Scelta multipla
How many stages are there in the cell cycle?
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11. Cell Division
Introduction to the Cell Cycle
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What role do cohesin proteins play in the cell cycle?
A
They initiate the replication of DNA during the S phase.
B
They are responsible for the breakdown of the nuclear envelope.
C
They facilitate the attachment of spindle fibers to chromosomes.
D
They hold sister chromatids together until anaphase.
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Cohesin proteins are crucial for maintaining the structure and integrity of chromosomes during cell division.
During the S phase of the cell cycle, DNA is replicated, resulting in two identical copies of each chromosome, known as sister chromatids.
Cohesin proteins form a complex that holds these sister chromatids together along their length, ensuring they remain paired until the appropriate time in mitosis.
As the cell progresses through mitosis, specifically during anaphase, the cohesin proteins are cleaved, allowing the sister chromatids to separate and move to opposite poles of the cell.
This separation is essential for the equal distribution of genetic material into the two daughter cells, ensuring each cell receives an identical set of chromosomes.
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