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- what differences can you see when you compare the nucleus of a dividing cell with that of a non-dividing cell?Label the following structure/s: (Figure 3) Ripe tomato cells, locate the small orange or reddish chromoplasts in the cytoplasm.Examine the micrograph of the yeast cells. The scale bar under thephoto is labeled 1 µm. The scale bar works in the same way as ascale on a map, where, for example, 1 inch equals 1 mile. In thiscase the bar represents one thousandth of a millimeter. Using thescale bar as a basic unit, determine the diameter of the matureparent cell and the new cell. Start by measuring the scale bar andthe diameter of each cell. The units you use are irrelevant, butworking in millimeters is convenient. Divide each diameter by thelength of the scale bar and then multiply by the scale bar’s lengthvalue to give you the diameter in micrometers.
- Abiologist prepares a slide ofstained cells undergoing mitotic prometaphasefor examination undera light microscope. He sees several very dark stained rod – shaped structures in the cells. These “colored bodies” are most likely?TELOPHASE + Cytokinesis:Find and observe a telophase.Sketch or paste it on the rightMatch each term with its best description. ___ cell plate a. lump of cells ___ spindle b. made of microfilaments ___ tumor c. divide plant cells ___ cleavage furrow d. spindle originates here ___ contractile ring e. dangerous metastatic cells ___ cancer f. made of microtubules ___ centrosomes g. indentation ___ telomere h. shortens with age
- Onion meristem cells complete a cell cycle in 800 minutes. Calculate the portion of the cycle spent in prophase. Number of Onion Meristem Cells in Each Phase Phase Specimen 1 Interphase 328 Prophase 70 Metaphase 22 Anaphase 18 Telophase 15 Answer: ____ minutesRecord your answer as a whole number.Cytokinesis , or division of the cytoplasm to create two new daughter cells , occurs in conjunction with telophase . Examine the telophase micrographs of the onion root tip and whitefish blastodisc cells . How does cytokinesis look different for these two cells ? Explain why cytokinesis looks different between those cellsattached 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…