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10. Which of the following is an example of cross-presentation?A. An endogenous peptide being presented on MHC class IB. An exogenous peptide being presented on MHC class IC. An endogenous peptide being presented on MHC class IID. An exogenous peptide being presented on MHC class IIE. A B-cell antigen being presented to a T cell11. Hematopoietic stem cells cultured in the presence of which receptor differentiate into T cells rather than B cells?A. T cellsB. B cellsC. Notch-ligandD. CD312. Which of the following molecules would double-negative T cellsfail to express?A. CD3B. CD4C. MHC class ID. TAPE. All of the above13. At what stage of T cell development is the pre-TCRexpressed?A. Double negativeB. Double positiveC. Single positiveD. Pro-T cell14. What happens to autoreactive cells that escape the thymus?A. They attack self tissues.B. They can be rendered anergicC. They negatively regulate other autoreactive cellsD. They require TCR-ligation and costimulation to be activated.E. All of the above4. What happens to autoreactive cells that escape the thymus?A. They attack self tissues.B. They can be rendered anergicC. They negatively regulate other autoreactive cellsD. They require TCR-ligation and costimulation to be activated.E. All of the above15. 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 thefollowing conditions?A. Inflammatory Bowel DiseaseB. InfluenzaC. MalariaD. HIVE. MRSA 19. Ligation of which of the following cell-surface receptors leads tocell 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 cell
Chlamydias and rekettsias were once classified as viruses because of their small size and obligate intracellular growth requirement. What are some of techniques can be used to illustrate that they are really bacteria.
Place the following characters on a phylogeny of fungi (with animals as an outgroup), Flagella, Multicellularity, Non-motile sperm, Arbuscular mycorrhizae, Macroscopic reproductive structures.
Twenty g soil sample was added to 80 ml of water to make the final volume of 100 ml (tube A). Then, ten ml of the ‘tube A' solution was taken and added to 90 ml of water.
What strategies do other organisms have that allow them to live in environments that are hypertonic to their cytoplasm. What is the pattern in data from Seeley's field experiment.
Lack of iron in photic zone of the open ocean restricts the size of plankton populations. Iron is what kind of factor for marine plankton.
Mycoplasmas are the smallest living cells. They are spherical and have a diameter of about 0.33 μm (radius of mycoplasmas = 0.165 μm)a.
If the mutation is in mitochrondrial DNA, will the four haploid cells probably be all Pyr-, all Pyr+, or a combination? What if the mutation is in nuclear DNA. Why is mitochondrial function critical for growing on pyruvate.
A patient displays the enlargement of lateral and third ventricles, however no enlargement of fourth ventricle. Explain what do you conclude? At the time of a spinal tap of the patient, blood is discovered within the CSF. What does this finding pro..
make an experiment to test what happens (i.e. what is the final plasmid DNA content of cells in a transformed colony) if a competent cell is transformed with circular double-stranded plasmid DNA where there is a mis-match (e.g. a G-T base-pair ins..
A forty-four year old man is recovering from third degree burns over 50 percent of his body surface area. His serum potassium level is low (2.9 mEq/L). Heexhibits postural hypotension and skeletal muscle weakness.
A botanist takes a sample of 300 plants from a population and determines the genotype of each one for an esterase locus. The locus has two alleles segregating in the population
The cell has no cyclin B present, has mono-phosphorylated cdk1.Has no growth factor receptors on its surface. Cyclin B is present, spindle is present, chromatin is completed condensed
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