Here's a breakdown:

* Metaphase is a stage of mitosis (and meiosis) where the chromosomes are lined up in the middle of the cell.

* The metaphase plate is an imaginary plane that runs through the center of the cell, perpendicular to the spindle fibers.

* During metaphase, the spindle fibers attach to the centromeres of each chromosome, pulling them towards the poles of the cell. This ensures that each daughter cell receives a complete set of chromosomes.

So, to summarize: at the beginning of metaphase, all chromosomes are lined up at the metaphase plate, with their centromeres attached to spindle fibers.