Question

question 41
sister chromatids are held together by.
a a chromomere.
b a chromosome fiber.
c a centromere.
d a centrosome.
e a centriole.
question 42
chromosomes condense during ______ of mitosis.
a prophase
b s phase
c anaphase
d metaphase
e cytokinesis
question 43
a cell spends most of its time in.

Explanation:

• Question 41: Sister chromatids are held together by a centromere. A centromere is a region of a chromosome that links sister chromatids. A chromomere is a bead - like structure on a chromosome. A chromosome fiber is a part of the chromosome structure related to its physical form. A centrosome is an organelle that organizes microtubules. A centriole is a part of the centrosome.
• Question 42: Chromosomes condense during prophase of mitosis. In prophase, chromatin (loose DNA) condenses into visible chromosomes. S phase is part of interphase (not mitosis) where DNA is replicated. In anaphase, sister chromatids separate. In metaphase, chromosomes align at the cell's equator. Cytokinesis is the division of the cytoplasm.

Answer:

• Question 41: C. a centromere
• Question 42: A. prophase