Pangaea Is

question 60

Multiple Choice

Pangaea is

• A) the component of plate tectonics that was formerly called continental drift.
• B) the combined fossil record of ancient species.
• C) an ancient supercontinent formed from the major landmasses that exist today as separate continents.
• D) the result of natural selection.

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Definitions:

Basement Membrane

A thin, fibrous structure that lies underneath epithelial cells, providing support and anchorage, and acting as a barrier against the spread of cells.

Gap Junction

Junction between cells formed by the joining of two adjacent plasma membranes; it lends strength and allows ions, sugars, and small molecules to pass between cells.

Adhesion Junction

Junction between cells in which the adjacent plasma membranes do not touch but are held together by intercellular filaments attached to buttonlike thickenings.

Tight Junction

A complex of proteins in the cell membrane that creates a watertight seal between cells, preventing leakage of extracellular fluid.