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Suppose you innoculate a PR broth with a slow-growing fermenter. After 48 hours, you see slight turbidity but score it as (-/-). Is this result a false positive or a false negative? Is this a result of roor specificity or poor sensitivity of the test system?
Early formulations of this medium used a smaller amount of carbohydrate and occasionally prodused false alkaline (pink) result after 48 hours. Why do you think this happened? List at least two steps, as a microbiologist, that you could take to prevent the problem.
What is nonassociative learning and what are the differences between associative and nonassociative learning. In the small stream, you choose a rock and observe many small, flattened worms crawling on it are under surface. You decide that they belong..
Describe the process of muscle contraction and how a neuromuscular blocking agent, as in metubine, would interfere with muscle contraction.
Construct the nuclear genome content of a 2n=4 organism at G1 and at metaphase, showing each chromosome and sister chromatid as a single vertical line.
Normal cells greatly slow their rates of cell division after filling culture dish with layer that is one cell deep. If a circular group of cells is removed from the middle of the filled culture dish.
Critically discuss three of the test systems used to study the effects of a toxicant on chromosomes, describe each test system, and discuss one advantage or disadvantage of that particular test system.
Hershey and Chase experimented with radioactively labeled phosphorus and sulfur to determine that DNA and not protein is the genetic material.
Explain some new approaches to chemotherapeutic control that works to decrease the incidence of bacterial resistance and discuss some aspects of an Ideal Drug?
Assume you have found a new Xenopus gene that codes for a RNA binding protein. You are not sure what its function is but you are interested in finding out as much as you can.
Rifamycin and actinomycin D are two antibiotics derived from bacterium Streptomyces. Rifamycin binds to b subunit of E. coli RNA polymerase and interferes with formation of the first phosphodiester bond in the RNA chain.
List two types of macromolecules that have been partially digested by the time acid chime moves into the intestine. Where did the digestion take place, and what enzymes were involved.
Swelling of the abdomen and legs due to edema is characteristic of starving children with kwashiorkor, protein-deficiency disorder. What is the relationship between this symptom and procedure of capillary exchange.
Atoms can be represented by simply listing the number of protons, neutrons, and electrons-for example, 2 p+; 2 n0; 2 e- for helium. Which atom represents the 18O isotope of oxygen.
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