What angle separates the hydrogen atoms in a water molecule?
105°.
What is a dipole?
A molecule with electrical charge distributed asymmetrically across its structure.
What accepts a hydrogen bond from a partially unshielded hydrogen in water’s hydrogen-bond definition?
An unshared electron pair on another oxygen or nitrogen atom.
How many other water molecules associate with each liquid water molecule on average?
3.5 other water molecules.
What regions characterize most amphipathic biomolecules?
Charged or polar regions and hydrophobic regions.
Where do proteins place hydrophobic side chains?
In their interior.
Which forces are strongest in holding molecules together?
Covalent bonds.
What is a salt bridge in biomolecules?
An electrostatic interaction between oppositely charged groups within or between biomolecules.
What holds the two strands of the DNA double helix together?
Noncovalent interactions.
What stabilizes Watson–Crick base pairs in the DNA double helix?
Hydrogen bonds.
Answer 10 questions on Water and Biomolecular Interactions.
1. At 25°C, a salt is placed in a medium with a dielectric constant of 24.3 rather than water. Which statements correctly describe the comparison?
2. A liquid contains water molecules forming hydrogen bonds. Which statements correctly describe these bonds?
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