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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?
once lodgepole pines are established the forest of yellowstone park will not change radically again.what is the term for the lodgepole pine community?
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Compare and contrast the processes of replication and transcription. Be sure o include in the discussion a comparison of the purpose of the processes, the templates used in each process, when each process occurs, and the initiation and termination..
The carboxyl group on the C-gamma carbon of glutamatic acid has a pka = 4.3. Determine the concentration of the various ionic species in a 0.01 M solution of glutamatic acid at pH = 5.
Which example is favored in terms of natural selection?
To determine the evolutionary relationship of 2 different animals, you can compare their DNA for similarities. Before there was DNA testing, how did we determine how closely 2 defferent organisms were related to each other?
Actin organization can be regulated by small GTPAses which stimulate actin binding proteins. Name one protein which could be stimulated to create branching structures.
1.how is the nervous system of the flatworm different from that of a human?2.describe the nonspecific defenses that
Think about a diploid organism that has four pairs of chromosomes. If no crossing over occurred, determine how many different gametes could be produced in this organism?
1.What process is defined as the net movement of water molecules from a low concentration of solute to a high concentration of solute?
What is the function of electron transport.
An organism has a diploid chromosome number of 12. How many chromatids will be visible during metaphase of mitosis? How many chromosomes will be visible at the end of anaphase in mitosis? For the similar organism, how many chromosomes will be present..
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