One type of weak chemical interaction occurs when two molecules having partial electrical charges of opposite polarity form an intermolecular attraction. These interactions are called:
A. ionic bonds.
B. hydrogen bonds.
C. hydrophobic interactions.
D. van der Waals interactions.
E. covalent bonds.
Hydrophobic interactions:
A. arise from the tendency of nonpolar molecules to exclude water in solution.
B. destabilize proteins.
C. destabilize the base-stacking interactions of DNA helices.
D. occur between molecules having partial charges.
E. are a function of the repulsive forces generated when atoms are closer than their van der Waals radii.
Which of the following is a difference between weak chemical bonds and covalent or ionic bonds?
A. Weak chemicals bonds are harder to break.
B. Weak chemical bonds are shorter than covalent or ionic bonds.
C. Weak chemical bonds are transient compared to covalent and ionic bonds.
D. Weak chemical bonds are not particularly useful in biological systems.
E. Weak chemical bonds require more energy to break than covalent and ionic bonds.
Which of the following is not true of van der Waals interactions?
A. The interaction depends on the distance between atoms.
B. Attractive and repulsive forces are balanced at the van der Waals radii for each atom.
C. Repulsive interactions arise when atoms are separated by a distance equal to the sum of their combined van der Waals radii.
D. Atoms that are farther apart than the sum of their combined van der Waals radii do not experience van der Waals forces.
E. All of these statements are true.
Which of the following interactions is not considered to be a weak chemical bond?
A. hydrogen bonds
B. van der Waals interactions
C. hydrophobic interactions
D. covalent bonds
E. All of these choices are considered to be weak chemical bonds.
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