Question

The spindle pole is organized around a small region of clear cytoplasm near the interphase nucleus called the

A. chiasma.
B. Barr body.
C. centromere.
D. centrosome.
E. cyclin.

Answer 1

The spindle pole is organized around a small region of clear cytoplasm near the interphase nucleus called the centrosome. During prophase of mitosis, the centrosomes move to opposite poles of the cell and microtubules extend to form the mitotic spindle.

Step-by-step explanation:

The spindle pole is organized around a small region of clear cytoplasm near the interphase nucleus called the centrosome. During prophase of mitosis, the centrosomes begin to move to opposite poles of the cell and microtubules start to extend from each centrosome, forming the mitotic spindle. The mitotic spindle is composed of the centrosomes and their emerging microtubules, which play a crucial role in cell division.

Answer 2

The spindle pole is organized around a small region of clear cytoplasm near the interphase nucleus called the centrosome. The centrosome is crucial for microtubule organization during cell division, facilitating the formation of the spindle apparatus. The answer is D. centrosome.

Step-by-step explanation:

The spindle pole organization is associated with the centrosome. The centrosome is a crucial cellular structure involved in microtubule organization during cell division. It consists of a pair of centrioles surrounded by pericentriolar material. As cells enter mitosis or meiosis, the centrosome duplicates, and the two centrosomes move to opposite poles of the cell, forming the spindle apparatus.

The other options refer to different cellular structures or processes. Chiasma (A) is a site of genetic recombination during meiosis. Barr body (B) is a condensed, inactivated X chromosome in the cells of individuals with more than one X chromosome. Centromere (C) is a specific region of a chromosome that plays a role in cell division. Cyclin (E) is a regulatory protein involved in the cell cycle.