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In a generalized transduction experiment, phages are collected from an E. coli donor strain of genotype cys+ leu+ thr+ and used to transduce a recipient of genotype cys- leu- thr-. Initially the treated recipient populations placed on a minimsl medium with leucine and threonine. Many colonies are obtained.
a) What are possible genotypes of these colonies?b) Strains from theses colonies are then inoculated onto 3 different media. (1) minimal plus threonine only. (2) minimal plus leucine only, and (3) minimial. What genotypes could in theory grow on these 3 media?c) It is observed that 56% of the original colonoes grow on (1), 5% grow on (2) and no colonies grow on (3). What are the actual genotypes of the colonies on (1),(2) and (3)?d) Draw a map showing the order of the 3 genes and which of the 2 outer genes is closer to the middle.
If repressor tetramer uses only two of its subunits to bind to an operator sequence, why is tetramer formation so important to the control of lac operon gene expression.
Currently, three fossil skulls of Homo sapiens, dating to about 160,000 years BP, were discovered in eastern Africa. These skulls fill a gap between the 100,000 year old H. sapiens.
As a result of single intake of 6.3x10^3 Bq of a radionuclide, a particular organ will receive doses of the 0.2 mGy from a low energy beta particles and 0.05 mGy from the alpha particles during next 50 y.
the required reagents involved in making the PCR work.
The HIV virion is a sphere that is roughly 140 nm in diameter. Determine hat particular kind of microscope is needed to visualize HIV virion
Read over the description of the Human Inherited Traits in the Week 6 Experiment instructions in our course and complete the table given below.
Suppose that you discover a new plant species that seems to survive under a wide variety of environmental conditions. Explain an effective, but low budget approach to discern.
Victoria is a fifty-two year old, recreationally active female who comes to you after just having been diagnosed with multiple sclerosis, an autoimmune disease.
A snapdragon with pink petals, black anthers and long stems was allowed to self-fertilize. From the resulting seeds, 650 adult plants were obtained.
Determine which of the following is examples of disruptive selection and which of the following describes balancing selection.
Discuss how would an increased number of Na+ leak channels in the membranes affect the sign and magnitude of the RMP? Justify your answer.
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.
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