AP BIOLOGY

Detailed explanation-1: -Cancer is the result of unchecked cell division caused by a breakdown of the mechanisms regulating the cell cycle. The loss of control begins with a change in the DNA sequence of a gene that codes for one of the regulatory molecules.

Detailed explanation-2: -Disruption of normal regulation of the cell cycle can lead to diseases such as cancer. When the cell cycle proceeds without control, cells can divide without order and accumulate genetic errors that can lead to a cancerous tumor .

Detailed explanation-3: -Conclusion. Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death.

Detailed explanation-4: -The loss of cell cycle control begins with a DNA sequence change of a gene that codes for one of the regulatory molecules, known as a mutation. Faulty instructions lead to a protein that does not function normally. Each successive cell division will give rise to daughter cells with even more accumulated damage.

Detailed explanation-5: -Mitosis occurs infinitely. The cells never die in cancer, as cancer cells can utilize telomerase to add many telomeric sections to the ends of DNA during DNA replication, allowing the cells to live much longer than other somatic cells. [3] With this mechanism, cancer cells that usually die simply continue to divide.