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It is common in laboratories to make concentrated "stock solutions" that may be used to prepare "working solutions" of any desired concentration. You are asked to dilute a stock of NaCl with a concentration of 0.5M.
a) Develop a dilution scheme to show how you might prepare 250 mL of a solution of 20mM NaCl from the stock solution.
b) Draw a dilution scheme to show how you might prepare 100mL of a solution of 10mM NaCl from the stock solution.
c) Draw a dilution scheme to show how you might prepare 200mL of a solution of 0.1mM NaCl from the stock solution.
How may you use site-directed mutagenesis to determine whether this residue is essential for proton conduction?
Researchers want to identify the impact of cholesterol on the development of heart disease. They follow individuals who are vegan, and meat-eaters for ten years and they record if any of them experience a heart attack.
An experimental population is started with a recessive deleterious allele (m) at a high frequency (p). The wild type homozygote (+/+) and heterozygote (+/m) have equal fitnesses.
You observe the following numbers of individuals of each genotype in a population, Determine the observed genotype frequencies in this populaiton?
Describe the difference between the ionic and covalent bonds. Describe the functions of the three specialized tissues in plants.
Briefly explain why this mating produces a triploid individual. Why can mitosis proceed normally in triploid cells, but meiosis cannot.
While the nurse applies the sharp point of the pin on his arm several times, he is only able to identify these as one "very sharp prick." What would be the most correct explanation for this.
An optional technique of performing the catalase test exist where hydrogen peroxide is dropped directly into a colony growing on an agar plate.
Why is the gene coding for ribosomal RNA (rRNA) used for establish phylogenetic relationships and how does this compare to previous methods for placing organisms in appropriate taxa.
How would you interpret this result? How might such a phage replicate its DNA.make sense in terms of Chargaff's rules.
Assume your patient is receiving NPH insulin in the morning and evening The 5 p.m. insulin check is high and is to be treated with regular insulin.
A particular species of mouse feeds on the seeds of a single species of cherry tree. When the mice eat a seed, they digest it completely.
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