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A population of T cells has been stimulated to proliferate in response to a particular antigen. A sample of 1000 cells is examined microscopically, revealing that 200 of these cells are in the various stages of mitosis. Of the remaining 800 in interphase, 400 have x amount of DNA, 250 have 2x, and the remaining 150 have amounts somewhere between x and 2x. Additional analysis reveals that the G2 phase of the cell cycle lasts 2 hours. What is the total length of the cell cycle?
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.
Humans are parts of food chains and food webs, too. Where on a food web would you typically find humans (near the bottom with the producers, at the top with carnivores, or somewhere in between)?
As a 1st step towards cloning the ding-dong gene from Drosophila, you find a transposon insertion within the gene.
Using principles of community ecology, propose a hypothesis to explain the results and outline her methods and science processes (as in dependent variable, independent variable, controls, constants) as used in the experiment. What extra evidence woul..
Discuss the five main types of histone proteins, and describe what role each of them plays in the nucleosome. Based on what you know about them,
What does this show about the relation between voluntary and involuntary reflex movement. If the bacteriorhodopsin molecules were randomly oriented, would you expect ATP to be synthesized? Give details about the answers.
in what direction does polymerization of RNA occur.
A male volunteer named Conan was passively sensitized with IgE specific for Der f 1. After an intradermal challenge with Der f 1, Conan show a typical skin lesion due to an immediate hypersensitivity reaction.
Use the genetic code table, translate your mRNA sequence into amino acid. if any of the mRNA codns are start or stop.
Assume your text provides an interesting explanation for the "dormitory effect", in which women living or sometimes working together tend to synchronize their menstrual cycles.
What are the most probable genotypes of the male and female parents? Give details the strategy used to determine the genotypes. What is the probability of the subsequently offspring having a spotted brown tail.
Explain the study of hypothesis? Specify the outcome variables and also state how they were measured? Explain the study factors (exposures) and how were they measured?
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