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Cytokinesis-the actual process of cell division-has attracted theorists for well over 100 years. It has been said that all possible explanations of cytokinesis have been proposed; the problem is to decide which one is correct.Consider the following three hypotheses:1. Chromosome signaling: When chromosomes split at anaphase, they emit a signal to the nearby cell surface to initiatefurrowing.2. Polar relaxation: Asters relax the tension in the region of the cell surface nearest the spindle poles (the polar region),allowing the region of the membrane farthest from the poles (the equatorial plane) to contract and initiate furrowing.3. Aster stimulation: The asters stimulate contraction in the region of the cell surface where oppositely oriented spindle fibersoverlap (that is, the equatorial region), thereby initiating furrowing.These hypotheses have been tested in a number of ways, One particularly informative experiment involved pressing a glass ballonto the center of a dividing sand dollar egg so as to deform it into a torus (donut shape). As illustrated in Figure 17-35, the eggdivided into a single sausage-shaped cell at the first division; at the second division, it divided into four cells.A. What does the chromosome-signaling hypothesis predict for the result of this experiment? Do the predictions match the experimental observations?B. What does the polar-relaxation hypothesis predict for the experimental out-come? Do the predictions match the experimental observations?
C. What does the aster-stimulation hypothesis predict? Do the predictions match the experimental observations?
q1. a unit of area often used in measuring land areas is the hectare defined as 104 m2. an open-pit coal mine consumes
q. do all the probable monohybrid crosses for the abo blood group and give the genotype and phenotype ratios following
What does the most recent Helsinki Declaration include that is not included in the Nuremberg Code?
Your doctor prescribes a drug that should be taken orally. You don't like swallowing big pills, so in the place you crush the pill into a fine powder, dissolve it in saline, and inject it into a vein in your arm. Why is this really bad idea.
An enzyme that follows Michaelis-Menten kinetics has a Km of 1 ?M. The initial velocity is 0.1 ?M min -1 at a substrate concentration of 100 ?M. What is the initial velocity when [S] is equal to 2 mM?
q1. what is the good range for a heartbeat stroke work in an anaesthetised sheep? before and after the venous
Why is it important to study genetics of an isolated species on an island, like the wolves on Isle Royale?
explain your position on national health care spending in the united states. include information on the followinga the
Unbuffered or weakly buffered basic solutions slowly become more acidic with time, unless they are stored in tightly sealed containers. Explain.
q1. some birds follow moving swarms of army ants in the tropics. as the ants march along the forest floor hunting
Two dominant alleles in mice both affect the appearance of the tail. Shorty (S) produces mice with short tails and hairy produces mice with hairy tails.
What do the sex determination systems of Chlamydomonas and Cannabis have in common? What is different? Answer in 4-5 sentences.
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