Which of the following about cell proliferation is not true?

The statement about cell proliferation asserts that some cells must pass through checkpoints in the cell cycle to continue dividing, while others that divide more quickly do not. This is related to the concept of the cell cycle, which is divided into phases including G1, S, G2, and M. During this cycle, cells go through various checkpoints to ensure that conditions are favorable for division and that the cells are ready to proceed.

However, it is important to acknowledge that while most cells are subjected to the regulatory mechanisms of the cell cycle, certain cells, particularly those that are cancerous, can bypass these checkpoints and proliferate uncontrollably. On the other hand, cells that have a highly regulated growth pattern generally adhere to the cycle's checkpoints.

Therefore, the key point is that all normal, healthy dividing cells typically advance through these checkpoints to ensure genomic integrity and proper cell function, and most cells do not truly divide more quickly without some form of regulation involved.

The other statements emphasize valid aspects of cell behavior; for example, cells indeed require suitable conditions for division, particularly adhesion-dependent cells, which need a surface to attach for optimal proliferation. Furthermore, the statement about the duration of cell division can vary significantly among different cell types and conditions, but a