[DOC] [TLE] The Structure of DNA [PAR] Note that the purine bases (adenine and guanine) have a double ring structure 
while the pyrimidine bases (thymine and cytosine) have only a single ring. ... IS 
ONLY ONE WAY THE BASES CAN PAIR UP ON THE RUNGS OF THE DNA 
LADDER. ... These form between parts of the molecules that have weak positive 
and... [DOC] [TLE] Why must a purine pair with a pyrimidine? | Reference.com [PAR] Purine and pyrimidine are organic, aromatic ring compounds that act as the ... In 
DNA base pairing, adenine pairs with thymine, and guanine pairs with cytosine. 
... Bonded together, these nitrogenous bases form the rungs of the DNA ladder,... [DOC] [TLE] What makes up the rungs of the DNA molecule? | Reference.com [PAR] When two strands of DNA form a double-strand helix, the bases pair up in ... The 
larger two bases are guanine and adenine, which are called purines. ... A: The 
rungs of the DNA ladder consist of four nitrogenous bases: adenine, thymine, 
cytosine ... The Backbone of DNA Consists of  Name 2 Bases with Double C-n 
Rings... [DOC] [TLE] Instructor's Copy [PAR] If DNA is ladderlike, which two molecules of a nucleotide form the sides, or 
upright portion ... If four guanine bases appear in a DNA model, how any cytosine 
bases should there be? ... To which base in DNA do the following RNA bases 
pair? [DOC] [TLE] The Structure of DNA [PAR] The DNA molecule actually consists of two such chains that spiral around an 
imaginary ... Alternating sugar and phosphate units form the two sides of a ladder
-shaped ... The nitrogen bases are ring compounds with their carbon and 
nitrogen ... always pairs with thymine (T), and guanine (G) always pairs with 
cytosine (C). [DOC] [TLE] DNA Is a Structure That Encodes Biological Information | Learn ... [PAR] Opposite the 5' carbon, on the other side of the deoxyribose ring, is the 3' carbon, 
... When nucleotides join together in a series, they form a structure known as a ... 
of two polynucleotides that are arranged such that the nitrogenous bases within 
... much like a ladder with sugar-phosphate side supports and base-pair rungs. [DOC] [TLE] What is the Structure of DNA? [PAR] Guanine. Adenine. Thymine. Cytosine. CHAPTER 1. DNA: The. Hereditary. 
Molecule ... with a single ring (such as C and T) are known as pyrimidines. 2. A 
stable DNA ..... parallel (opposite) directions in order for the bases to pair 
properly and form the hydrogen bonds that hold the ... The sides of the DNA 
ladder are made. [DOC] [TLE] Structural Biochemistry/Nucleic Acid/DNA/DNA structure - Wikibooks ... [PAR] Those two bases form a base-pair (H-bond interaction that keeps strands ... The 
basepairs in DNA are adenine-thymine (A-T) and cytosine-guanine (C-G). Such 
interactions provide us an understanding that nitrogen-containing bases are .... 
The furanose ring of each deoxyribose sugar is in the C-2' endo conformation. [DOC] [TLE] The Structures of DNA and RNA - Biology [PAR] orientation of the base pairs varies slightly from base pair to base pair in a 
manner ... These structures are full of surprises, such as non-classical .... atoms 
attached to the purine and pyrimidine rings are in the amino form ... of cytosine 
into the imino form (a) and guanine into the enol form (b). ...... Figure 6-24 shows 
a ladder. [DOC] [TLE] Nitrogenous base - Wikipedia [PAR] A nitrogenous base, or nitrogen-containing base, is an organic molecule with a 
nitrogen atom that has the chemical properties of a base. The main biological... [DOC] [TLE] Principles of Biochemistry/Nucleic acid I: DNA and its nucleotides ... [PAR] These four bases are attached to the sugar/phosphate to form the complete 
nucleotide ... of thymine in RNA and differs from thymine by lacking a methyl 
group on its ring. .... Alternate hydrogen bonding patterns, such as the wobble

Question: This type of "pair", such as guanine-cytosine, forms a rung on the DNA ladder
Answer: a base pair