Below the Skin Are "Stem Cells" That Divide, with Some

question 1

Multiple Choice

Below the skin are "stem cells" that divide, with some cells continuing the stem cell line and others being pushed toward the surface to flatten and die and be sloughed off. In the bone marrow other stem cells produce erythrocytes that lose their nucleus and function for a few months in the bloodstream before they too die. Such "dead end" cells that reproduce no further

• A) leave the cell cycle in a G₀ phase, which immediately follows telophase.
• B) leave the cell cycle in a G₃ phase, which immediately follows G₂.
• C) halt in the midst of the S phase.
• D) continually cycle but simply fail to go through cytokinesis.
• E) reverse from G₂ to G₁.

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