Question at position 23 Cancer is unregulated apoptosis.an organ that becomes malignant.a metastatic cell.regulated cell division.unregulated cell division.Clear my selection

Question

BlackTom AI · Accepted Answer

Cancer is characterized by unregulated cell division. Relevant knowledge: cancer is a group of diseases in which cells grow and divide uncontrollably, invade nearby tissues, and can spread (metastasize) to other parts of the body. Key concepts include cell cycle regulation, proliferation signals, apoptosis (programmed cell death), malignancy, and metastasis.

Step-by-step reasoning:
1. Define cancer: abnormal cells that have lost normal growth control and proliferate without the usual regulatory checks. The primary hallmark is sustained, unregulated proliferation.
2. Compare each option to that definition:
   - "unregulated apoptosis.": Apoptosis is programmed cell death; unregulated (excessive) apoptosis causes tissue loss and degenerative conditions, not cancer. Cancer cells often evade apoptosis rather than have too much of it.
   - "an organ that becomes malignant.": An organ cannot itself be malignant; malignancy describes tissues or tumors composed of malignant cells. The organ may contain a malignant tumor, but that phrase is imprecise and not the definition of cancer.
   - "a metastatic cell.": Metastasis describes the spread of cancer cells to distant sites. A metastatic cell is a consequence or stage of cancer, not the core defining process that creates cancer.
   - "regulated cell division.": This is the opposite of cancer; regulated division is normal tissue homeostasis.
   - "unregulated cell division.": Matches the central feature of cancer—cells dividing without normal regulatory controls.

Why the correct answer is correct: Cancer arises when the mechanisms that normally regulate the cell cycle (growth signals, checkpoints, tumor suppressors, apoptosis) fail, allowing continuous and uncontrolled cell proliferation. This unregulated division produces tumors and increases the chance of invasion and metastasis.

Why other options are incorrect: explained above—either describe different processes (apoptosis), stages (metastasis), or are the opposite (regulated division) or imprecise phrasing (organ becomes malignant).

Conclusion: The correct choice is "unregulated cell division." This matches the provided answer.

Question at position 23 Cancer is unregulated apoptosis.an organ that becomes malignant.a metastatic cell.regulated cell division.unregulated cell division.Clear my selectionSingle choice

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