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A-Level Biology OCR A

Hydrogen Atom Bonds Electronegative Slight Charge Molecule Explain

Hydrogen bonds are attractions between a partially positive hydrogen atom (linked to F, N, or O) and a nearby electronegative atom, vital for structures like DNA and proteins.

A hydrogen bond is an electromagnetic attraction between a partially positive hydrogen atom (bonded to F, N, or O) and another nearby electronegative atom. These bonds are crucial for holding together biological macromolecules like DNA and proteins.

Front Explain what a hydrogen bond is, what types of atoms it can join together and where they occur in biology.
Back Hydrogen bonds
  • A hydrogen bond is the electromagnetic attraction created between a partially positively charged hydrogen atom attached to a highly electronegative atom (F/N/O) and another nearby electronegative atom.
  • Hydrogen bonds are continually made and broken. 
  • In water the slight positive charge of a hydrogen atom of one molecule is attracted to the slight negative charge of an adjacent oxygen atom from another molecule

  • Hydrogen bonds are responsible for holding together DNA, proteins, and other macromolecules.

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