AP BIOLOGY

Detailed explanation-1: -Cancer undergoes the cell cycle as any normal cell, but the difference is that they cannot stop after a specific number of cell cycles. They keep on dividing even when there is no space available.. Therefore, from above discussion we know that cancer cells continue to divide even when they are tightly packed.

Detailed explanation-2: -Therefore the answer option ‘cancer cells continue to divide even when they are tightly packed’ is correct.

Detailed explanation-3: -Differences between Cancer Cells and Normal Cells For instance, cancer cells: grow in the absence of signals telling them to grow. Normal cells only grow when they receive such signals. ignore signals that normally tell cells to stop dividing or to die (a process known as programmed cell death, or apoptosis).

Detailed explanation-4: -In cancer, the cells often reproduce very quickly and don’t have a chance to mature. Because the cells aren’t mature, they don’t work properly. And because they divide quicker than usual, there’s a higher chance that they will pick up more mistakes in their genes.

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.