The structures in the nucleus that serve as a "mitotic clock" are
A)telomeres.
B)kinases.
C)ribosomes.
D)hormones.

Question

Quizplus · Accepted Answer

Telomeres are the structures at the ends of chromosomes that shorten each time a cell divides. As telomeres become shorter, they reach a critical length where they can no longer protect the chromosome, and the cell undergoes senescence or apoptosis. Therefore, telomeres act as a "mitotic clock" that limits the number of times a cell can divide before it stops dividing or dies. Kinases are enzymes that facilitate mitosis, but they are not specific to limiting cell division. Ribosomes are involved in protein synthesis, and hormones are signaling molecules that regulate cellular processes but are not directly involved in controlling the number of cell divisions.

The Structures in the Nucleus That Serve as a "Mitotic