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 A
Explanation
A. Cell walls: Peptidoglycan is the main structural component of bacterial cell walls, providing rigidity and shape while protecting against osmotic pressure. It is especially thick in Gram-positive bacteria and thinner in Gram-negative ones.
B. Cell membranes: The bacterial cell membrane is composed of a phospholipid bilayer with proteins for transport and signaling, but it does not contain peptidoglycan.
C. Capsules: Capsules are made of polysaccharides or polypeptides that help bacteria evade the immune system, but they lack peptidoglycan.
D. Slime layers: Slime layers, like capsules, consist of polysaccharides and serve mainly for adhesion and protection, not structural rigidity from peptidoglycan.
E. Inclusions: Inclusions are storage sites for nutrients such as glycogen, sulfur, or polyphosphate, and they do not involve peptidoglycan in their structure.
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.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.