On Average,a U

question 4

Multiple Choice

On average,a U.S.household has at least one television turned on for how many hours a day?

• A)two
• B)five
• C)seven
• D)fifteen

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Definitions:

Cell Membrane

A biological membrane that separates the interior of all cells from the outside environment, controlling the movement of substances in and out of cells.

Nucleus

The central and most important part of an atom, containing protons and neutrons, or the control center of a cell containing the cell's DNA.

Nuclear Membrane

A double lipid bilayer that encloses the nucleus in eukaryotic cells, separating the contents of the nucleus from the cytoplasm.

Gene Therapy

A medical treatment that involves altering the genes inside a patient's cells to treat or prevent disease.