You are running general tests in a cell solution and you have detected a large concentration Single Strand Binding Protein. What specific stage is the cell in the cycle?
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You are running general tests in a cell solution and you have detected a large concentration Single Strand Binding Protein. What specific stage is the cell in the cycle? Explain your answer. |
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- A cell stops proliferating when treated with a chemical analog to fucoxanthin. When these cells are analyzed and compared to untreated cells according to the amount of DNA they contain using flow cytometry, the graphs in the figure below are obtained. Which of the following answers would NOT cause this result?Suppose cells in an experiment had been labeled with green fluorescent tubulin. At the onset of Anaphase B, you use your laser to bleach a stripe across all of the microtubules on one side of the spindle as shown by the dashed line. This does not hurt the function of the microtubules in any way, but the bleached, nonfluorescent subunits in the microtubules now serve to mark a fixed location relative to the (+) and (-) ends. pl. membr. spindle A. Label one of each of the following: kinetochore MT, astral MT, polar MT. Indicate (+) and (-) ends. B. As the cell progresses through anaphase B, do the bleached spots get closer to, further from, or stay the same distance from the spindle pole they are embedded in? Why? Do they get closer to, further from, or stay the same distance from the plasma membrane? Why?What is necessary for a cell to pass the G2 checkpoint? a. cell has reached a sufficient size b. an adequate stockpile of nucleotides c. accurate and complete DNA replication d. proper attachment of mitotic spindle fibers to kinetochores
- The drug taxol is extracted from the bark of yew trees. It binds tightly to microtubules and stabilizes them. When added to cells, it causes much of the free tubulin to assemble into microtubules. Taxol can be used as an anticancer drug. At the molecular level, what does the drug prevent? At the cellular level, what part of cell division does it prevent? Be specific.In order to investigate the cell cycle in HEK293 cells in culture, I ran a flow cytometry experiment. I labeled their nuclei with DAPI to analyze DNA content. In these flow cytometry plots below, label the two main phases of the cell cycle that you can see. Briefly, explain your answer.Draw a diagram of the cell cycle and label the phases. On your diagram: a) For each phase, indicate whether the chromosomes are condensed or not. b) Indicate the phase(s) when it is possible to do a karyotype c) Indicate the phase-transition(s) where the cell would arrest if you add hydroxyurea.
- 1) Examine the picture of an onion root tip with cells in various stages of the cell cycle. A student claims that interphase is the longest stage of the cell cycle. Another student claims that mitosis is the longest stage. Using evidence from the photo, determine which student is correct and why. A) Mitosis is the longest stage because anaphase requires more time to separate chromatids. B) Interphase is the longest stage because chromosomes are visible in the majority of the cells. C) Mitosis is the longest stage because the majority of the cells in the photo are replicating their DNA. D) Interphase is the longest stage because the majority of the cells in the photo have uncondensed chromatin and are not dividing. Not GradedA scientist collects cells at various points in the cell cycle and isolates DNA from them. Using density-gradient centrifugation, she separates the nuclear DNA and mtDNA. She then measures the amounts of mtDNA and nuclear DNA present at different points in the cell cycle. On the following graph, draw a line to represent the relative amounts of nuclear DNA that you expect her to find per cell throughout the cell cycle. Then, draw a dotted line on the same graph to indicate the relative amounts of mtDNA that you would expect to see at different points throughout the cell cycle.attached image is an image of the cells you would have been looking at under the microscope Count at least 50 cells. When done, there should be at least 50 marks on the table (one mark for each cell). You may need to count more than 50 to find at least one of every phase. Calculate the proportions, and estimate the amount of time spent in each phase and subphase. The table will lead you through how this works. Take the number of cells in a particular phase, divided by the total number of cells examined (i.e., 50—or more), then multiply by 24 (the number of hours an average onion root tip cell takes to complete the entire cycle. This should give the hours a cell spends in each phase. Again, this assumes, that the entire cell cycle for onion root cells is 24 hours. This time can vary in different organisms. FILL-IN this table with the results of your count of 50 cells Phase/Subphase # of cells Calculation (fraction of cells x total hours of the cell cycle) # hours spent…
- How long does it take for a cell to take one complete cycle? The answer varies on the type of cell and the species. For instance, a liver cell completes its cell cycle for over 22 hours (Becker and Lane 1965) while other somatic cell lasts to about 18 hours. Can you cite other types of cells that undergo cell cycle and the time it takes to complete the cycle? List five below.Cleavage furrow formed during cytokinesis is found in? A-both in animal and plants B- neither in animal nor in plant cells C- plant cells D- animal cells3) Examine the graph showing the relative percentage normal and cancer cells spend in various stages of the cell cycle. Based on the information in the graphs, infer how cancer cells differ from typical, noncancerous cells. Select ALL that apply. A) Cancer cells do not replicate their DNA. B) Cancer cells replicate their DNA too quickly. C) Cancer cells do not go through interphase during their cell cycle. D) Cancer cells spend more time dividing compared to typical cells. E) Cancer cells do not always grow to the same size as typical cells. more than 1 answer. not graded