Scientists Isolate Cells in Various Phases of the Cell Cycle

question 15

Multiple Choice

Scientists isolate cells in various phases of the cell cycle. They find a group of cells that have 1½ times more DNA than G₁ phase cells. The cells of this group are in

• A) the process of cytokinesis.
• B) S phase.
• C) M phase.
• D) the G₂ phase of the cell cycle.

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Definitions:

Testes

The male reproductive glands that produce sperm and testosterone.

Spermatic Cord

A bundle of fibers and tissues forming a cord-like structure that runs through the abdominal region to the testes.

Seminiferous Tubules

Narrow, coiled tubules within the testes where spermatogenesis occurs, producing sperm.

Cremaster Muscles

Muscles that cover the testes, involved in the reflex action of moving the testes closer to the body in cold temperatures or during arousal.