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In Beadle and Tatum's study of Neurospora , they were able to identify three classes of arginine auxotrophs, mutants that needed arginine added to minimal media in order to grow. The pathway in the production of arginine includes the following steps: precursor ornithine citrulline arginine. What nutrient(s) had to be added to the minimal medium in order for the class of mutant with a defective enzyme for the precursor ornithine step to grow?
citrulline onlyprecursor onlyprecursor, ornithine, and citrullineornithine or citrulline
A 2M NaCl solution and a 2 M glucose solution are separated by a semi-permeable membrane,permeable to water but not the solutes. Assuming each chamber is a cell of finite boundaries, describe the relative osmolalities and tonicities present in the..
Assume that a certain bacterial chromosome has one origin of replication. Under some conditions of rapid cell division, replication could start again from the orgin before the preceding replication cycle is complete.
What experiment could be performed to ascertain if an antimicrobial agent is bactericidal or bacteriostatic? Can a bacteriostatic agent become bactericidal in the long run or vice versa? Why?
Most transcription factors must form dimers to function. How can homodimerization and heterodimerization explain how a transcription factor can both activate and repress transcription.
explain the feedback mechanism that maintain homeostasis and give two specific examples of what happen when homeostatic control systems do not function properly.
Reach capabilities in the sagittal plane can be determined graphically using anthropometric data as shown in the figure on the given page.
Three dominant traits of corn seedlings, tunicate seed, glossy appearance, and liguled stem, are studied along with their recessive counterparts, nontunicate.
A geneticist determines that long hair length in mink is dominant over short hair (recessive).define how his geneticist friend should advise.
What would be TRC for a male with the genotype AABbCcDD? For a female. In contrast, each dominant allele in an individual's genotype contributes 12 ridges to the TRC in males and 10 ridges to the TRC in females.
Why would someone use a split ratio as opposed to making a cell count? What is the major drawback to performing a split ratio?
1. How many total base pairs are in all the mammalian genes? 2. What proportion (%) of the total genome does this represent? 3. What is the probability that a random mutation will occur in any given gene?
In a population where only the total number of individuals with the dominant phenotype is known, how can you calculate the percentage of carriers and homozygous recessives?
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