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1. Normal cells greatly slow their rates of cell division after filling a culture dish with a layer one cell deep (a monolayer). If a circular group of cells is removed from the middle of the filled culture dish, the cells on the edges of the "wound" will begin to divide, fill the space and then stop dividing again. How does the behavior of transformed cells differ? 2. You look at two slides in the microscope. The first contains cells displaying nuclear irregularity and a scant and disorganized cytoskeleton. The second contains cells with a normal chromosomal number and a well-organized network of microtubules, microfilaments and intermediate filaments. Which, if any, contains cancer cells? Explain your selection. 3. You grow some cells in culture and measure their growth rate. You then add serum with growth factors in it to the culture medium and once again measure the growth rate. The growth rate increases only slightly. What kind of cells are these likely to be and why do you think so?
Inversions are known to affect crossing over. The following homologs have the indicated gene order (the filled and open circles are homologous centromeres): filled ABCDE open ADCBE.
q1. a cross between two inbred plants that had mean seed weights of 20 and 40 grams respectively produced an f1
1 to what kingdom would a single-celled nucleated photosynthetic organism belong? 2 what clues indicate that dogs are
Explain why type AB+ blood may be called the "universal recipient" for blood transfusions. Explain why this would not be true if the transfusion required 6 units (about 3 liters) of blood.
case studygigantism is abnormally large growth during childhood caused by excess growth hormone secreted by the
What structures/organelles are common to plant cells? Why does acetone and methanol cause leakage of betacyanin from beet cells? Think about polarity vs. nonpolarity.
where on your body would you expect xerotolerant normal flora to be found? explain. would these microbes also be
Ed Rivers, a 3rd year medical student, was alone in the hospital ER one night. It was unusually quiet that night, and the resident was getting some much needed sleep.
Cells often control water content by pumping solutes back and forth across the cell membrane. Why would this work, include term osmolality.
What binds in the "oxyanion hole" during chymotrypsin catalysis?
Using the Enterotube II system and the interpretation guide, explain why don't you poke a hole into the plastic covering the glucose compartment? Explain. What does it mean if the wax pulls away from the agar?
You have a 2 kb plasmid, and you want to insert a gene that gives ampicillin resistance that is 500 bp insize, What would the total size of the plasmid be following the insertions
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