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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 physiological changes that occur in three different organ systems when food is ingested and how these systems coordinated a response in the human body.
define why a change in amino acid sequence might affect
You have been injected into the femoral vein? What is the path from the right femoral vein to the lower lobe of the right lung? What is the path that I would take from the right femorla vein to the lower lobe of the right lung via right pulmonary art..
In modern blimps, the gas of choice used to inflate them is helium rather than hydrogen. Hydrogen would be lighter, but helium is safer. Compare and contrast the atomic structure of hydrogen and helium.
Determine what biological function do methylases perform in bacteria? What adaptive value do they have for a bacterium?
If Penicillium typically secretes penicillin without disturbing the lichen relationship in which it is engaged, then what should have been true about its partner.
Suppose that H,I,J,K, and L represent alleles for the autosomal gene on different chromosomes. if a mating occurs between the individuals with the given genotypes: HHIiJjKKLI X HhIiJJkkLl
Assume your supervisor has found a new test kit that she wants to start using. She has asked you to validate the kit. Please explain some tests that might be needed?
Why were there complaints then about night-blindness, bone demineralization, and blood-clotting problems. If they have a large family, in what ways have to the colorblindness trait affect their children.
The seeds of orchids are among the smallest known, with virtually no endosperm and with miniscule seed leaves. As a result, what must one expect to be true of such seeds.
As exercise intensity increases, the respiratory system increases oxygen delivery to the body via the lungs by up to 10 to 20-fold.
As glucose is metabolized during respiration, a number of intermediate products are generated. Discuss how some of these intermediates are used to produce some of the essential biological molecules for the organism.
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