the dna double helix is composed of two strands of dna; each strand is a polymer of dna nucleotides. each nucleotide consists of a sugar, a phosphate group, and one of four nitrogenous bases. the structure and orientation of the two strands are important to understanding dna replication. drag the labels to their appropriate locations on the diagram below. targets of group 1 can be used more than once.

b is the correct answer

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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.