Cell Division Dynamics and the Cell Cycle

The video tutorial explains cell division, focusing on the cell cycle's phases: G1, S, G2, and M. It details the processes of DNA replication, chromatid formation, and mitosis stages, including prophase, metaphase, anaphase, and telophase. The G0 phase, where cells exit the cycle, is also discussed. Key checkpoints ensure proper division, and the role of proteins and growth factors is highlighted.

What is the primary purpose of cell division?

• To create energy

• To produce two or more daughter cells

• To destroy old cells

• To change the cell's function

How many chromosomes does a typical human cell contain?

• 23

• 46

• 44

• 22

Which phase of the cell cycle is known for its variability in duration?

• G2 phase

• S phase

• G1 phase

• M phase

What is the main function of the G1 phase?

• DNA replication

• Cell growth and synthesis of RNA and proteins

• Cell division

• Chromosome alignment

What happens if the G1 checkpoint is lost?

• DNA replication is halted

• Cells enter the G0 phase

• Unregulated cell division occurs

• Cells stop dividing

During which phase does DNA replication occur?

• M phase

• G2 phase

• S phase

• G1 phase

What is the role of cohesin proteins during the S phase?

• To separate sister chromatids

• To attach sister chromatids at the centromere

• To initiate cell division

• To repair DNA mismatches

What is the main event during the M phase?

• RNA synthesis

• Separation of sister chromatids

• Cell growth

• DNA replication

What is the G0 phase also known as?

• Active phase

• Resting phase

• Synthesis phase

• Division phase

Which cells are most likely to remain in the G0 phase?

• Blood cells

• Skin cells

• Mature neurons

• Intestinal lining cells