What aspects of the structure of DNA are explained by this model? A. Paired nucleotides are held together by covalent bonds.
B.
Adenine is paired with thymine, and guanine is paired with cytosine.
C. Paired nucleotides are held together by hydrogen bonds.
D. The two strands of DNA each have phosphate-sugar backbones
E. The numbers of each nucleotide determine genetic information

the correct choice is i and iv.

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hi my name is ashlynn and im 15

these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.