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.

G1 phase is primarily associated with cell growth and preparation for DNA synthesis, but it does not involve actual DNA replication.

After cytokinesis, the cell enters G1 phase, marked by cell growth and preparation for the next round of 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.

Cancer cells often exhibit a loss of contact inhibition, leading to uncontrolled cell growth and proliferation.

CKIs play a role in regulating the cell cycle by inhibiting the activity of cyclin-dependent kinases.

ORC initiates DNA replication by binding to specific sites on the DNA during the S phase.

The G2/M checkpoint ensures that the cell does not enter mitosis if DNA damage is detected, preventing the propagation of damaged DNA.

p21 inhibits the activity of cyclin-dependent kinases, regulating the progression of the cell cycle.

DNA polymerases catalyze the addition of nucleotides, facilitating the synthesis of new DNA strands during DNA replication.

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.