Question

base your answer to this question on the diagram shown to the right and on your knowledge of biology. structures 3 and 4 are held together by______.
weak peptide bonds
strong hydrogen bonds
weak hydrogen bonds
strong peptide bonds

Explanation:

The diagram represents a DNA structure. In DNA, the nitrogenous bases (represented as 3 and 4) are held together by hydrogen bonds. Hydrogen bonds are relatively weak compared to covalent bonds like peptide bonds (which are found in proteins, not DNA).

Answer:

weak hydrogen bonds