â Noodle originated in China and the name is derived from a German nudel which means pasta, and spaghetti originated in Italy. â Noodle is thin and elongated in shape. Spaghetti is long, cylindrical in shape and differs in thickness. â Noodle is made of unleavened dough cooked in boiling water and oil.
1 The helix in the double helix means that the entire thing is wound up in a spiral. 2  DNA composition: purine and pyrimidine bases, sugars, phosphate. 3  Nucleotide = base (Adenine, Guanine, Thymine, Cytosine) + sugar + phosphate. 4  Nucleoside = base + sugar = Adenosine, Guanosine, Thymidine, Cytidine.
DNA is coiled in the form of a double helix. Let us define an axis about which both strands of the DNA coil. A bending or twisting of that axis upon itself (Fig. 23-10) is referred to as DNA supercoiling. As detailed below, DNA supercoiling is generally a manifestation of structural strain.