A solution maintains a pH of 4 even when some base is added to it. This means the solution is
water
a buffer
an alcohol
organic
The Correct Answer is B
A. Water: Pure water has a neutral pH of around 7 and does not resist changes in pH when acids or bases are added, so it does not function as a stabilizing solution in this case.
B. A buffer: A buffer is a solution that resists changes in pH by neutralizing added acids or bases. The ability of the solution to maintain a pH of 4 despite the addition of a base indicates it is functioning as a buffer system.
C. An alcohol: Alcohols are organic compounds containing hydroxyl groups, but they do not regulate pH levels or provide stability against pH changes in solution.
D. Organic: Being organic only means the compound is carbon-based, which does not automatically imply it has buffering capacity or pH stability.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Mitochondria: Prokaryotic cells do not contain mitochondria. Instead, they generate energy through processes that occur across the plasma membrane. They are found exclusively in eukaryotic cells and are absent in prokaryotes.
B. Lysosomes: Lysosomes are membrane-bound organelles found only in eukaryotic cells. Prokaryotes lack these structures and instead rely on enzymes within the cytoplasm for breakdown processes.
C. Ribosomes: Ribosomes are present in prokaryotes and eukaryotes, serving as the site of protein synthesis. In prokaryotes, they are smaller (70S type) but functionally equivalent to those in eukaryotes.
D. All of the above: This is incorrect because prokaryotes do not contain mitochondria or lysosomes.
Correct Answer is A
Explanation
A. protein only: Prions are infectious agents made entirely of misfolded proteins without nucleic acids. They propagate by inducing normal cellular proteins to misfold, leading to neurodegenerative diseases.
B. an RNA surrounded by a protein capsid: This describes a typical RNA virus, not a prion. Viruses contain nucleic acids, while prions lack them completely.
C. circular RNA only: Circular RNA molecules are found in viroids, which infect plants, but prions are distinct as they are composed solely of protein.
D. circular DNA only: Circular DNA is present in some viruses and plasmids, but prions do not contain DNA or any form of nucleic acid.
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