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You are studying a biochemical pathway in the bread mold NEUROSPORA crassa that is involved in the production of the compound C. You know that compounds A,B,D,E,F are required in this pathway, but you do not know the order in which they are synthesized. In order to study this, you isolate five auxotrophic strains that cannot synthesize compound C. Each of these strains has a single mutation affecting a single step of the pathway. From the following table infer the biochemical pathway and determine in which step each auxotroph has a mutaion. ("+" represents growth of the auxotroph on minimal meduim supplemented with the compund. ("-" represents no growth of the auxotroph on minimal meduim supplemented with the compound)
Mutants A B C D E F1 - - + - + -2 - + + + + +3 - + + - + -4 - - + - - -5 - + + - + +
Approximately half of our vitamin K is synthesized by bacteria in the colon. Based on this information, why might taking a broad spectrum antibiotic produce frequent nosebleeds.
In Staphylococcus epidermidis, bacillus subtilis and escherichia coli, which one has gram- positive, which one has gram-negative? Also, which organism is the biggest? Which one is the least.
Frank found himself in the midst of an ethical dilemma at work, and was using an ethical decision-making matrix, to address his work and personal values. Frank was most likely in which phase of the Ethical Decision-Making Framework.
Large folds in the stomach known ______ increase its surface area and also enable it to fold on itself when empty. The ______ is a valve that enables partially digested food out of stomach into the ______.
A cell whose cytoplasm has a concentration of 0.02 molar glucose is placed in a test tube of water containing 0.02 molar glucose. Assume that glucose is not actively transported into the cell, which terms describes the tonicity of an external solutio..
In metabolic processes of cell respiration and photosynthesis, prosthetic groups as in heme and iron-sulfur complexes are encountered. What do they do.
Suppose you are a geneticist and you're asked to examine the effects of a radiation leak that occurred at a facility in Iraq several years ago. How will you assess the level of mutations caused by this leak.
How denaturing a protein alters the functions of that protein. If we are bleeding by the accident, why the injury has to be deeper than epidermis.
Research protist parasites in the Genus Giardia. Scientists have proposed that these organisms represent the "missing link" between prokaryotes and eukaryotes. Explain the cellular structure of Giardia and describe how the cells are alike to typical ..
The resulting f1 generation consists of all tall pink flowered plants. Assume that height and flower colour is each determined by a single gene locus on different chromosomes; predict the results of an f1 cross of dihybrid plants. Select appropriate ..
The most significant probable cause of this temporary apnea is decreased activity of the what. what is the probability that the next child would be a girl.
What are some reasons for reestablishing wolves in Yellowstone National Park? What effects might the reintroduction of wolves have on the ecological communities in the region? What might be completed to mitigate the conflicts between ranchers and wol..
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