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antonio pedraza

antonio p.

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Chromatin bodies resembling sex chromatin are occasionally observed in tissues taken from males The statistical incidence of what appears to be sex chromatin in male cells normally ranges from about 2% in oral smears to as high as 20% in liver preparations. In fact, for an accurate determination of nuclear ser, a statistically significant number of cells must be examined and the percentage of cells having sex chromatin computed. For oral smears made from females, most investigators find that between 50% and 65% of the healthy cells demonstrate sex chromatin. Only normal-looking nuclei that stain evenly should be scored. Nuclei that are folded, have granulated nucleoplasm, oi demonstrate any sign of degeneration cannot be included in a critical study.1. Examine 50 squamous epithelial cells from a human female. How many exhibit sex chromatin?What percentage of these 50 cells reveal sex chromatin?2. What is the incidence of sex chromatin among 50 oral mucosal cells obtained from a human male?*3. Did you find any cells of the human female that appear to have more than one sex chromatin body?

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calculate the pH of a 2.0M NH3 / 0.2 M NH4Cl buffer after the addition of 15mL of 0.1M HCl to 65mL of the buffer

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Which of the following represents an indirect benefit that females may receive from mating with a given male? Group of answer choices The male will provide protection for the nest/eggs Preferred males will be less likely to pass on parasites to females That male will provide care for her young The female will have access to more territory The female’s offspring will be more attractive to mates

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Consider two tubes filled with water at the same height, one with freshwater and the other with saltwater. The pressure is greater at the bottom of the tube with: Important: Saltwater is more dense than freshwater.

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2. A sodium atom of mass 3.82 x 10$^{-26}$ kg vibrates with simple harmonic motion in a crystal. The potential energy increases by 0.0075 eV when the atom is displaced 0.014 from its equilibrium position. (a) Find the angular frequency, according to Newtonian mechanics. [3] (b) Find the spacing of adjacent energy levels in electron volts. [4] (c) If an atom emits a photon during a transition from one vibrational level to the next lower level, what is the wavelength of the emitted photon? [4] (d) In what region of electromagnetic spectrum does it lie? [1]

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Part A If the index of the prism is 1.54, find the maximum index that the liquid may have for the light to be totally reflected.

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AD5ition of filter aid to the slurry before filtration is done to _________ of the cake. Increase the porosity Increase the compressibility co-efficient Decrease the porosity Decrease the compressibility co-efficient

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(10 points) Given the following binary tree, show the results of traversal in various order. (a) Inorder traversal (b) Preorder traversal (c) Postorder traversal (d) Level order traversal

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A famous high-volume calculus text generates royalties beginning with $60,000 in the first year and declining each year by 40% of the previous year due to used sales and competition. The author is on a 4-year cycle of revision. Determine the present worth of one complete cycle of royalties if the author's time value of money is 7%. $

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Locate the centroid $y$ of the beam having the cross-sectional area shown.

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