Cyclins Modulate the Progression of Cells Through the Cell Cycle

question 47

Multiple Choice

Cyclins modulate the progression of cells through the cell cycle by

• A)directly activating G proteins.
• B)inducing synthesis of constitutively active forms of growth cell receptors.
• C)activating protein kinases that are critical regulators of cell division.
• D)degrading histones.
• E)increasing the production of DNA polymerases.

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Definitions:

Amniocentesis

A procedure in which fluid is withdrawn from a woman’s abdomen and analyzed for abnormalities in the fetus.

Downs Syndrome

A genetic disorder caused by the presence of all or part of a third copy of chromosome 21, characterized by physical growth delays and mild to moderate intellectual disability.

Amniotic Sac

A fluid-filled sac that surrounds and protects a fetus in the uterus during pregnancy.

Abortion

The medical termination of a pregnancy before the fetus is capable of independent life.