Final answer:
The differences between cancer cells and normal cells include lack of contact inhibition, indefinite division, failure to undergo normal apoptosis.Therefore, all of the options listed (a, b, c, d) correctly describe how cancer cells differ from normal cells.
Step-by-step explanation:
Cancer cells differ from normal cells in several significant ways. One fundamental difference is that cancer cells lack contact inhibition. In contrast to normal cells, which stop dividing once they form a complete layer (due to contact inhibition), cancer cells do not heed this signal and continue to proliferate, leading to a disorganized mass of cells. Additionally, cancer cells can stimulate the growth of new blood vessels, a process known as angiogenesis, which supplies the tumor with nutrients and oxygen. Furthermore, cancer cells exhibit characteristics such as immortality, meaning they can divide without limitations, unlike normal cells which have a finite number of divisions.
Cancerous growths occur due to a loss of regulation in the cell cycle, and these abnormal cells can invade adjacent tissues and metastasize to different locations within the body. As the cancer cells divide unchecked, they can also form tumors which consume resources and disrupt the normal functions of the body, potentially leading to lethal outcomes.
To summarize, the correct answer to the question regarding how cancer cells differ from normal cells is 'e. All of the above are correct'. Cancer cells are characterized by continuous division despite contact with other cells, the ability to live indefinitely, not undergoing the normal process of apoptosis, and the ability to induce the development of new blood vessels.