Brendgen Et Al

question 25

Multiple Choice

Brendgen et al.'s (2005) study on aggression in twins found that aggression levels in children are influenced by

• A)heredity only.
• B)environment only.
• C)heredity and environment.
• D)neither heredity nor environment.

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Definitions:

Cell Wall

A rigid layer outside the plasma membrane of the cells of plants, fungi, and some bacteria, providing structural support and protection.

Plasma Membrane

The lipid bilayer that surrounds a cell, controlling the movement of substances in and out of the cell.

Cytoplasm

The gel-like substance inside the cell membrane excluding the nucleus, containing organelles and is the site of most cellular activities.

Chromosomes

Structures within cells that consist of DNA and protein and contain the genes.