An acid with a pH of 6 has _________ hydrogen ions than pure, distilled water.
100-fold more
10-fold fewer
100-fold fewer
10-fold more
The Correct Answer is D
A. 100-fold more: A 100-fold difference corresponds to a change of 2 pH units, but the pH difference here is only 1 unit (from 7 to 6).
B. 10-fold fewer: A lower pH indicates higher hydrogen ion concentration, not fewer.
C. 100-fold fewer: This also suggests a lower hydrogen ion concentration, which contradicts the fact that a pH of 6 is more acidic than neutral water.
D. 10-fold more: pH is a logarithmic scale, so each unit change represents a tenfold change in hydrogen ion concentration. A pH of 6 has ten times more H⁺ ions than neutral water at pH 7.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Secondary structure: The secondary structure of a protein involves local folding patterns of the polypeptide backbone, including alpha helices and beta sheets, stabilized by hydrogen bonds between backbone atoms. The coiling into an alpha helix is a classic example of this level.
B. Primary structure: The primary structure is the linear sequence of amino acids in the polypeptide chain, without any folding or coiling.
C. Tertiary structure: Tertiary structure refers to the overall three-dimensional folding of a single polypeptide chain due to interactions between side chains, not the coiling of the backbone.
D. Quaternary structure: Quaternary structure arises when multiple polypeptide chains or subunits come together to form a functional protein complex, beyond the level of alpha helix formation.
Correct Answer is C
Explanation
A. Cholesterols: Cholesterol is a lipid molecule involved in cell membrane structure and as a precursor for steroid hormones, not as a catalyst for biochemical reactions.
B. Triglycerides: Triglycerides are fats used primarily for energy storage and insulation, and they do not function as enzymes.
C. Proteins: Most enzymes are proteins composed of amino acids. Their three-dimensional structure allows them to bind substrates and catalyze biochemical reactions efficiently, making them essential for metabolic processes.
D. Carbohydrates: Carbohydrates serve as energy sources and structural molecules but do not act as enzymes to catalyze reactions.
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