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A biologist was testing E. coli for thymidine requirement. She found a thy- point mutant and wanted to study reversion to thy+. She grew 20 cultures of the thy- mutant strain and plated them onto 20 plates that contained media to select for thy+ revertants. She obtained a total of 460 colonies. Six of the plates showed no colonies.a) If 5 x 108 cells were spread on each plate what was the reversion frequency and the reversion rate? b) Explain what steps she could have taken to find the thy- mutant in the first place, and why she did each step.c) She also wanted to study the type of mutation that occurred during formation of the original thy- cells. The mutagens HA (a base modifyer), BU (a base analogue), and acridine (an intercalator) were each added to thy- cells. Only BU reverted the thy- mutants to WT. Briefly describe the types of mutations each mutagen causes. Based on this information what was the original mutation to thy- to begin with? Explain your reasoning.
Explain the nursing care and patient teaching for the patient with a postpartum infection? What will the WBC rise to in case of a postpartum infection?
Suppose that Mendel looked simultaneously at four traits of his pea plants. If he crossed a homozygous dominant plant with a homozygous recessive plant.
The symbol + indicates that wild-type recombination occurs, and - indicates that wild types are not formed. Use the data to construct genetic map of the order of point mutations, and indicate the segment deleted by each deletion mutation.
A flower breeder analyzed that a cross between true-breeding red tulips and true-breeding white tulips makes all red-flowering F1 offspring.
What series of nucleotide pairs in a Drosophila gene will encode the amino acid sequence met-trp-phe-trp-met (reading from the amino terminus to the carboxyl terminus).
List and explain at least three cellular features of bacteria that might be targeted to inhibit or kill a bacterial pathogen.
Assume you remove your test cultures from the incubator and notice that one of them- a know fermenter- has a gas bubble in the Durham tube.
What is the difference between diets that are specifically designed for diabetics and diets for normal people?
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.
The degree of interactive genetic variation underlying any trait can be affected by the genetic background of the population. What does this mean? Explain one evolutionary consequence of the effects of genetic background on alleles at interacting ..
A true breeding tall pea plant with axially positioned purple flowers was crossed to a true breeding dwarf pea plant with terminally positioned white flowers.
Briefly describe three specific aspects of transpiration and phloem transport that involve active transport of molecules.
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