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15. At what stage of T cell development is the pre-TCRexpressed?A. Double negativeB. Double positiveC. Single positiveD. Pro-T cellE. None of the above16. In negative selection, cells that receive _____________ signalthrough their antigen receptors die.A. A weakB. A StrongC. An IntermediateD. No17. What happens to autoreactive cells that escape the thymus?A. They attack self tissues.B. They can be rendered anergic.C. They negatively regulate other autoreactive cells.D. They require TCR-ligation and costimulation to be activated.E. All of the above18. TREGs have been shown to be protective against which of the following conditions?A. Inflammatory Bowel DiseaseB. InfluenzaC. MalariaD. HIVE. MRSA 19. Ligation of Determine which of the following cell-surface receptors leads to cell death?A. TCRB. TLRC. FasD. Caspase 820. How long does B cell maturation from an HSC to a mature Bcell take?A. 1-2 HoursB. 1-2 daysC. 1-2 weeksD. 1-2 months21. This type of cell will leave the bone marrow and completematuration in the spleen.A. Common lymphoid progenitor cellB. Hematopoietic stem cellC. Immature B cellD. Pro-B cellE. Pro-T cell22. VDJ recombination occurs during which phase of a B cell'sdevelopment?A. Activated B cellB. Mature B cellC. Naive B cellD. Pro-B cellE. Immature B cell
Cut wings is an X chromosome recessive mutant of D melanogaster. Antennaless is an autosomal recessive mutant. A cut, antennaless female is mated to a wild-type male.
Ethanol is supplied in a 95 percent solution. You need 50mL of 70 percent Ethanol for your experiment. How would you make this solution?
Why do schools require inoculations for childhood diseases such as mumps, measles, and whooping cough? Why are the inoculations of value.
sketch a diagram of the circular DNA molecule, showing the locations of the restriction sites for Ecor I and BamH I , as well as distances between them.
Explain why is glycine often found in loops of protein rather than in secondary structures such as beta-sheets and alpha helices?
What is nonassociative learning and what are the differences between associative and nonassociative learning. In the small stream, you choose a rock and observe many small, flattened worms crawling on it are under surface. You decide that they belong..
Discuss how common are Coiled-coil motifs? Where are they found? Give two examples. Name four experimental techniques to determine protein protein interactions other than X-ray & NMR techniques.
It also makes an antidote molecule called brevenal that binds to sodium channels and protects them against the toxin. Brevenal may end up being a treatment for CF; in a sheep CF model, brevenal blocked bronchoconstriction and enhanced the clearance o..
Glucose oxidase is an enzyme that can be used for measurements of glucose levels by combining this reaction with an oxygen probe.
define What enzymes would be released to digest.
Propose a hypothesis to explain the current decline in Songbird numbers. Design an experiment that could test your hypothesis.
If a 100X solution is 1 M, what is the concentration of a 1X solution? Explain how you would prepare 100 mL of a 0.5 percent w/v agarose in 1X TAE buffer starting with a 20X TAE stock solution and solid agarose powder.
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