Question

1. the pairs of sister chromatids are lined up at the center of the cell.
2. the chromosomes uncoil, loosen, and become less visible the cell.
3. the chromatids are pulled to opposite sides of the cell by the microtubules.
4. the nuclear membrane returns.
5. the sister chromatids form and join at the centromere
6. the nuclear membrane begins to break apart so that the microtubules can reach the pairs of sister chromatids

Explanation:

To solve this, we need to match each event to the correct stage of mitosis (or the cell cycle phases related to chromosome behavior). Let's recall the stages of mitosis: Prophase, Metaphase, Anaphase, Telophase, and also Interphase (for events like chromosome uncoiling and chromatid formation).

Question 8

Step 1: Identify the stage for "sister chromatids lined at center"
In Metaphase, the spindle fibers align the sister chromatid pairs (chromosomes) at the cell’s equatorial plate (center).

Question 9

Step 1: Identify the stage for "chromosomes uncoil, loosen"
After cell division (Telophase) or during Interphase (when the cell is not dividing), chromosomes uncoil into chromatin (less visible). This also happens in Telophase as the cell returns to interphase-like state.

Question 10

Step 1: Identify the stage for "chromatids pulled to opposite sides"
In Anaphase, the sister chromatids are separated and pulled to opposite poles by the spindle microtubules.

Question 11

Step 1: Identify the stage for "nuclear membrane returns"
In Telophase, the nuclear membrane reforms around the separated chromosomes at each pole.

Question 12

Step 1: Identify the stage for "sister chromatids form and join at centromere"
During S - phase of Interphase, DNA replicates, and sister chromatids are formed and joined at the centromere.

Question 13

Step 1: Identify the stage for "nuclear membrane breaks apart"
In Prophase, the nuclear envelope (membrane) breaks down to allow spindle fibers to access the chromosomes.

Final Answers (Matching to Mitosis Stages):

1. Metaphase (sister chromatids align at the cell’s equator).
2. Telophase/Interphase (chromosomes uncoil; Telophase transitions to interphase, or interphase itself has uncoiled chromatin).
3. Anaphase (sister chromatids are pulled apart to opposite poles).
4. Telophase (nuclear membrane reforms).
5. Interphase (S - phase) (sister chromatids form via DNA replication and join at centromere).
6. Prophase (nuclear membrane breaks down to allow spindle access).

Answer:

To solve this, we need to match each event to the correct stage of mitosis (or the cell cycle phases related to chromosome behavior). Let's recall the stages of mitosis: Prophase, Metaphase, Anaphase, Telophase, and also Interphase (for events like chromosome uncoiling and chromatid formation).

Question 8

Step 1: Identify the stage for "sister chromatids lined at center"
In Metaphase, the spindle fibers align the sister chromatid pairs (chromosomes) at the cell’s equatorial plate (center).

Question 9

Step 1: Identify the stage for "chromosomes uncoil, loosen"
After cell division (Telophase) or during Interphase (when the cell is not dividing), chromosomes uncoil into chromatin (less visible). This also happens in Telophase as the cell returns to interphase-like state.

Question 10

Step 1: Identify the stage for "chromatids pulled to opposite sides"
In Anaphase, the sister chromatids are separated and pulled to opposite poles by the spindle microtubules.

Question 11

Step 1: Identify the stage for "nuclear membrane returns"
In Telophase, the nuclear membrane reforms around the separated chromosomes at each pole.

Question 12

Step 1: Identify the stage for "sister chromatids form and join at centromere"
During S - phase of Interphase, DNA replicates, and sister chromatids are formed and joined at the centromere.

Question 13

Step 1: Identify the stage for "nuclear membrane breaks apart"
In Prophase, the nuclear envelope (membrane) breaks down to allow spindle fibers to access the chromosomes.

Final Answers (Matching to Mitosis Stages):

1. Metaphase (sister chromatids align at the cell’s equator).
2. Telophase/Interphase (chromosomes uncoil; Telophase transitions to interphase, or interphase itself has uncoiled chromatin).
3. Anaphase (sister chromatids are pulled apart to opposite poles).
4. Telophase (nuclear membrane reforms).
5. Interphase (S - phase) (sister chromatids form via DNA replication and join at centromere).
6. Prophase (nuclear membrane breaks down to allow spindle access).