Nucleic Acid Structure
In DNA sequencing, the primer

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

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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
structures at the ends of linear eukaryotic DNA molecules
proteins that help partially denatured enzymes to recover their native configuration

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