Cell Cycle Checkpoints and Functions

The video tutorial explains the importance of cell cycle checkpoints in ensuring proper cell division. It covers the G1, S phase, G2, and spindle assembly checkpoints, highlighting their roles in monitoring DNA integrity, preventing mutations, and ensuring accurate chromosome segregation. These checkpoints are crucial for maintaining genomic stability and preventing errors during cell division.

What is the primary purpose of cell cycle checkpoints?

• To speed up cell division

• To ensure proper cell division and prevent mutations

• To increase the number of cells

• To eliminate damaged cells

What does the G1 checkpoint primarily check for?

• Proper chromosome alignment

• DNA damage

• Cell size

• Nutrient availability

During which phase does the S phase checkpoint operate?

• G1 phase

• S phase

• G2 phase

• M phase

What is the main function of the S phase checkpoint?

• To check for cell size

• To initiate mitosis

• To monitor DNA replication and repair errors

• To ensure DNA is properly aligned

What does the G2 checkpoint ensure before mitosis begins?

• Chromosomes are aligned

• Cell size is adequate

• DNA replication is complete

• Cell has enough nutrients

What is the role of the spindle assembly checkpoint?

• To monitor cell size

• To ensure proper chromosome segregation

• To check for DNA damage

• To ensure DNA replication

What could happen if the spindle assembly checkpoint fails?

• Cells will not divide

• Cell size will decrease

• Chromosomes may not segregate properly

• DNA will not replicate

Which checkpoint is responsible for checking the attachment of spindle fibers to chromosomes?

• G2 checkpoint

• S phase checkpoint

• G1 checkpoint

• Spindle assembly checkpoint

What is the consequence of improper chromosomal segregation?

• Increased cell size

• Unequal distribution of chromosomes in daughter cells

• Faster cell division

• Increased DNA replication

What is the ultimate goal of cell cycle checkpoints?

• To produce identical daughter cells

• To reduce cell size

• To increase cell division speed

• To eliminate all mutations