Question
Multicellular organisms use cell division and mitosis to grow, maintain, and repair cells and tissues. Few cells in the body do not undergo mitosis: most somatic cells divide regularly, some more than others. Single-celled organisms may use cell division as their method of reproduction. Regardless of the reason for mitosis, the process ensures genetic continuity. Consider the model of the cell cycle. Which statement does NOT correctly explain the purpose of the areas labeled checkpoint in the cycle? Responses A G1 the checkpoint where an animal cell becomes committed to the cell cycle, which is determined by external factors and signals.G1 the checkpoint where an animal cell becomes committed to the cell cycle, which is determined by external factors and signals. B The spindle checkpoint prevents separation of the duplicated chromosomes until each chromosome is properly attached to the spindle fibers.The spindle checkpoint prevents separation of the duplicated chromosomes until each chromosome is properly attached to the spindle fibers. C The G2 checkpoint ensures all of the chromosomes have been replicated and that the replicated DNA is not damaged before cell enters mitosis.The G2 checkpoint ensures all of the chromosomes have been replicated and that the replicated DNA is not damaged before cell enters mitosis. D Cell size, protein reserves, and damage to DNA is evaluated at the S checkpoint; the cell will not be allowed to continue if any problems are detected.
Answers
GPT-4o mini
The statement that does NOT correctly explain the purpose of the checkpoints in the cell cycle is:
**D Cell size, protein reserves, and damage to DNA is evaluated at the S checkpoint; the cell will not be allowed to continue if any problems are detected.**
This statement is incorrect because the evaluation of cell size, protein reserves, and DNA damage occurs at the G1 checkpoint, not the S checkpoint. The S checkpoint is primarily concerned with DNA replication, ensuring that DNA has been accurately replicated before the cell proceeds to mitosis.
**D Cell size, protein reserves, and damage to DNA is evaluated at the S checkpoint; the cell will not be allowed to continue if any problems are detected.**
This statement is incorrect because the evaluation of cell size, protein reserves, and DNA damage occurs at the G1 checkpoint, not the S checkpoint. The S checkpoint is primarily concerned with DNA replication, ensuring that DNA has been accurately replicated before the cell proceeds to mitosis.