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A number of bacterial biosynthetic operons have been examined in Escherichia coli and Salmonella typhimurium, many of which show attenuation very similar to that seen in the tryptophan system in E. coli. Below are partial amino acid sequences of leader peptides. For each, predict the amino acid that is likely to be synthesized by the operon for each attenuator element. Explain your reasoning. For leader peptide C, how would changing the histidine codons to alanine codons effect the regulation of the operon?
A. Met-Ser-His-Ile-Val-Arg-Phe-Thr-Gly-Leu-Leu-Leu-Leu-Asn-Ala-Phe-Ile-Val-Arg---B. Met-Lys-Arg-Ile-Ser-Thr-Thr-Ile-Thr-Thr-Thr-Ile-Thr-Ile-Thr-Thr-Gly-Asn-Gly-Ala---C. Met-Thr-Arg-Val-Gln-Phe-Lys-His-His-His-His-His-His-His-Pro-Asp---D. Met-Lys-His-Ile-Pro-Phe-Phe-Phe-Ala-Phe-Phe-Phe-Thr-Phe-Pro---
A groom's sister has CF, an autosomal recessive disease, though he himself does not have nor do either of his parents. He is marrying a woman with no family history of CF.
The wider orrcurence of glycolysis in nearly all organisms, both aerboic and anaerobic, indicates that it is one of the most ancient metabolic pathways.
Activation of metabotropic glutamate receptors in neurons is often coupled to the activation of phospolipase C PLC.
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A young man was brought to the hospital suffering an unknown disease. Unfortunately, the young patient did not make it. Upon examination of his liver cells it was determined that the liver cells were extremely unhealthy.
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Which of the following is NOT a cis-acting sequence.
provide an explanation of how bacterial species are defined. clearly state how the concept of a bacterial species differs from that of the biological species concept used with animals and plants.
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Sketch a diagram that illustrates how you would expect the triglyceride and phospholipid molecules to interact with the water. Be sure to indicate structures, if any that might form as a result of these interactions.
Assume if heritability of male tail length in a bird was known to be 0.5, and female birds impose a selection differential of five cm on male tail length because they are too much attracted to long tails.
In an aqueous solution, virtually all D-Glucose molecules (>99%) are in pyranose form. Other aldoses have a greater proportion of molecules in the open chain form.
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