Question

1. environmental factors such as radiation, smoking, and viral infections can alter genes that regulate cell division. tumor suppressor genes prevent continuous cell division in adult organisms, but the tumor suppressor gene p53 can be inactivated by smoking tobacco. what is the most likely result of inactivating p53? white blood cells are unable to stop infections dna chains are broken and form more chromosomes cells undergo uncontrolled division lungs become black from smoking

Explanation:

Tumor suppressor genes like p53 prevent continuous cell division. If p53 is inactivated, the control over cell division is lost. White blood cells' inability to stop infections is not related to p53 inactivation. DNA chains forming more chromosomes is not the direct result of p53 inactivation. Lungs becoming black from smoking is a physical change due to smoke particles, not related to gene inactivation. When p53 (a tumor - suppressor gene) is inactivated, the normal regulation of cell division is disrupted, and cells can divide without proper control.

Answer:

Cells undergo uncontrolled division