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Suppose that an enzyme uses a catalytic mechanism in which a functional group on the enzyme has to accept a proton from the intermediate formed in the first chemical step. The pKa of that basic functional group on the enzyme is 8.0, and is the only pKa apparent on a plot of kcat vs. pH for the activity of this enzyme. The kcat of the fully active form of the enzyme is 1 x 105 sec–1 .1. Calculate the fraction of the total enzyme active sites in solution that would be in the active form at pH 7.2.2. Calculate what kcat would be if the activity of the enzyme were measured at pH 7.2.
q1. in a cross between a purple flowered plant and a white flowered plant all 73 of the offspring had purple flowers.
Lack of iron in photic zone of the open ocean restricts the size of plankton populations. Iron is what kind of factor for marine plankton.
what are the risks and benefits of transgenic organisms in agriculture and in medicine?imagine that you are a biologist
Cortical cells in control wheat have a higher index of cell number than cortical cells in gamma-irradiated wheat; explain this finding in terms of cellular processes that may be taking place in the coleoptile.
Which parts of a eukaryotic gene are transcribed?
as fatty acids are absorbed through the intestinal lining for transport through the body, which of the following actions takes place?
what effect would each of the following have on synaptic transmission? a administering a drug which inactivates
q1. michael lynch and john conery showed that there is a strong negative correlation between nemu and genome size. how
Why is eating "lower on the food chain" - in other words eating plants instead of animals - more efficient? Why is energy transfer along the food chain inefficient. Explain. Give examples.
Discuss the process of natural selection as defined by Darwin. How did Darwin's theories differ from his predecessors? In your opinion, have his theories proved to be correct? Why and why not?
In some species, insertion of transgenes is impossible at this time. Researchers often attempt to reduce the activity of a single gene by feeding the organism 25 nucleotide RNAs. Explain how this affects the activity of a single gene. (3 mechan..
Describe how the presence of a higher or lower concentration of atmospheric carbon dioxide would impact the evolution of stomata density in plants?
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