A molecule that helps prevent sharp changes in pH is called a:
Salt
Buffer
Enzyme
Catalyst
The Correct Answer is B
A. Salt: Salts dissociate into ions and affect ionic strength and osmolarity, but they do not primarily prevent sharp pH changes.
B. Buffer: Buffers are substances (weak acid/base pairs) that resist rapid pH changes by neutralizing added acids or bases.
C. Enzyme: Enzymes are biological catalysts that speed chemical reactions; they do not function to stabilize pH.
D. Catalyst: A catalyst accelerates reactions without being consumed but does not inherently prevent pH shifts.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Causing only infections: Microbes can cause infections but do much more than only cause disease.
B. Making us sick: Many microbes are pathogenic, but many are beneficial or neutral; saying they “make us sick” overlooks beneficial roles.
C. Producing vitamins and aiding immunity: Microbes (e.g., gut bacteria) synthesize vitamins like K and some B vitamins and help train and regulate the immune system.
D. Blocking oxygen: Microbes do not generally “block oxygen” as a benefit to humans; this is not a recognized beneficial function.
Correct Answer is B
Explanation
A. Salt: Salts dissociate into ions and affect ionic strength and osmolarity, but they do not primarily prevent sharp pH changes.
B. Buffer: Buffers are substances (weak acid/base pairs) that resist rapid pH changes by neutralizing added acids or bases.
C. Enzyme: Enzymes are biological catalysts that speed chemical reactions; they do not function to stabilize pH.
D. Catalyst: A catalyst accelerates reactions without being consumed but does not inherently prevent pH shifts.
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