The Life Cycle of Cells and Their Role in Growth and Development

The video explores the cell cycle, explaining how cells grow and divide, and the importance of regulation to prevent uncontrolled growth, such as cancer. It covers the phases of the cell cycle, including interphase and M phase, and the role of checkpoints in ensuring proper cell division. The video also discusses the role of proteins like cyclin and Cdk in regulating the cycle, and introduces the concept of apoptosis. Finally, it touches on the G0 phase, where cells are in a resting state, and concludes with a call to stay curious.

What is the basic unit of life according to cell theory?

• Cells

• Tissues

• Organs

• Organ systems

How do multicellular organisms grow?

• By merging cells together

• By reducing the number of cells

• By increasing the size of each cell

• By producing more cells through division

What is a major consequence of uncontrolled cell division?

• Formation of tumors

• Increased cell communication

• Enhanced cell function

• Improved nutrient absorption

During which phase do cells spend most of their time?

• Cytokinesis

• G0 phase

• Interphase

• M phase

What is the purpose of cell cycle checkpoints?

• To increase DNA replication

• To stop cell growth

• To ensure cells divide without errors

• To speed up cell division

What happens if a cell cannot pass a checkpoint and the issue cannot be fixed?

• The cell undergoes apoptosis

• The cell enters G0 phase

• The cell repairs itself

• The cell continues to divide

Which protein is involved in positive regulation of the cell cycle?

• Myosin

• Actin

• Cyclin

• p53

What is the role of Cdk in the cell cycle?

• It initiates apoptosis

• It repairs DNA

• It binds with cyclin to regulate the cycle

• It stops cell division

What is the G0 phase?

• A phase of DNA synthesis

• A phase where cells prepare to divide

• A resting phase where cells do not prepare to divide

• A phase of rapid cell division

Why might neurons in the brain and spinal cord not heal well after injury?

• They lack DNA

• They are always in M phase

• They are permanently in G0 phase

• They have too many checkpoints