Final answer:
The assertion that tissues are primarily composed of cells in the M phase is false. Tissues mainly consist of cells in various stages of the cell cycle, most being in interphase, with only a small fraction actively dividing through mitosis in the M phase.
Step-by-step explanation:
The statement that tissues are composed primarily of cells in the M phase is false. The M phase, or mitotic phase, is just one part of the cell cycle where cell division occurs. Tissues consist of cells that are mostly in the interphase, during which cells grow, perform their primary functions, and prepare for division. However, at any given moment, only a small percentage of cells in a tissue are in the M phase. Mitosis, which includes the processes of prometaphase, metaphase, anaphase, and telophase, results in the formation of two daughter cells with identical DNA to each other, as stated in point 13. This diversity in cellular activity and stage is essential for the proper function and maintenance of tissues.