SCIENCE
CELL BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
cause cells to continue to grow
|
|
|
regulate and stop the growth of most cells
|
|
|
produce a defect in a gene called p53
|
|
|
produce contact with other cells.
|
Detailed explanation-1: -Cancer cells do not respond to signals that regulate cell GROWTH. Cancer cells form a mass of cells called a TUMOR. Cancer cells may break loose and SPREAD throughout the body. Cancer cells form tumors in other tissues by METASTASIS.
Detailed explanation-2: -In cancer cells, the molecules that decide whether a cell should repair itself are faulty. For example, a protein called p53 usually checks if the cell can repair its genes, or if the cell should die. But many cancers have a faulty version of p53, so they don’t repair themselves properly.
Detailed explanation-3: -In a given day, the body’s cells send and receive billions of signals. In some cancer cells, the signals sent to regulate growth or initiate apoptosis get short-circuited, resulting in rapid cell growth that may lead to tumors.
Detailed explanation-4: -Cancer cells do not respond to the signals and safeguards that are in place. Because cancer cells don’t respond appropriately, they grow uncontrollably and can eventually damage the tissues around them. If cancer cells continue to grow, they will eventually form a mass called a tumor.
Detailed explanation-5: -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. Faulty instructions lead to a protein that does not function as it should.