CELL DIVISION
CELL DIVISION AND CANCEROUS CELLS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
absence of cyclins in the DNA
|
|
|
Multiple gene mutations on a chromosome of DNA
|
|
|
Uncontrolled cell growth caused by mutations in genes that control the cell cycle.
|
|
|
Presence of genetic defects caused by hereditary disorders.
|
Detailed explanation-1: -Proto-oncogenes are normal genes that, when mutated, become oncogenes-genes that cause a cell to become cancerous.
Detailed explanation-2: -Most cancer-causing DNA changes occur in sections of DNA called genes. These changes are also called genetic changes. A DNA change can cause genes involved in normal cell growth to become oncogenes. Unlike normal genes, oncogenes cannot be turned off, so they cause uncontrolled cell growth.
Detailed explanation-3: -Cancer is a disease in which some of the body’s cells grow uncontrollably. There are many different types of cancer, and each begins when a single cell acquires a genomic change (or mutation) that allows the cell to divide and multiply unchecked.
Detailed explanation-4: -Oncogenes. These turn a healthy cell into a cancerous cell. Mutations in these genes are not known to be inherited.
Detailed explanation-5: -With increasing cell growth, cancer cells spread or infiltrate to involve other organs, displacing normal tissue and severely depleting nutrient and metabolic resources, which results in death either from cancer cachexia or from mechanical disruption of normal organ function.