Understanding the Cell Cycle

Why is cell division essential for multicellular organisms?

• To decrease the number of cells

• To increase the size of individual cells

• To replace dead or damaged cells

• To reduce the organism's size

What is the primary activity of a cell in the G0 phase?

• Actively dividing

• Performing normal cellular functions

• Synthesizing DNA

• Preparing for division

During which phase of interphase is DNA replicated?

• G2 phase

• S phase

• G0 phase

• G1 phase

What happens during prophase of mitosis?

• The cell membrane pinches in

• Chromosomes line up in the middle of the cell

• Chromosomes condense and become visible

• Sister chromatids separate

Which phase of mitosis involves the sister chromatids lining up in the center of the cell?

• Prophase

• Telophase

• Metaphase

• Anaphase

What is the role of cytokinesis in cell division?

• To replicate DNA

• To form two separate nuclei

• To condense chromosomes

• To divide the cytoplasm and form two cells

What are cyclins?

• Lipids that form cell membranes

• Proteins that regulate the cell cycle

• Proteins that degrade DNA

• Enzymes that synthesize proteins

What can result from a failure in cell cycle regulation?

• Enhanced DNA replication

• Decreased cell division

• Uncontrolled cell growth leading to tumors

• Increased cell lifespan

Which external factor is known to increase the risk of cancer?

• Adequate sleep

• Regular exercise

• Balanced diet

• Exposure to harmful chemicals

What is the significance of the cell cycle in multicellular organisms?

• It enables growth and replacement of cells

• It decreases the number of cells

• It prevents cell division

• It allows for the reduction of cell size