Questions: In Figure 1, horizontal lines in the double helix represent: Base pairs Codons Individual bases Nothing at all, they just support the metal model designed by Watson and Crick

In Figure 1, horizontal lines in the double helix represent: Base pairs Codons Individual bases Nothing at all, they just support the metal model designed by Watson and Crick

Solution

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The answer is the first one: base pairs.

Explanation for each option:

  • Base pairs: This is correct. In the double helix structure of DNA, the horizontal lines represent the pairs of nucleotides (adenine-thymine and guanine-cytosine) that form the rungs of the helical ladder.
  • Codons: This is incorrect. Codons are sequences of three nucleotides that correspond to specific amino acids or stop signals during protein synthesis, not the horizontal lines in the double helix.
  • Individual bases: This is incorrect. Individual bases are the nucleotides themselves (adenine, thymine, guanine, cytosine), but the horizontal lines in the double helix represent pairs of these bases.
  • Nothing at all, they just support the metal model designed by Watson and Crick: This is incorrect. The horizontal lines in the double helix model represent the base pairs, which are a fundamental aspect of the DNA structure.

Summary: The horizontal lines in the double helix represent base pairs.

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