Home › STAAR EOC Biology › Biology › Cell Reproduction › What has to break down before sister chromatids …
What has to break down before sister chromatids can separate in anaphase?
AThe condensin proteins
BThe kinetochore discs
CThe cohesin proteins
DThe histone protein core
Answer & Solution
Correct answer: C. The cohesin proteins
1. Cohesin is the protein that clamps the two sister chromatids together at the centromere.
2. While cohesin holds, the spindle can pull but the chromatids cannot come apart.
3. In anaphase the cohesin proteins are degraded.
4. The chromatids then separate and each is pulled toward its own pole.
5. Condensin coils the chromatids during prophase and is not what holds them together.
_Source: OpenStax Biology 1e (CC BY 4.0), Chs 10 and 11, section 10.2 The Cell Cycle_
Related questions
At which stage does the nuclear envelope begin to break into small vesicles?Naming the mitotic stages in order gives prophase, prometaphase, metaphase and then:Conjoined sister chromatids become visible under a light microscope at a diameter of aboutHuman blood type is determined by two versions of a gene drawn from how many possible sequMatched pairs of chromosomes in a diploid organism are described as homologous, yet their Plant cells complete cytokinesis differently from animal cells because they build a:In an animal cell, cytokinesis pinches the cell in two along a structure called the:Spindle microtubules that never attach to a chromosome are called: