An intermolecular force of attraction X is relatively stronger than the other intermolecular forces. It stabilizes alpha-helix and beta-pleated sheets of proteins. The double helical structure of DNA is also stabilized by this force of attraction. Identify X:
Correct answer: B. Hydrogen bonding
- A. Van Der Waals Forces
- B. Hydrogen bonding
- C. Ionic interactions
- D. Dipole dipole attraction
Explanation
Option B is correct, as H-bonding stabilizes DNA structure as it is between bases in a complementary base pair as well as it stabilizes the secondary structures, such as alpha-helix and beta-pleated sheet. It is also stronger than the other intermolecular attraction, which is Van der Waals forces.
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Chemical bonding explains molecular shape through VSEPR theory and distinguishes sigma bonds from pi bonds. Questions involve hybridization, bond angles, dipole moment and bond energy, including how electron-pair repulsion determines geometry and how bond polarity differs from the overall polarity of a molecule.
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