Before chromosomes segregate in M phase, they and the segregation machinery must be appropriately prepared. Indicate whether the following statements are true or false. If false, change a single noun to make the statement true

Question

A. Sister chromatids are held together by condensins from the time they arise by DNA replication until the time they separate at anaphase.
B. Cohesins are required to make the chromosomes more compact and thus to prevent tangling between different chromosomes.
C. The mitotic spindle is composed of actin filaments and myosin filaments.
D. Microtubule-dependent motor proteins and microtubule polymerization and depolymerization are mainly responsible for the organized movements of chromosomes during mitosis.
E. The centromere nucleates a radial array of microtubules called an aster, and its duplication is triggered by S-Cdk.
F. Each centrosome contains a pair of centrioles and hundreds of ?-tubulin rings that nucleate the growth of microtubules.

Answer 1

A. False. Sister chromatids are held together by cohesins from the time they arise by DNA replication until the time they separate at anaphase.
B. False. Condensins are required to make the chromosomes more compact and thus to prevent tangling between different chromosomes.
C. False. The contractile ring is composed of actin filaments and myosin filaments.
D. True.
E. False. The centrosome nucleates a radial array of microtubules called an aster, and its duplication is triggered by S-Cdk.
F. True.