The written guide the researcher uses in writing the research paper is the
teacher's instructions
encyclopedia article
outline

The written guide the researcher uses in writing his research paper is the outline. The outline is supposed to serve the researcher as exactly what the name implies - an outline.

After this is written, the researcher has to provide a detailed and completed version of his paper to an editor in order to get it published. 

Okay, biology isn't exactly my strongest subject (it never has been), but i'm pretty sure the answer is nucleotides. dna is made up of nucleotides. each nucleotide contains a phosphate group, a sugar group, and a nitrogen base. there are four different nitrogen bases: adenine (a), thymine (t), guanine (g), and cytosine (c). a always pairs with t, and g always pairs with c.