substrate. For convenient values along the y-axis, express v in units of μM/s.
c. Where have you seen a similar line pattern before? Why do AlaâLeu alkaline phosphatase and the earlier case give the same line pattern?
**Help I understand you all may not be able to respond to all parts but even answering one would really help me