CELL DIVISION
CELL DIVISION AND CANCEROUS CELLS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A gap outside of the cell (caused by a skateboarding accident) triggers cell division.
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A cell receives a signal from the cell’s own nucleus to divide.
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Tumor cells continue to divide without receiving a signal.
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Hormones in the blood cause cell growth in a growing teenager.
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Detailed explanation-1: -The option that gives an example of internal regulation during the cell cycle would be a cell receiving a signal from the cell’s own nucleus to divide. The correct option would be B. Internal regulation of cells refers to the reaction of certain parts of cells to a signal given from the control center of cells.
Detailed explanation-2: -Internal regulators of the cell cycle consist of two formal, well-defined types: positive regulator molecules such as cyclins and cyclin-dependent kinases and negative regulator molecules such as Rb, p53 and p21.
Detailed explanation-3: -Kinases and Cyclins are Internal Factors that Regulate Division. When cells reach a checkpoint within the cell cycle, whether they continue division or abort the process is regulated by cyclin-dependent protein kinases.
Detailed explanation-4: -The complex formed by the various interactions of cyclins and CDKs-Cyclin CDK complex is responsible for the regulation and progression of the cell cycle.