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A 20 years old man from Africa is evaluated for persistent cough, night sweats, low-grade fever, and general malaise. A chest x-ray revels finding consistent with a ghon complex. Sputum cultures grow acid-fast bacilli. Examination of the hilar lymph nodes in this patients would most likely demonstrate which of the following pathologic changes.
a. caseous necrosis
b. coagulative necrosis
c. fat necrosis
d. fibrinoid necrosis
f. liquefactive necrosis
Consider a mitochondrion with a pH in the matrix = 8 and the pH of the intermembrane space = 5.9. The matrix is 100 mV more negative than the IMS or cytoplasm.
What are the typical features of mammals - What are the three major groups into which mammals are divided?
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.
a. What is the phenotypic ratio expected for this testcross? b. Do the observed results fit with the hypothesis you have proposed in part "a" above?
Describe the relationship between the terms DNA, gene, chromosome, allele, polypeptide, and protein. Why do you think scientists at one time thought the genetic material might have been protein? What is Mendelian inheritance
What are the risks and benefits of cloning? What are some potential uses for cloning? Could you envision using cloning technology in your own life? If so, how? What are some of the ethical problems with cloning?
Calculate the equilibrium frequencies of the A, B, and O alleles in a population with the following phenotype frequency distributions: A=100, B=260, AB=130, O=540 Then estimate the expected proportion of individuals with the A and B phenotypes that a..
Why is there a reaction on the urease agar/broth, although there may be no significant growth? (urease test)
A threefold increase in new narcolepsy cases in Beijing
High Performance boat manufactures know that bacteria cancollect on a boat, ruining the boat's hydrodynamic properties .Periodic cleaning of the boat's surface and repainting eventualyruin that surface and do not solve the problem
Describe sensory adaptation and then give one example of a case in which one might interpret this to be an advantage and one that could be considered.
Describe three different joints found within the vertebrae, including the bone markings of each bone and the movements produced by those joints.
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