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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.
Breakthrough in cancer detection or too much potential for false positives and For this question need your thought and concerns or if you have comments with referenced.
Explain the development of Anabaena heterocysts. Include the names of important structures and compounds.
A patient has swollen and painful submandibular lymph nodes. What might this indicate? What might be indicated if axillary nodes were swollen but not painful?
Albinism in humans is inherited as a simple recessive trait. For the following families, estimate the gentypes of the parents and offspring.
You require to treat cells with Arsenite such that it has a final concentration of 10uM once it has been added to the cells.
Discuss why is even weak selection still stronger than drift in very large populations at non-neutral loci?
Describe the structure and function of receptors involved in taste and olfaction. Describe how and why each of the following situations would affect someone's perception of flavor.
A white bison was born in a renchers herd. when it matured, the rancher mated it with a normal bison on three occasions, and each time a normally colored bison was born.
Determine what is the most common mechanism for repairing damage to DNA? Individuals with xeroderma pigmentosum inherit a faulty DNA repair mechanism.
Determine the realitive risk and odds ratios for a child's diagnosis of ADHD relative to exposure to lead paint, stratified by the father's diagnosis with and without ADHD.
A bar graph is used instead of a line graph because every type of liver cell was independent of the others. Determine what variable did researchers intentionally vary in experiment, and what are the units for this variable?
Discuss and define motor unit and describe how motor units function in recruitment and in maintaining muscle tone. Explain the different types of skeletal muscle fibers.
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