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 […]

1. What does it mean to say that the Soil Taxonomy is a generic system of classification? 2. Describe and explain the soil horizon development of Entisols. 3. In which kind of climate are Gelisols typically found? 4. In what kind of environment are Aridisols typically found? 5. What is […]

1. a. A standard solution of a protein containing 0.400 mg/ml had an absorbance of 0.312 at 280 nm. The pathlength of the cuvette is 1 cm (b= 1 cm). Calculate the extinction coefficient (mg-1 * cm-1 * mL) of the standard protein and write your final answer in the […]

Once two populations of a species have become allopatric with some barrier preventing gene flow between them, the two populations are free to diverge genetically. One mechanism for divergence that is thought to result in rapid divergence is sexual selection. a. Why is sexual selection likely to result in more […]