Cell Cycle and Regulation Quiz

S phase is the stage in the cell cycle where DNA synthesis and replication occur.

The G1/S checkpoint monitors the integrity of DNA before allowing the cell to enter the synthesis phase.

G1 phase follows mitosis and involves cell growth, normal functioning, and preparation for DNA synthesis.

G1 phase is marked by cell growth and metabolic activity in preparation for DNA synthesis.

Interphase is not a phase of mitosis; it is the overall cell cycle stage encompassing G1, S, and G2 phases.

Prophase is the stage where chromosomes condense, becoming visible under a microscope, as a preparation for cell division.

MPF (Mitosis-Promoting Factor) is a protein complex that promotes cell cycle progression by activating various enzymes through phosphorylation.

Cyclins activate Cyclin-dependent kinases (Cdks), facilitating their role in regulating cell cycle transitions.

The mitotic spindle is a structure that helps separate chromosomes during cell division, ensuring their proper distribution to daughter cells.

Cdks phosphorylate specific target proteins, regulating various stages of the cell cycle.

Cytokinesis is the process where the cytoplasm of a parent cell is divided into two, forming two separate daughter cells.

APC/C regulates the degradation of cyclins, controlling the progression through different stages of the cell cycle.

p53 is a tumor suppressor protein that, when mutated, can result in the loss of control over cell division, contributing to cancer.

Rb regulates the transition from G1 to S phase by inhibiting the activity of certain proteins involved in cell cycle progression.

Cell cycle checkpoint activation can lead to various outcomes, but it does not directly involve DNA replication.

Cdk-phosphatase is an enzyme that dephosphorylates Cdks, rendering them inactive and contributing to cell cycle regulation.

The metaphase checkpoint ensures proper attachment of chromosomes to the mitotic spindle before allowing the cell to progress to anaphase.