mitosis

What is the primary function of the cell cycle in multicellular organisms?

• To produce energy

• To ensure growth and repair of tissues

• To stop cell division

• To create genetic diversity

During which phase of the cell cycle does DNA replication occur?

• G1 phase

• S phase

• G2 phase

• M phase

In which phase of mitosis do sister chromatids separate?

• Prophase

• Metaphase

• Anaphase

• Telophase

How do spindle fibers contribute to chromosome movement during mitosis?

• They push chromosomes to one side of the cell

• They replicate DNA

• They attach to centromeres/kinetochores and pull chromatids apart

• They prevent chromosomes from condensing

Explain the difference between cytokinesis in plant cells and animal cells.

• Plant cells use a cleavage furrow, and animal cells form a cell plate

• Both form a cell plate

• Both use a cleavage furrow

• Plant cells form a cell plate, and animal cells use a cleavage furrow

What are the main checkpoints in the cell cycle?

• G1, S, G2

• G1, G2, and M

• S, G2, and M

• G1, G2, and anaphase

Why is uncontrolled cell division dangerous for an organism?

A) It leads to faster tissue repair
B) It results in genetic diversity
C) It can cause tumors and cancer
D) It slows down cell growth

• It can cause tumors and cancerrepair

• It results in genetic diversity

• It leads to faster tissue

• It slows down cell growth

How do cyclins and cyclin-dependent kinases (CDKs) regulate the cell cycle

• They send secretions to DNA
  

• They signal the cell to enter mitosis

• They degrade DNA

• They control the timing of the cell cycle

What happens during prophase of mitosis?

• Chromosomes align in the middle of the cell
  

• Chromosomes condense, and the nuclear membrane breaks down

• The cytoplasm divides

• Sister chromatids separate

What is the role of centrosomes during mitosis?

• They replicate DNA

• They condense chromosomes

• They break down the nuclear membrane

• They organize the mitotic spindle