Multiple Choice
What is the role of the p53 protein in the cell cycle in normal cells?
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11. Cell Division
Cell Cycle Regulation
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Which two types of proteins are primarily responsible for advancing a cell through the phases of the cell cycle?
A
Tubulin and kinesin
B
Cyclins and cyclin-dependent kinases (CDKs)
C
Actin and myosin
D
Histones and nucleosomes
Verified step by step guidance1
Understand the cell cycle: The cell cycle is a series of phases that a cell goes through to divide and produce new cells. It includes phases such as G1, S, G2, and M.
Identify the role of proteins in the cell cycle: Proteins are crucial in regulating the progression of the cell cycle, ensuring that each phase is completed accurately before moving to the next.
Focus on cyclins: Cyclins are a group of proteins that regulate the cell cycle by activating cyclin-dependent kinases (CDKs). Their levels fluctuate throughout the cell cycle, which helps control the timing of cell cycle events.
Understand cyclin-dependent kinases (CDKs): CDKs are enzymes that, when activated by binding to cyclins, phosphorylate target proteins to advance the cell cycle. They are essential for the transition between different phases of the cell cycle.
Conclude the primary proteins: Cyclins and CDKs work together to ensure the cell cycle progresses smoothly, making them the primary proteins responsible for advancing a cell through the phases of the cell cycle.
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