Which of the following can denature a hydrogen bond?
pH less than 6.8.
pH less than 7.8
pH between 7.34 and 7.45.
pH between 6.8 and 7.8
The Correct Answer is A
A. pH less than 6.8: Hydrogen bonds within proteins and nucleic acids are sensitive to strong acidic conditions. When pH falls below 6.8, the high concentration of hydrogen ions disrupts the weak bonds that stabilize molecular structures, leading to denaturation.
B. pH less than 7.8: A pH slightly below 7.8 is still within a physiologically tolerable range and does not usually disrupt hydrogen bonding. The structure of most proteins remains intact in this environment, so denaturation is unlikely here.
C. pH between 7.34 and 7.45: This range represents the normal physiologic blood pH. Within this range, hydrogen bonds remain stable, supporting the proper folding and function of proteins and enzymes.
D. pH between 6.8 and 7.8: This range includes near-normal physiological pH and only mild deviations into acidosis or alkalosis. While extremes outside this range can damage hydrogen bonds, values here are not usually severe enough to cause denaturation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Pinocytosis: Pinocytosis is a form of endocytosis in which the cell non-selectively engulfs extracellular fluid and dissolved solutes into small vesicles. This allows the cell to absorb nutrients and other molecules from the surrounding environment without targeting specific substances.
B. Receptor-mediated endocytosis: This process is selective, relying on receptors to bind specific molecules before internalization. It is not used for non-selective uptake of extracellular fluid.
C. Phagocytosis: Phagocytosis involves the engulfment of large particles, such as pathogens or cell debris, rather than fluids. It is not the main mechanism for absorbing soluble nutrients.
D. Exocytosis: Exocytosis is the process of exporting materials from the cell via vesicle fusion with the plasma membrane. It is the opposite of endocytosis and does not bring extracellular fluid into the cell.
Correct Answer is B
Explanation
A. Complex tissue: While tissues are made up of similar cells working together, a complex tissue is not composed of multiple tissue types and therefore does not perform the broader functions of an organ.
B. Organ: An organ is composed of two or more tissue types that work together to perform specific functions, such as the heart pumping blood or the liver detoxifying substances. This combination of tissues allows organs to carry out specialized physiological tasks.
C. Complex cell: Cells are the basic structural and functional units of life, but a single cell, no matter how complex, does not consist of multiple tissue types.
D. Organ system: An organ system is a higher-level organization consisting of multiple organs that coordinate to perform broad physiological functions, rather than being a single structure composed of multiple tissue types.
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