The Discovery of cdc2 as the key regulator of the cell cycle by Paul Nurse 3. When Paul Nurse did his own cdc screen in fission yeast, why was he more attracted to the wee mutants than to any of the other mutants? Why were smaller cells more interesting to him than arrested, or bigger celled mutants? 4. How did the Nurse lab people show that humans had a cdc homologue?

The Discovery of cdc2 as the key regulator of the cell cycle by Paul Nurse 3. When Paul Nurse did his own cdc screen in fission yeast, why was he more attracted to the wee mutants than to any of the other mutants? Why were smaller cells more interesting to him than arrested, or bigger celled mutants? 4. How did the Nurse lab people show that humans had a cdc homologue?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter10: Cell Reproduction

Section: Chapter Questions

Problem 39CTQ: Rb is a negative regulator that blocks the cell cycle at the G1 checkpoint until the cell achieves a...

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The reason to consider the statement "many human cell-cycles genes from human cells function perfectly well when expressed in yeast cells" as remarkable.
Figure 28.11 depicts the eukaryotic cell cycle. Many cell types â€œexitâ€� the cell cycle and donâ€™t divide for prolonged periods, a state termedG0; some, for example neurons, never divide again. a. In what stage of the cell cycle do you suppose a cell might be when it exits the cell cycle and enters G0? b. The cell cycle is controlled by checkpoints, cyclins, and CDKs. Describe how biochemical events involving cyclins and CDKs might control passage of a dividing cell through the cell cycle.
Biologists have long been interested in the effects of radiation on cells. In one experiment, researchers examined the effect of radium on mitosis of chick embryo cells growing in culture. A population of experimental cells was examined under the microscope for the number of cells in telophase (as a measure of mitosis occurring) before, during, and after exposure to radium. The results are shown in the Figure. What is the effect of radium exposure on mitosis? Source: R. G. Canti and M. Donaldson. 1926. The effect of radium on mitosis in vitro. Proceedings of the Royal Society of London, Series B, Containing Papers of a Biological Character 100:413419.
a micrograph of chromosomes from a normalhuman cell. If you created this kind of image using a cell from aperson with Down syndrome, what would you expect to see?
State TWO ways in which cell division results in cell C being genetically different from one another. (this question going with the first question I forget to send this morning) The graph in Figure 2 shows the effect of light on the period of oestrus in two groups of female sheep. The females in the control group were subjected to the normal seasonal variation in day length. Partially through the first year of the experiment, sheep in the experimental group were subjected to reversed day-length cycle. The period of oestrus of each group of sheep is shown in solid bands above the graph (Figure 2). Using information from the graph in Figure 2, answer the following questions: i) During what months does oestrus occur in each group? ii) Give ONE advantage of this pattern of oestrus to the sheep in the control group. Explain your answer. iii) What information can be deduced from this experiment.
If a mad scientist hands you a cell culture with 100 cells that just entered g1. He needs to extract the MOST possible DNA from 100 cells. On top of that, he requires that the DNA cannot be condensed. To accomplish this goal he gives you a set of chemicals that will stop a cell in any part of the cell cycle you want. What part of the cell cycle would you stop the cell at, that matches those requirements?
Animal and plant cell prophase similarity? Animal and plant cell Metaphase similarity? Animal and plant cell Anaphase similarity? Animal and plant cell Telophase similarity? 1. Explain why we used these particular cells to map the phases of mitosis (Whitefish blastula and Onion Root Tip). Why do these cells best demonstrate the phases of mitosis?
Cytokinesis in Plant Cells
Which statements are true? Explain why or why not.1 Since there are about 1013 cells in an adult human,and about 1010 cells die and are replaced each day, webecome new people every three years.2 In order for proliferating cells to maintain a rela-tively constant size, the length of the cell cycle must matchthe time it takes for the cell to double in size.3 While other proteins come and go during thecell cycle, the proteins of the origin recognition complexremain bound to the DNA throughout.4 Chromosomes are positioned on the metaphaseplate by equal and opposite forces that pull them towardthe two poles of the spindle.5 Meiosis segregates the paternal homologs intosperm and the maternal homologs into eggs.6 If we could turn on telomerase activity in all ourcells, we could prevent aging.
The model system Saccharomyces cerevisiae (budding yeast) has a comparable regulatory stage. What are two factors that can influence a yeast cell’s decision to initiate a new round of the cell cycle?
Oncologists (cancer doctors) frequently measure the mitotic index of tumor cells when they are removed via surgery or biopsy. What do you think is the value of finding out the mitotic index of these cells?
In experiment of importance of cell cycle control, what does your reults indicate about cell cylce control? suppose a person developed a mutation in a somatic cell diminishes the performance of the body's natural cell cycle control proteins. this mutation resulted in cancer, but was effectively treated with cocktail of cancer-fighting techniques. is it possible for this person's future children to inherit this cancer-causing mutation? Be specific when you are explain why or why not.