Science Entrance Practice Exam

The primary cellular function of mitosis is centered around enabling growth and tissue repair. Mitosis is the process through which a single cell divides to produce two identical daughter cells, each with the same number of chromosomes and genetic information as the original cell. This process is crucial during the growth of an organism, as it allows for the increase in the number of cells, leading to overall growth and the development of tissues and organs.

In addition to growth, mitosis plays a vital role in tissue repair. When tissues are damaged—whether due to injury, disease, or normal wear and tear—mitosis allows for the replacement of dead or damaged cells. This ability to regenerate and maintain healthy tissues is essential for the overall functioning and longevity of an organism.

The other options pertain to different processes. The production of gametes for reproduction is a function of meiosis, which reduces the chromosome number by half and facilitates genetic diversity through recombination. Increasing genetic variation is primarily attributed to processes like sexual reproduction and mutations, rather than mitosis, which produces genetically identical cells. Performing photosynthesis is a function specific to certain organisms, like plants and some algae, and is not related to the cellular division processes that mitosis entails. Therefore, the key purpose