Multiple Choice
Which of the following occurs during the S phase of interphase?
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11. Cell Division
Introduction to the Cell Cycle
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What controls the progression of the cell cycle?
A
Ribosomes and endoplasmic reticulum
B
Mitochondria and chloroplasts
C
Cyclins and cyclin-dependent kinases (CDKs)
D
Lysosomes and peroxisomes
Verified step by step guidance1
Understand that the cell cycle is a series of phases that a cell goes through as it grows and divides. The main phases include G1, S, G2, and M phase.
Recognize that the progression through these phases is tightly regulated to ensure proper cell division and function.
Identify the key regulators of the cell cycle: Cyclins and Cyclin-dependent kinases (CDKs). Cyclins are proteins whose levels fluctuate throughout the cell cycle, while CDKs are enzymes that, when activated by cyclins, can phosphorylate other proteins to drive the cell cycle forward.
Learn that different cyclin-CDK complexes are active at different stages of the cell cycle, ensuring that the cell progresses through the cycle in a controlled manner.
Understand that the regulation by cyclins and CDKs is crucial for maintaining the integrity of the cell cycle, preventing uncontrolled cell division, which can lead to conditions such as cancer.
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