Nucleic Acid Structure
The DNA that actually codes for a protein's primary structure in eukaryotes is

portions of the gene called exons
the promoter
portions of the gene called introns
the entire gene

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Nucleic Acid Structure
Stem and loop structures are

structures in DNA caused by inverted repeats
proteins that help partially denatured enzymes to recover their native configuration
the bonds between adjacent DNA nucleotides in the same strand
structures at the ends of linear eukaryotic DNA molecules

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