16 Questions
What type of bond is stronger than most other intermolecular forces but much weaker than both ionic and covalent bonds?
Hydrogen bond
What type of interaction stabilizes the a-helical structures of proteins and holds together the two strands of DNA?
Hydrogen bonds
What is the attraction of the partially positive end of one highly polar molecule for the partially negative end of another highly polar molecule called?
Hydrogen bond
Which type of bond is characterized by the attraction between the partially positive end (H) of one highly polar molecule and the partially negative end of another highly polar molecule?
Hydrogen bond
What type of bond is highly directional and strong when the atoms involved are collinear?
Hydrogen bond
Which force is stronger than most other intermolecular forces but much weaker than both the ionic and covalent bonds?
Hydrogen bond
Which force stabilizes the a-helical structures of proteins and holds together the two strands of DNA?
Hydrogen bond
What are Van der Waal’s forces also called?
London Dispersion Forces
Which type of molecules are held together by Van der Waal’s forces?
Non-polar molecules
When are Van der Waal’s forces much more important?
As the pressure increases
What do hydrophobic interactions involve?
Attractions between nonpolar molecules
What do hydrophobic interactions provide in biological systems?
Stabilization of molecules
What do non-covalent bonds do in biological systems?
Stabilize molecules
What do reversible interactions between substrates and enzymes demonstrate?
Non-covalent bonding
What do hydrophobic interactions repel in a polar environment?
Polar molecules
What do Van der Waal’s forces contribute to the stability of in biological systems?
Lipids
Study Notes
Hydrogen Bonds
- Hydrogen bonds are stronger than most other intermolecular forces but much weaker than both ionic and covalent bonds.
- They stabilize the α-helical structures of proteins and hold together the two strands of DNA.
- Hydrogen bonds are characterized by the attraction between the partially positive end (H) of one highly polar molecule and the partially negative end of another highly polar molecule.
Hydrogen Bonding
- Hydrogen bonding is the attraction of the partially positive end of one highly polar molecule for the partially negative end of another highly polar molecule.
- It is highly directional and strong when the atoms involved are collinear.
Van der Waal's Forces
- Van der Waal's forces are also called London dispersion forces.
- They are weak intermolecular forces that hold together non-polar molecules.
- Van der Waal's forces are more important in non-polar molecules or in molecules with a large number of atoms.
Hydrophobic Interactions
- Hydrophobic interactions involve the repulsion of non-polar molecules or groups from a polar environment.
- They provide a stabilizing force in biological systems by allowing non-polar molecules to aggregate and exclude water.
- Hydrophobic interactions are an important aspect of non-covalent bonds in biological systems.
Non-Covalent Bonds
- Non-covalent bonds, including hydrogen bonds, Van der Waal's forces, and hydrophobic interactions, are important for the structure and function of biological molecules.
- They are responsible for the reversible interactions between substrates and enzymes.
Biological Systems
- Non-covalent bonds contribute to the stability of biological structures, such as proteins and DNA, and are essential for the proper functioning of biological systems.
Test your knowledge of molecular interactions with this quiz. Learn about intra-molecular and inter-molecular bonds, including covalent, ionic, hydrogen, and hydrophobic interactions. Perfect for students of biochemistry and related fields.
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