The two sister chromatids of a single chromosome are held together by a
A) centrosome.
B) spindle fiber.
C) centromere.
D) chromatin.

Question

Quizplus · Accepted Answer

The centromere is the specialized region of a chromosome where the two sister chromatids are held together. This attachment allows for proper separation of the sister chromatids during cell division.

Option A (centrosome) is incorrect because it is an organelle that helps in cell division by organizing the microtubules, but it is not directly involved in holding sister chromatids together.

Option B (spindle fiber) is incorrect because spindle fibers are responsible for separating the sister chromatids during cell division and are attached to the kinetochores located at the centromere.

Option D (chromatin) is incorrect because chromatin is the complex of DNA and proteins that makes up chromosomes, but it does not directly hold the sister chromatids together.

The Two Sister Chromatids of a Single Chromosome Are Held