Nucleic Acid Structure
In DNA sequencing, the primer

specifies where the sequence begins
generates variety of different sized fragments
specifies where the sequence ends
both (a) and (b)

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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
structures at the ends of linear eukaryotic DNA molecules
the bonds between adjacent DNA nucleotides in the same strand

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