Question

cancer is the result of

cells which have lost the ability to reproduce
cells which create working tissues
uncontrolled cell division
cells which grow normally but no longer function correctly

question 17

identify the following steps in the order shown (a, b, c, d) - which is not necessarily the correct sequence in the cell cycle.
metaphase, interphase, cytokinesis, prophase
metaphase, prophase, telophase, anaphase
prophase, telophase, anaphase, metaphase
anaphase, telophase, interphase, metaphase

Explanation:

Cancer is characterized by uncontrolled cell division. In normal cells, there are regulatory mechanisms that control the cell cycle (the process of cell growth and division). When these mechanisms are disrupted (often due to genetic mutations), cells can divide uncontrollably, forming tumors.

• Option a: Cells that have lost the ability to reproduce would not cause cancer. Cancer cells are often highly proliferative.
• Option b: Cells creating working tissues is a normal process (e.g., during development or tissue repair) and not related to cancer.
• Option c: Uncontrolled cell division is the hallmark of cancer. Cancer cells do not respond to the normal signals that regulate the cell cycle.
• Option d: Cells growing normally but not functioning correctly (e.g., due to some functional impairment) is not the cause of cancer. Cancer is primarily about abnormal cell division.

Answer:

C. Uncontrolled cell division