91Ó°ÊÓ

Identical copies of chromatin held together by cohesin at the centromere are called _____.

a. histones.

b. nucleosomes.

c. chromatin.

d. sister chromatids.

Chromosomes are duplicated during what stage of the cell cycle?

a. G1 phase

b. S phase

c. prophase

d. prometaphase

Which of the following events does not occur during some stages of interphase?

a. DNA duplication

b. organelle duplication

c. increase in cell size

d. separation of sister chromatids

The mitotic spindles arise from which cell structure?

a. centromere

b. centrosome

c. kinetochore

d. cleavage furrow