Ch. 16 Exploring the Eukaryotic Cell Cycle

Which phase of the cell cycle is characterized by DNA replication?

• G1 phase

• S phase

• G2 phase

• M phase

What is the primary function of mitosis in multicellular organisms?

• Production of gametes

• Growth and repair

• Energy production

• Protein synthesis

During which stage of mitosis do the sister chromatids separate and move toward opposite poles?

• Prophase

• Metaphase

• Anaphase

• Telophase

What structure forms the spindle fibers that are essential for chromosome movement during mitosis?

• Ribosomes

• Centrosomes

• Lysosomes

• Nucleolus

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before anaphase begins?

• G1 checkpoint

• G2 checkpoint

• M checkpoint

• S checkpoint

What is the result of meiosis in terms of chromosome number in the daughter cells compared to the parent cell?

• Same number

• Double the number

• Half the number

• Triple the number

Which of the following best describes cytokinesis in animal cells?

• Formation of a cell plate

• Pinching in of the plasma membrane

• Disappearance of the nucleolus

• Condensation of chromatin

What is the main difference between mitosis and meiosis?

• Mitosis produces four cells, meiosis produces two

• Mitosis occurs only in gametes, meiosis in somatic cells

• Mitosis results in identical cells, meiosis in genetically diverse cells

• Mitosis involves two divisions, meiosis one

Which event increases genetic variation during meiosis?

• DNA replication

• Crossing over

• Cytokinesis

• Chromosome condensation

If a cell has 24 chromosomes at the start of mitosis, how many chromosomes will each daughter cell have at the end?

• 12

• 24

• 48

• 6