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

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

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Nucleic Acid Structure
Stem and loop structures are

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

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