Which of the following is not one of the major groups of organic substances in the human body?
Proteins
Salts
Lipids
Nucleic acids
The Correct Answer is B
A. Proteins: Proteins are one of the four major classes of organic (carbon-based) molecules in the body.
B. Salts: Salts (like NaCl) are inorganic compounds because they typically do not contain carbon-hydrogen bonds.
C. Lipids: Lipids (fats) are a major group of organic substances essential for cell membranes and energy.
D. Nucleic acids: DNA and RNA are organic molecules that carry genetic information.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. a constant state maintained by living and nonliving organisms: Nonliving organisms do not maintain homeostasis.
B. a state of relative constancy: Homeostasis is not a "fixed" point but a dynamic equilibrium where variables fluctuate within a narrow, healthy range.
C. adaptation to the external environment: This is a broader biological concept; homeostasis is specifically about maintaining the internal environment.
D. changes in body temperature: This is just one example of a homeostatic variable, not the definition of the concept itself.
Correct Answer is B
Explanation
A. fluid balance and waste removal: While the system does move waste, "waste removal" is more a function of the urinary and digestive systems.
B. fluid balance and immunity: The lymphatic system returns leaked tissue fluid to the blood (fluid balance) and houses white blood cells that fight infection (immunity).
C. immunity and waste removal: This misses the critical role of returning fluid to the circulatory system to prevent edema.
D. waste removal and gas exchange: Gas exchange is strictly the function of the respiratory and circulatory systems.
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