During mitosis, a double-stranded chromosome is attached to a spindle fiber at the:
A. centriole.
B. centromere.
C. centrosome.
D. cell plate.
The centromere appears as a spot that holds the doubled chromosomes together and attached them to the spindle. The centrioles are the cell organelles, found in animal cells, that direct the movement of the chromosomes towards the poles. The cell plate forms in plant cells with rigid cell walls which can't pinch in to separate the two newly formed cells.