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List the tissues found in a segment of a three year old stem starting from the outside and moving to its center. Include both primary and secondary xylem/phloem, pith, cortex, vascular and cork cambiums, epidermis, periderm. Explain how "ray (parenchyma) cells" are formed through these tissues.
describe in a one paragraph. Contrast the functions of the pulmonary vs. the systemic circuits.
Describe the developmental program of a T cell, including positive and negative selection and changes in phenotypic markers
While the nurse applies the sharp point of the pin on his arm several times, he is only able to identify these as one "very sharp prick." What would be the most correct explanation for this.
A positive intreger is scalled a perfect number if it is equal to sum of all of it is positive divisons, excluding itself. For example, six is 1st perfect number, because 6=3+2+1.
Describe the development of a T-dependent immune response. Include details of B cells, T cells, and all relevant cytokines.
choose two organisms from two different trophic levels in the marine ecosystem and explain the impact of the algal bloom on their ecology.
why the sequences are read in different reading frames.
Compare the skull of each of the following vertebrates, Sarcopterygians, Labyrinthodont amphibians, Snake and Therapsida. You should include similarities and differences in the neurocranium.
Gennie is wild type. Below is a segment of her DNA. The top strand is the coding region, and the reading frame begins with the first codon that codes for met
Describe a microarray and how it works? Indicate what is fixed to a support and what is used to probe the microarray. How does a microarray differ from a Northern blot.
Describe how HIV is able to utilize host cell DNA machinery to replicate itself and ultimately infect new cells. In your discussion be sure to mention reverse transcriptase and the role of surface glycoproteins.
Although the primary transcript of a gene may be identical in two different cell types, the translated mRNAs can be quite different.
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