Which of the following best describes cells that are arrested in G₀? A) embryonic B) cancerous C) germ line D) somatic E) syncytial

Question

Quizplus · Accepted Answer

The cell cycle contains four stages: G1, S, G2, and M. During the G1 phase, cells grow and replicate their organelles. The S phase is where DNA replication occurs, and the G2 phase is where cells prepare to divide. The M phase is where cells actually divide. If cells do not receive the correct signals to proceed through the cell cycle, they may become arrested at a specific point. The cells described in the question are arrested in the G1 stage, specifically at the restriction point (R-point) which is labeled 1U1B. This is the point in the cell cycle where cells decide whether or not to divide. If cells receive the proper signals, they will proceed through the rest of the cell cycle. However, if cells do not receive the proper signals, they will exit the cell cycle and enter a quiescent stage, which is called G0. Cells that are arrested in G₀ are likely somatic cells. Embryonic cells should be actively dividing, so they should not be arrested in G1. Cancerous cells often exhibit uncontrolled growth and division, so they would not be arrested in G1. Germ line cells are cells that produce gametes, so they should not be arrested in G1 either. Syncytial cells are cells with multiple nuclei, so the term does not apply in this context.

Which of the Following Best Describes Cells That Are Arrested