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You have a solution that is a mixture of two compounds, A and B. The molar extiniction coefficient of substance A at 260 nm and 280 nm is 5248 and 3150 respectively. Compound B has a molar extinction coefficent of 311 and 250 at 260 nm and 280 nm respectively. you determine that the solution has an absorbance of 0.83 and 260 nm and 0.67 at 280 nm. Can the individual concentrations of A and B be calculated from these data? If so wat are the concentrations of each compound in the solution?
A Drosophila experiment analyzing linkage of X-linked genes studied a recessive eye mutation, a recessive wing-vein mutation, and a recessive bristle mutation
Explain the transport properties of the loop of Henle and describe the interactions between the ascending and descending limbs in the countercurrent multiplier system
Phosphonylation, a chemical surface treatment, has been proposed as a means of increasing the hydrophilicity of LDPE, and therefore increase its lubricity and reduce vascular tissue damage.
A student with Strep throat is given a prescription for an antibiotic and is told to take the drug for two weeks. After a week, the student feels better and stops taking the drug.
Respiration rate at 10 degree Celsius is 10 mg/hr, and the rate at 20 degree Celsius is 20 mg/hr. What is the Q10? Given this Q10, what would the rate be at 30 degree Celsius?
Suppose you have a set of four Hfr strains and you carry out a series of crosses with a multiply marked recipient that is auxotrophic for many different nutritional markers.
Polio and HIV are both +ssRNA viruses have very different strategies for replicating their genomes. After the viral genomes enter the cell, explain the first step involved in replication of each genome.
A 2-amino-purine can be incorporated into DNA in place of adenine. It can pair equally well with thymine or cytosine. What type of mutation do you expect it to cause.
Explain why is agar typically used as a solidifying agent in microbiological media instead of gelatin? What could happen if gelatin was used?
If you obtain 90 colonies after spread plating 1 ml of a 1:100 dilution of lake water, what is the concentration of bacteria in the lake water?
A 2.5 mg/ml stock solution was diluted as described in the table below and then the absorbance of each dilution was estimated and presented in the table given below.
A man makes 0 units of an enzyme due to homozygous recessive genes on chromosome 21. His wife makes 100 units of the enzyme due to a heterozygous pair of genes on chromosome 21. They have a son with trisomy 21 who makes 200 units of the enzyme.
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