Asked by: Jianhao Aquilue
asked in category: General Last Updated: 26th March, 2020

Are oligos single stranded?

Researchers use short, single-stranded oligos (20-30 nucleotides) that are synthesized to have a nucleotide sequence complimentary to the outside edges of the DNA sequence that is the target for copying. While PCR uses short oligos, current DNA synthesis methods can make oligos of 200 or more bases long.

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Furthermore, are oligos double stranded?

Yes, IDT can synthesize duplex oligos. When entering your oligo, select the Duplex option on the order form. Selecting this option will load a revised order form with space for the sequence of a complementary strand.

Secondly, are primers oligos? Oligonucleotides are used as probes for detecting specific sequences that are complementary to the oligonucleotides. Oligonucleotides made up of 2'-deoxyribonucleotides are the molecules used in polymerase chain reaction (PCR). These are referred to as primers and are used to massively amplify a small amount of DNA.

Thereof, are primers single stranded?

Primers are short sequences of single stranded DNA that mark both ends of the target sequence. Two primers are utilized, one for each of the complementary single strands of DNA released during denaturation.

How do you anneal single stranded DNA?

This protocol is for annealing two single-stranded oligonucleotides with complementary sequences (Figure 1).


  1. Mix equal volumes of the equimolar oligonucleotides in a microtube.
  2. Incubate the microtube at 95 °C for 5 min.
  3. Allow the microtube to slowly cool to room temperature (should take <60 min).

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