In the accompanying image, a nucleotide is indicated by the letter _____.

Double-stranded DNA contains definite elements marked from A to D. Letter A marks a full turn of DNA. Letter B marks a chemical compound, which is a structural element of DNA. Letter C marks two chains of DNA and the bonds between them. Letter D marks one chain of the DNA.

A
D
C
B

1 answer

Based on your description, it seems that the letters correspond to various components and structures within a double-stranded DNA molecule.

  • Letter A marks a full turn of DNA, indicating the helical structure.
  • Letter B marks a chemical compound that is a structural element of DNA, which is likely referring to the nucleotide components such as phosphate, sugar, or the nitrogenous bases.
  • Letter C marks two chains of DNA and the bonds between them, which refers to the complementary strands and the hydrogen bonds connecting them.
  • Letter D marks one chain of the DNA, indicating a single DNA strand.

If the letter representing a nucleotide is to be identified, it would most likely be B, as it denotes a chemical compound, which aligns with the structural components of a nucleotide (the sugar, phosphate, and nitrogenous base).