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.
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 areas labeled checkpoint 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.
The S checkpoint (synthesis phase checkpoint) primarily focuses on ensuring that DNA replication has been completed correctly and that the DNA is not damaged. Evaluating cell size and protein reserves typically happens at the G1 checkpoint. Therefore, statement D is inaccurate in its assignment of functions to the S checkpoint.
**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.
The S checkpoint (synthesis phase checkpoint) primarily focuses on ensuring that DNA replication has been completed correctly and that the DNA is not damaged. Evaluating cell size and protein reserves typically happens at the G1 checkpoint. Therefore, statement D is inaccurate in its assignment of functions to the S checkpoint.