Question

multiple choice question
what is the centrosome?
a darkly staining region of the nucleus
another name for the region where sister chromatids connect
an organizing center that is the origin of spindle fibers
the region of the plasma membrane where receptor proteins are concentrated

Explanation:

• Option A: A darkly staining region of the nucleus is the nucleolus, not the centrosome.
• Option B: The region where sister chromatids connect is the centromere, not the centrosome.
• Option C: The centrosome is an organizing center that serves as the origin of spindle fibers during cell division, which matches the definition of a centrosome.
• Option D: The region of the plasma membrane with concentrated receptor proteins is not related to the centrosome.

Answer:

C. An organizing center that is the origin of spindle fibers