Question

What are the organelles called that use spindle fibers to separate sister chromatids during mitosis?
Responses

Sister chromatids
Sister chromatids

Kinetochore
Kinetochore

Centrioles
Centrioles

Centromere

Answer 1

The organelles that use spindle fibers to separate sister chromatids during mitosis are called **Centrioles**. However, it's important to clarify that the spindle fibers originate from the centrosomes, which contain centrioles. The term that specifically refers to the protein structures where spindle fibers attach to chromosomes is **Kinetochore**.

For clarity:
- **Centrioles** are involved in organizing the mitotic spindle.
- **Kinetochore** is where spindle fibers attach to sister chromatids.
- **Centromere** is the region of the chromosome where sister chromatids are joined.

In this context, if you're referring directly to the structures that attach the spindle fibers to the chromatids, the best term is **Kinetochore**.