Nucleic Acid Structure
According to base pairing rules the bases of one strand match-up with the bases of the second strand of DNA and the two strands are said to be

complementary
identical
none of these
oppositely charged

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Nucleic Acid Structure
Stem and loop structures are

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

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