Cell A is actively engaging in growth and division. The cell encounters a damage in its DNA at a certain point in the cell cycle. What would be the reaction in the cells if the damage was sensed Before the R point is passed After passing the R point What would be the similarities and differences in the reaction in the cell in cases a and b? In your answer, briefly include the significance of the R point during the cell cycle

If the onion root spends most of its time in Interphase during Mitosis and the percentage of time was 8.92% according to my chart what is the actual values for onion root cells in Mitosis suppose to be?

A researcher, who is examining a sample of cells of the same types at different stages of cell division, isolates a group of cells in the sample that have 1.5 times the amount of DNA as cells at the G1 phase. Which of the following best describes this group of isolated cells? A B с D They are in the M phase of the cell cycle. They are between the G1 and the S phases in the cell cycle. They are in the S phase of the cell cycle. They are in the G2 phase of the cell cycle.

In the experiment below, you have treated cells with different cancer drugs, stained them with propidium iodide, and analyzed them by flow cytometry. Which of the following histograms illustrates what you would expect to see in the event that the spindle assembly checkpoint is activated (focus on the solid line, the dotted line is normal cell cycle control)?       1. D 2. C 3. A 4.B

You are studying the M-cyclin. You treat mitotic cells with an inhibitor of the proteasome and find that M-cyclin is no longer degraded and that this prolongs mitosis. You also find that in the presence of the inhibitor, M-cyclin is now running slower/larger in a Western than you have previously observed. In 1-2 sentences, explain why this might be happening. Edit View Insert Format Tools Table 12pt Paragraph B IU Αν S A C I AT²✓ #tv A MacBook Air X : G

2.) One experimental tool used in the biological research and in clinical settings is called Fluorescent Activated Cell Sorting (FACS) or cell cytometry. For example, a cell membrane permeable (or nonpolar) chemical called Hoescht 33342 dye will specifically label DNA. Interpret the graph (Figure 17-4) that illustrates normal cells that have been labeled with Hoescht 33342 dye, and assign which phase(s) of the cell cycle (G1, S, G2, or M) corresponds to the fluorescence intensity. Justify your answers. 1 relative fluorescence per cell Figure 17-4 Analysis of Hoechst 33342 fluorescence in a population of cells sorted in a flow cytometer (Problem 17-15). number of cells

A temperature-sensitive mutant yeast strain stops dividing when shifted from 25°C to 37°C.  These cells are analyzed at different temperatures by a machine that measures the amount of DNA they contain, and the following graphs are obtained. Cells in G1 phase should have ___ unit(s) amount of DNA. Which of the following would explain the behavior of your mutant? Mark yes or no for each of the following choices.  Inability to initiate DNA replication       Defect in chromosome condensation      Defect in centrosome duplication      Defect in cytokinesis