Question

which of these does not undergo cell division? *

• viruses
• brocolli cells
• bacterial cells
• skin cells

what is cancer? *

• cancer is a disease that occurs when the cell cycle is not longer regulated
• cancer is a disease that occurs when mitosis does not occur
• cancer is a disease that occurs when binary fission is incomplete
• cancer is a disease that occurs when cytokinesis occurs improperly

Explanation:

Analyze cell division in different entities

To determine which entity does not undergo cell division, we examine each option:

• Broccoli cells are eukaryotic plant cells that divide via mitosis.
• Bacterial cells are prokaryotes that divide via binary fission.
• Skin cells are eukaryotic animal cells that divide via mitosis.
• Viruses are non-cellular entities. They lack cellular structures and metabolic machinery, meaning they cannot undergo cell division. Instead, they replicate by hijacking a host cell's machinery.

Define cancer and its relationship to the cell cycle

To identify the correct definition of cancer, we evaluate the options based on cell biology:

• The cell cycle is tightly regulated by various checkpoints to ensure orderly growth and division.
• When regulatory mechanisms fail, cells divide uncontrollably.
• This uncontrolled cell division due to a breakdown in regulation is the hallmark of cancer.
• Therefore, cancer is a disease that occurs when the cell cycle is no longer regulated.

Answer:

Question 1

• (A) Viruses (Correct answer)
• (B) Brocolli Cells
• (C) Bacterial Cells
• (D) Skin Cells

Question 2

• (A) Cancer is a disease that occurs when the cell cycle is no longer regulated (Correct answer)
• (B) Cancer is a disease that occurs when mitosis does not occur
• (C) Cancer is a disease that occurs when binary fission is incomplete
• (D) Cancer is a disease that occurs when cytokinesis occurs improperly