Hydrogen bonds function to
hold carbohydrates and DNA in their 3-D shape
hold proteins and DNA in their 3-D shape
hold carbohydrates and triglycerides in their 3-D shape
hold proteins and RNA in their 3-D shape
The Correct Answer is B
A. Hold carbohydrates and DNA in their 3-D shape: Carbohydrates rely more on glycosidic bonds and branching patterns for their structure, while hydrogen bonding has only a minor role. DNA, however, depends heavily on hydrogen bonds between nitrogenous bases for stability.
B. Hold proteins and DNA in their 3-D shape: Proteins maintain their secondary and tertiary structures through hydrogen bonds between amino acid side chains and peptide backbones. DNA depends on hydrogen bonds between complementary bases, which provide stability while still allowing strand separation during replication.
C. Hold carbohydrates and triglycerides in their 3-D shape: Triglycerides are primarily stabilized by ester bonds and hydrophobic interactions. Carbohydrates do not depend significantly on hydrogen bonds for their three-dimensional organization.
D. Hold proteins and RNA in their 3-D shape: While RNA can fold into complex structures stabilized partly by hydrogen bonds, proteins and DNA are more classically described as relying on hydrogen bonding for maintaining stable 3-D conformations.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. The cells will shrink at first, but will later reach equilibrium with the surrounding solution and return to their original condition: If the solute cannot cross the membrane, the cells cannot regain water through solute equilibration, so they will not return to their original size.
B. The cells will show no change due to diffusion of both solute and solvent: In a hypertonic solution where the solute is impermeable, only water can move, so diffusion of solute does not occur and the cell will be affected by water loss.
C. The cells will lose water and shrink: Water moves out of the cell by osmosis to balance the higher extracellular solute concentration. The loss of water causes the cells to shrink, a process called crenation.
D. The cells will swell and ultimately burst: Swelling occurs in a hypotonic solution where water enters the cell due to lower solute concentration outside. In a hypertonic solution, the opposite occurs, so bursting does not happen.
Correct Answer is D
Explanation
A. All the isotopes of the same element react differently: Isotopes generally exhibit the same chemical behavior because they have the same number of protons and electrons, which determine chemical reactivity.
B. Isotopes occur only in the heavier elements: Isotopes are found in both light and heavy elements; they are variations of an element with differing numbers of neutrons, not limited to heavy elements.
C. All the isotopes of an element have the same number of neutrons but differing numbers of electrons: Isotopes have the same number of protons (and electrons if neutral) but differ in neutron number.
D. Isotopes of the same element have the same atomic number but differ in their atomic mass (weight) number: Isotopes share the same number of protons (atomic number) but have different numbers of neutrons, which changes their mass number.
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