CELL STRUCTURES AND FUNCTION
CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Centrioles
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Chromatids
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Internal regulators
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External regulators
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Detailed explanation-1: -Proteins that respond to events outside the cell are called external regulators. External regulators direct cells to speed up or slow down the cell cycle. Cancer is a disorder in which some of the body’s own cells lose the ability to control growth.
Detailed explanation-2: -Cyclins. Cyclins are a diverse group of regulatory proteins which appear throughout the cell cycle during different phases.
Detailed explanation-3: -Cyclins are proteins that regulate the timing of the cell cycle in eukaryotic cells.
Detailed explanation-4: -Cyclins, cyclin-dependent kinases (Cdks), and the APC/C.
Detailed explanation-5: -Give an example of an external signal that regulates cell division and explain how it works. PDGF (Platelet-derived growth factor) is an external signal that regulates. For example, if skin cells are broken up into pieces, PDGF is added to half the vessel to increase the cell numbers.