3:39 PM A © O 1 Edit f 88 8 Convert this document and share it as an Share image 1, The cell cycle in a cell line is 30 hours, S phase takes 3.5 hours, mitosis takes 1 hour and G2 takes 12 hours. How long is Gi in this cell line? How long is interphase? 2. What would be likely to happen if you inhibited protein phosphorylation near the G2 -M checkpoint in a cell culture? 3. According to the figure below, chromosomes oscillate back and forth along the microtubules after their attachment to the spindle. What is thought to cause this oscillatory movement? (a) (b) (c) DO DO Tools Mobile View Share Edit on PC School Tools

3:39 PM A © O 1 Edit f 88 8 Convert this document and share it as an Share image 1, The cell cycle in a cell line is 30 hours, S phase takes 3.5 hours, mitosis takes 1 hour and G2 takes 12 hours. How long is Gi in this cell line? How long is interphase? 2. What would be likely to happen if you inhibited protein phosphorylation near the G2 -M checkpoint in a cell culture? 3. According to the figure below, chromosomes oscillate back and forth along the microtubules after their attachment to the spindle. What is thought to cause this oscillatory movement? (a) (b) (c) DO DO Tools Mobile View Share Edit on PC School Tools

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter6: Reproduction At The Cellular Level

Section: Chapter Questions

Problem 1ACQ: Figure 6.4 Which of the following is the correct order of events in mitosis? a. Sister chromatids...

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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.
23. what stage of mitosis in which chromosomes begin to undergo a condensation process that will continue until metaphase?a. interphaseb. telophasec. prophased. prometaphase24. this stage of mitosis is characterized by an abrupt separation of sister chromatidsa. interphaseb. cytokinesisc. anaphased. prophase
Need answer of 4,5,6. Shortly plz 4.If the most basic function of the cell cycle is to duplicate accurately the DNA in the chromosomes and then distribute the copies precisely to the daughter cells, why are there gaps between S phase and M phase? 5. Describe the molecular mechanism of a CDK activation. 6. What is the cyclin-CDK complex in the M phase of the cell cycle?
Rb is a negative regulator that blocks the cell cycle at the G1 checkpoint until the cell achieves a requisite size. What molecular mechanism does Rb employ to halt the cell cycle?
Chemotherapy drugs such as vincristine (derived from Madagascar periwinkle plants) and colchicine (derived from autumn crocus plants) disrupt mitosis by binding to tubulin (the subunit of microtubules) and interfering with microtubule assembly and disassembly. Exactly what mitotic structure is targeted by these drugs and what effect would that have on cell division?
The mitotic spindles arise from which cell structure? centromere centroscme kinetochore cleavage furrow
The fusing of Golgi vesicles at the metaplhase plate of dividing plant cells forms what structure? cell plate actin ring cleavage furrow mitotic spindle
FtsZ proteins direct the formation of a ___________ that will eventually form the new cell walls of the daughter cells. contractile ring cell plate cytoskeletom septum
If the M checkpoint is not cleared, what stage of mitosis will be blocked? prophase prometaphase metaphase anaphase
Figure 6.4 Which of the following is the correct order of events in mitosis? a. Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the initotic spindle. The nucleus re-forms and the cell divides. The sister chromatids separate. b. The kinetochore becomes attached to the mitotic spindle. The sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus re-forms and the cell divides. c. The kinetochore becomes attached to metaphase plate. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus re-forms and the cell divides. d. The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. The kinetochore breaks apart and the sister chromatids separate. The nucleus re-forms and the cell divides.
The cell above is a lung cell of a salamander. In which stage of mitosis is it? What are the structures visible in green and blue fluorescence?
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.