Final answer:
A gene that codes for a positive cell cycle regulator is referred to as a proto-oncogene. These genes are important for normal growth and division. The correct answer is option c).
Step-by-step explanation:
The gene that codes for a positive cell cycle regulator is called a proto-oncogene. These are normal genes that play a role in promoting cell division and growth. When a proto-oncogene mutates in a certain way, it can become an oncogene, which may lead to uncontrolled cell division and cancer development.
These genes play a role in promoting cell growth and division. In certain circumstances, mutations in proto-oncogenes can lead to uncontrolled cell division, resulting in the formation of tumors. Proto-oncogenes are essential for normal cell functions, but when mutated.
They can facilitate the progression of the cell cycle past checkpoints, potentially giving rise to cancer if the resulting cells are able to divide and propagate the mutation. This is distinct from tumor suppressor genes, which code for proteins that negatively regulate the cell cycle and can prevent uncontrolled division when functioning correctly.