Unit 4 & 6 Exam

Why does the cell cycle occur?

• Growth and Repair

• Growth and Duplication

• Repair and Duplication

• Duplication and Feedback

What are the phases of interphase?

• G1, S, G2

• G1, S, G2, M

• S, G2, M

• G0, S, G1

In what phase of the cell cycle does the cell grow and create the enzymes required for DNA replication?

• G1

• S

• G2

• M

• G0

Cells that no longer divide enter which phase of the cell cycle?

• G1

• S

• G2

• M

• G0

In what stage of the cell cycle does the DNA replicate?

• G1

• S

• G2

• M

• G0

After the S phase, how many copies of the chromatid are there and what are they called?

• Three Copies; Chromosomes

• Two Copies; Sister Chromatids

• Two Copies; Centromeres

• Three Copies; Kinetochores

Mitosis results in?

• Two Diploid Identical Daughter Cells

• Two Haploid Identical Daughter Cells

• Four Diploid Genetically Varied Daughter Cells

• Four Haploid Genetically Varied Daughter Cells

During what stage of mitosis does the spindle fiber attached to the chromosomes at the kinetochore and lined them up at the equatorial plate?

• Metaphase
• Telophase
• Prophase
• Anaphase
• Cytokinesis

What occurs during prophase?

• Chromosomes align down center of equatorial plate

• Chromosomes separated from the centromeres and move to opposite poles

• Nuclear envelope becomes stronger
• Chromatin condenses into chromosomes, nuclear envelope breaks down, and spindle fibers begin to form.

What occurings during anaphase?

• Synthesis of new DNA
• Formation of spindle fibers
• Cytokinesis
• Separation of sister chromatids