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Biochemistry: Hydrogen Bonds and Biomolecules

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Biochemistry: Hydrogen Bonds and Biomolecules

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Questions and Answers

Why do non-polar molecules poorly dissolve in water?

Non-polar molecules attract water molecules due to hydrogen bonding.

Non-polar molecules have a high affinity for water molecules due to ionic interactions.

Non-polar molecules form covalent bonds with water molecules.

Non-polar molecules repel water molecules due to hydrophobic interactions. (correct)

Which type of interaction is responsible for the hydrophobic effect in biological systems?

Van der Waals interactions (correct)

Ionic interactions

Covalent bonds

Hydrogen bonding

What is the main consequence of ice having a lower density than liquid water?

Ice floats on water surfaces. (correct)

Ice cannot float on water surfaces.

Ice has a higher entropy than liquid water.

Ice does not form a regular lattice structure.

Which type of forces dominate at very short distances in van der Waals interactions?

Repulsive forces Signup and view all the answers

What is the significance of hydrogen bonds between complementary bases of DNA?

Stabilizes the DNA molecule's double-helix structure Signup and view all the answers

What type of solute molecules dissolve better at low temperatures, according to the text?

Polar molecules Signup and view all the answers

What phenomenon describes the dispersion of lipid molecules in a solution with their nonpolar tails surrounded by ordered water molecules?

Micelle formation Signup and view all the answers

Which property of solutions like boiling point, melting point, and osmolarity do not strongly depend on the nature of the dissolved substance?

Colligative properties Signup and view all the answers

What is the term used for the effect where hydrophobic groups are sequestered from water by an ordered shell of water molecules to increase entropy?

Hydrophobic effect Signup and view all the answers

What process involves highly ordered water molecules forming 'cages' around hydrophobic alkyl chains?