Questions: The double helix structure of or DNA is held together by - Covalent bonds - Ionic bonds - Metal to metal bonds - Hydrogen bonds

The double helix structure of or DNA is held together by - Covalent bonds - Ionic bonds - Metal to metal bonds - Hydrogen bonds
Transcript text: The double helix structure of or DNA is held together by - Covalent bonds - Ionic bonds - Metal to metal bonds - Hydrogen bonds
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Solution

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The answer is the fourth one (Hydrogen bonds): the double helix structure of DNA is held together by hydrogen bonds.

Explanation for each option:

  1. Covalent bonds: Incorrect. Covalent bonds are strong bonds that hold the atoms within each DNA strand together, forming the sugar-phosphate backbone, but they do not hold the two strands of the double helix together.
  2. Ionic bonds: Incorrect. Ionic bonds involve the electrostatic attraction between oppositely charged ions, which is not the primary force holding the DNA double helix together.
  3. Metal to metal bonds: Incorrect. Metal to metal bonds are not relevant to the structure of DNA.
  4. Hydrogen bonds: Correct. Hydrogen bonds are the weak bonds that form between the nitrogenous bases of the two DNA strands, holding the double helix structure together. Specifically, adenine pairs with thymine via two hydrogen bonds, and cytosine pairs with guanine via three hydrogen bonds.

Summary: The double helix structure of DNA is held together by hydrogen bonds.

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