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NAS 2 Challenge Exam Study Guide/28 Q’s and A’s
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NAS 2 Challenge Exam Study Guide/28 Q’s and A’sLevels of Organization: - -chemical, cellular, tissue, organ, organ system,
organismal
-Survival Needs - -nutrients, oxygen, water, appropriate temperature,
atmospheric pressure
-Requirements for Life - -maintaining boundaries, movement,
responsiveness, digestion, metabolism, excretion, reproduction, growth
-Homeostasis - -ability to maintain relatively stable internal conditions even
though the outside world changes continuously
-Basic Mechanisms - -receptor, control center, effector
-Negative Feedback Mechanisms - -most common homeostasis control
mechanism; the net effect is that the original output of the system shuts off
the original stimulus or reduces the intensity
-Positive Feedback Mechanisms - -cause the level of a variable to change in
the same direction as the an initial change
-Ionic bond - -chemical bond between atoms formed by the transfer of
electrons
-Covalent bond - -shared electrons between atoms
-Hydrogen bond - -hydrogen shares a pair of electrons with another atom
-Nonpolar - -electrically balanced molecules
-Polar - -non symmetrical molecules that contain electrically unbalanced
atoms (water)
-Decomposition - -molecule is broken down
-Synthesis - -a chemical reaction in which larger, more complex molecule
are formed from smaller ones
-Exchange - -bonds are made and broken
-Organic Compounds - -contain carbon
-Polymer - -chainlike molecules consisting of many repeated units
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