Cell Cycle Control

The video explores the cell cycle, explaining how cells grow, divide, and are regulated. It discusses the importance of the cell cycle in growth and development, and how its dysregulation can lead to cancer. The video details the phases of the cell cycle, including interphase and M phase, and highlights the role of checkpoints in ensuring proper cell division. It also covers the role of proteins like cyclin and Cdk in regulating the cycle, and introduces the concept of apoptosis. The G0 phase is explained as a resting phase for certain cells, such as neurons, which do not divide.

What is the basic unit of life that forms tissues, organs, and organ systems?

• Molecules

• Cells

• Atoms

• Organelles

How does a multicellular organism primarily grow?

• By expanding its tissues

• By absorbing more nutrients

• By making more cells through cell division

• By increasing the size of each cell

What is a major consequence of uncontrolled cell division?

• Increased energy levels

• Cancer

• Improved cell communication

• Enhanced tissue repair

During which phase do cells spend most of their time?

• Cytokinesis

• M phase

• G0 phase

• Interphase

What is the purpose of checkpoints in the cell cycle?

• To speed up cell division

• To ensure cells are ready to divide

• To stop cell growth

• To initiate DNA replication

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

• It undergoes apoptosis

• It enters a dormant state

• It continues to divide

• It repairs itself automatically

Which protein is known as a positive regulator in the cell cycle?

• p53

• Cyclin

• Actin

• Tubulin

What is the role of the G0 phase in the cell cycle?

• Cells repair DNA damage

• Cells undergo rapid division

• Cells perform functions without preparing to divide

• Cells prepare for division

Which type of cells are likely to remain in the G0 phase permanently?

• Skin cells

• Muscle cells

• Blood cells

• Neurons

What is the function of negative regulators in the cell cycle?

• To increase cell size

• To promote cell division

• To stop the cell cycle

• To enhance DNA synthesis