Nucleic Acid Structure
In DNA sequencing, the primer

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

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Nucleic Acid Structure
Stem and loop structures are

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

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