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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?
When chromatin from any eukaryote is digested with micrococcal nuclease and fractionated using electrophoresis, DNA fragments of approximately two hundred base pairs in length are observed.
q1. horn sporophytes are horn-shaped. horn possess gemmae. can undergo sexual reproduction. mosses what is the
When the experiment is repeated with a protein medium, the yeasts grow only in the presence of oxygen. Pasteur concluded that the yeasts can take oxygen from air, and in the absence of air, the yeasts take oxygen from sugar.
What would DNA footprinting reveal about the DNA binding sites of a normal Lac repressor protein? A normal RNA polymerase.
q1. environmental carcinogens mutagens and other environmental carcinogens uv light organic solvents high energy
The reproductive structures of plants have a lot in common with the repoductive structures of animals. In a 1-2 page essay, explain what flowers have in common with ovaries and testes
Amino acid analysis of a decapeptide provide the amino acide composition in no specific order Ser, Trp, Met, Gly, Phe, Cys, Ile, Arg.
Give one example of humans evolving over the past 10,000 years. Explain why and how evolution is take place?
While studying the Michaelis - Menton kinetics of enzymes in the TCA cycle, the synthetic hydrocarbon malonate was shown to act as a competitive inhibitor of one of the enzymes.
Investigate a disease that is caused by a chromosomal mutation. What is the type of mutation? What chromosome is affected? What are the consequences? (Minimum of 250 words)
Discuss about human genetic modification for traits other than to correct disease phenotypes such as eye or hair color,, athleticism, handedness
plating .1ml of a sample diluted by a factor of 10^-3 produced 43 colonies. what was the original concentration in the sample?
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