Difficulty: Easy

Average Score: 86%

Which combination of cell cycle phase and descriptor is correct?

Rationale

G1 phase - the phase prior to the start of mitosis in which the cell continues to grow in size and make proteins.

The G1 phase, also known as the first gap phase, is crucial for cell growth and preparation for DNA synthesis. During this phase, the cell increases in size, produces RNA, and synthesizes proteins necessary for DNA replication and subsequent phases of the cell cycle.

A (S phase - the cell synthesizes DNA and doubles its cytoplasm) YOUR ANSWER

The S phase, or synthesis phase, is primarily characterized by the replication of DNA, where the cell duplicates its chromosomes. While some cytoplasmic expansion may occur, this phase does not specifically focus on cytoplasm doubling, making this description inaccurate.

B (GÄâ€šï¿½ phase - the amount of chromosomes is doubled) YOUR ANSWER

The G2 phase occurs after DNA synthesis and involves final preparations for mitosis. Although the chromosomes are indeed doubled by the end of the S phase, the G2 phase itself is defined by the cell's preparation for mitosis, not by the doubling of chromosomes, which is completed earlier.

C (GÄâ€šâ€š phase - the phase prior to the start of mitosis in which the cell continues to grow in size and make proteins) CORRECT

The G1 phase accurately describes a time when the cell is actively growing and synthesizing proteins needed for DNA replication. This phase sets the stage for the subsequent S phase and is crucial for cellular function prior to division.

D (Interphase - the cell increases in mass and number of organelles to prepare for cell division) YOUR ANSWER

Interphase encompasses the G1, S, and G2 phases, where the cell prepares for division. While it does involve growth, the description is overly broad and does not pinpoint the specific roles of the individual phases, particularly the unique processes in G1 and G2.

Conclusion

Accurate understanding of the cell cycle is fundamental in biology. The G1 phase is characterized by cell growth and protein synthesis, setting the foundation for DNA replication in the S phase. The other options misrepresent the specific characteristics of their respective phases, highlighting the importance of precise terminology in cell cycle descriptions.

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