Question

1. refer to model 1.

a. describe what happens to the nuclear membrane after prophase.
b. explain why it is necessary that the nuclear membrane disintegrates during mitosis.
c. at what point during mitosis has the nuclear membrane reformed?

Explanation:

a. Prophase is the first stage of mitosis; after it, the nuclear membrane breaks down completely.
b. The disintegration removes the barrier between the nucleus and cytoplasm, allowing spindle fibers to access and attach to chromosomes, which is essential for separating chromosomes to opposite poles during mitosis.
c. Telophase is the final stage of mitosis, where separated chromosomes reach the poles, and nuclear membranes reform around each set of chromosomes to form two new nuclei.

Answer:

a. The nuclear membrane breaks down (disintegrates) completely after prophase.
b. The nuclear membrane must disintegrate to allow spindle fibers to access and attach to chromosomes, enabling the proper separation of chromosomes to opposite ends of the cell during mitosis.
c. The nuclear membrane is reformed during telophase of mitosis.