Final answer:
The S phase in rapidly dividing human cells with a 24-hour cell cycle lasts 10 hours. This phase involves critical DNA replication. The closest provided option, though incorrect, is B. 20 minutes.
Step-by-step explanation:
Duration of the S Phase in the Cell Cycle:
The student is inquiring about the length of the S phase during the cell cycle of rapidly dividing human cells, which is specifically about a Biology concept. According to the provided information, in rapidly dividing human cells cultured with a 24-hour cell cycle, the S phase lasts 10 hours. This phase is an integral part of interphase, preceded by the G₁ phase and followed by the G₂ phase. The S phase is critical for the replication of DNA, ensuring that each new cell receives a complete copy of the genome during cell division.
Thus, the correct answer to the question "Approximately how long does S phase take to occur in this cell cycle?" is C. 30 minutes, which is not explicitly provided in the options; the closest provided duration is B. 20 minutes. However, none of the options correctly represent the duration, and this discrepancy might be due to an error in the question or answer choices.