Understanding Cells and the Cell Cycle

What is the primary function of cells in multicellular organisms?

• To form tissues and organs

• To divide uncontrollably

• To work independently

• To remain static

How do multicellular organisms primarily grow?

• By producing more cells through division

• By merging cells together

• By increasing the size of each cell

• By reducing the number of cells

What is a major risk factor for cells becoming cancerous?

• Balanced diet

• Excessive exposure to UV light

• Regular exercise

• Lack of cell division

Which phase of the cell cycle involves DNA replication?

• G2 phase

• M phase

• S phase

• G1 phase

What is the main purpose of cell cycle checkpoints?

• To speed up cell division

• To ensure cells are ready to divide

• To stop cell growth

• To eliminate all cells

What happens if a cell cannot pass a checkpoint due to damage?

• It repairs itself automatically

• It becomes a cancer cell

• It continues to divide

• It undergoes apoptosis

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

• Insulin

• Hemoglobin

• Cyclin

• p53

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

• Cells prepare to divide

• Cells perform functions without dividing

• Cells rapidly divide

• Cells stop functioning

Why might neurons in the brain remain in the G0 phase?

• They are damaged

• They are preparing for division

• They are constantly dividing

• They do not need to divide

What is apoptosis?

• Cell growth

• Cell division

• Cell communication

• Cell self-destruction