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When a population of cells is examined with a microscope, thepercentage of the cells in the M phase is called the mitotic index. The greater the proportion ofcells that are dividing, the higher the mitotic index. In a particular study, cells from a cell cultureare spread on a slide, preserved and stained, and then inspected in the microscope. A hundred cellsare examined: 9 cells are in prophase; 5 cells are in metaphase; 2 cells are in anaphase; 4cells are in telophase; the remainder, 80 cells, are in interphase. Answer the followingquestions:a. What is the mitotic index for this cell culture?b. The average duration for the cell cycle in this culture is knownto be 20 hours. What is the duration of interphase? Of metaphase?c. Going back to the living culture of these cells, the averagequantity of DNA per cell is measured. Of the cells in interphase, 50% contain 10 ng (1nanogram = 10-9 g) of DNA per cell; 20% contain 20 ng DNA per cell; theremaining 30% of the interphase cells have amounts of DNA between 10 and 20 ng.Based on these data, determine the duration of the G1, S, and G2 portions ofthe cell cycle.
Discuss the regulation, phosphorylation, and activity of glycogen phosphorylase and glycogen synthase in terms of insulin and glucagon. What are the differences between glycogenolysis in the liver and in the muscle?
Describe the hemolysis produced by alpha-hemolytic, beta-hemolytic, and nonhemolytic streptococci.
The foregut is the region that begins the digestive process by transforming large food chunks into a smaller chunky soup. The human stomach is a muscular sack of glands that secretes proteases and HCl.
Reach capabilities in the sagittal plane can be determined graphically using anthropometric data as shown in the figure on the given page.
Explain in detail why different cell types might or or not respond to a certain signaling molecule; and, why some cells respond to the same signal but with different outcomes. Give and explain specific examples.
Test the given hypothesis of the secondary exposure to cigarette smoking during childhood has importance in developing the lung cancer in person.Describe how efficient is surgical treatment for the Ankylosing Spondylitis.
If the preclinical prevalence of breast cancer increased in the screened population would you expect the positive predictive value to increase, decrease or remain unaltered? Why?
does the agar have an antibiotic beyond the zone of inhibition? how does your answer tie in with MIC?
are there medications that can either stimulate or inhibit the branches of the autonomic nervous system? when would
During the Calvin-Benson cycle, in the red Columbine plant, high-energy electrons are transferred into a newly made three carbon compound.
How do plant and animal cells metabolize energy in complementary ways? What does this suggest about the flow of energy and the recycling of elements through living organisms? Could we think of any other similar relationships.
the family enterobacteriaceae contains some organisms living in the intestines without harming the host and some
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