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Steven is a 10-year-old white male seeking medical attention because of possible physical abuse observed by his gym teacher. The teacher noticed severe bruising over much of his upper body when his shirt "rode up" during an exercise. Steven emphatically states that he has never been abused by anyone. He denies any accidents and didn't tell anyone about his bruises because he thought they might "get me into trouble." His mother cannot explain the bruises either and did not see them before today because her son does all of his own hygiene and is quite modest about revealing his body even to family members. Steven's physical examination is benign except for multiple, irregular dark purple bruises over most of his torso and lower extremities. His complete blood count is well within normal limits except for a low platelet count of 18,000/mm3. What is Steven's diagnosis?
how such a mutation might alter the expression of a gene.
In a donor population, the allele frequencies for the normal and the sickle-cell allele are 0.9 and 0.1 respectively. A group of 55 individuals migrates to population containing 10,000 individuals.
evaluate and contrast the electron transport systems. Include a discussion of the inputs and outputs of each ETS and also give examples of specific electron carriers.
Define heritability and explain the difference between saying a trait is heritable and saying it's genetically determined. Why is heritability very low for many traits that are important to survival and reproduction?
find out in which step each auxotroph has a mutaion. ("+" represents growth of the auxotroph on minimal meduim supplemented with the compund. ("-" represents no growth of the auxotroph on minimal meduim supplemented with the compound)
Why do you think the clearing in a positive CAMP test is an arrowhead shape and not some other shape? Would it likely make an important difference if you began streak II near S. aureus and streaked across the plate in the other direction? Why?
Assume that a mutation occurs in an intron of a gene encoding a protein. What would the most probable effect of the mutation be on the amino acid sequence of that protein.
Assume you ingest 20 cells of Salmonella typhimurium in a chicken taco. Some of the bacteria are killed as they pass through the stomach but ten viable cells survive and reach the intestine.
Describe the two types of RNA editing, outlining the different steps involved. Which type of editing involves the most significant changes in the mRNA sequence?
Explain why population growth in the human population does not seem to be affected by limiting factors.
How would you determine the termination codon appear in the mRNA for this gene? Write the sequence with the 5' and 3' ends of the sequence indicate clearly.
How does the total number of replication origins in bacterial cells compare with the number of origins in human cells?
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