Nucleic Acid Structure
In DNA sequencing, the primer

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

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Nucleic Acid Structure
Stem and loop structures are

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
structures at the ends of linear eukaryotic DNA molecules

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