What are some factors that might cause a cell to be unable to regulate its cell cycle

Some of the factors that might cause unregulated cell cycle are-

Explanation:

1. Genetic Mutation- mutation in the proto-oncogenes can turn them into oncogenes which stimulate cell division. Some common causes of genetic mutation are radiations, chemical agents called mutagens, etc.

2. Growth factors- these are the molecules that bind to receptor proteins to initiate a signaling pathway that can result in cell cycle.

3. Tumor suppressor genes- these are the genes responsible for stopping the cell to enter cell cycle. Inactivation of these genes can cause unregulated cell division.

4. Cell cycle checkpoints - during the cell cycle, a cell has to pass through certain checkpoints which make sure the continuity or stopping of the process. Problem in their regulation can cause uncontrolled cell division.

5. retroviruses- These are the viruses who have RNA as their genetic material instead of DNA. They replicate via DNA intermediate which when they insert inside a cell can start cell cycle.

human-caused climate hope this

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.