AP Biology Questions on Prometaphase

📚 Quick Study Guide

• 🧬Prometaphase Definition: The phase of cell division (mitosis and meiosis) following prophase and preceding metaphase, during which the nuclear envelope breaks down and the spindle microtubules attach to the kinetochores of the chromosomes.
• 🔬Nuclear Envelope Breakdown: The nuclear envelope fragments into small vesicles.
• 💪Kinetochore Microtubule Attachment: Microtubules from the mitotic spindle attach to the kinetochores, protein structures located at the centromere of each chromosome.
• 🤸‍♀️Chromosome Movement: Chromosomes start moving towards the metaphase plate (the equator of the cell).
• 🎯Spindle Formation: The mitotic spindle continues to develop.
• 🧪Key Events:
  • Nuclear envelope breakdown
  • Chromosome attachment to spindle microtubules
  • Initiation of chromosome movement

Practice Quiz

1. Which of the following events characterizes prometaphase?
1. A) Chromosomes condense.
2. B) The nuclear envelope breaks down.
3. C) Chromosomes replicate.
4. D) Cytokinesis begins.
2. During prometaphase, what structure do microtubules attach to on the chromosomes?
1. A) Centrosome
2. B) Centriole
3. C) Kinetochore
4. D) Chromatin
3. What is the primary role of the mitotic spindle during prometaphase?
1. A) To replicate DNA.
2. B) To break down the nuclear envelope.
3. C) To attach to and move chromosomes.
4. D) To initiate cytokinesis.
4. What happens to the nuclear envelope during prometaphase?
1. A) It reforms around the chromosomes.
2. B) It remains intact.
3. C) It fragments into small vesicles.
4. D) It elongates to accommodate the chromosomes.
5. Where do chromosomes move towards during prometaphase?
1. A) The cell poles.
2. B) The metaphase plate.
3. C) The nuclear envelope.
4. D) The centrosomes.
6. Which of the following is NOT a characteristic of prometaphase?
1. A) Chromosome condensation.
2. B) Nuclear envelope breakdown.
3. C) Attachment of microtubules to kinetochores.
4. D) Chromosomes aligning at the metaphase plate.
7. What is the state of the mitotic spindle during prometaphase?
1. A) It is fully formed and functional.
2. B) It is disassembling.
3. C) It is continuing to develop.
4. D) It is not present.