3 Main differences between DNA & RNA: RNA uses the sugar Ribose while DNA uses Deoxyribose. RNA is single stranded while DNA is double stranded. RNA uses the nitrogenous base Uracil whereas DNA uses the nitrogenous base Thymine.
Double-stranded DNA consists of two polynucleotide chains whose nitrogenous bases are connected by hydrogen bonds. Within this arrangement, each strand mirrors the other as a result of the anti-parallel orientation of the sugar-phosphate backbones, as well as the complementary nature of the A-T and C-G base pairing.
The structure of DNA is similar to a ladder. It has a chemical phosphate and sugar backbone, which make up the sides of the ladder. (Deoxyribose is the sugar found in the backbone of DNA.) The two sides of this sugar-phosphate backbone are four nitrogenous bases: adenine (A), thymine (T), cytosine (C), and guanine (G). (A grouping like this of a phosphate, a sugar, and a base makes up a subunit of DNA which is known as a nucleotide.
Avro Vulcan B.2, XM751, of the Scampton Wing as seen from the tail at its base of RAF Scampton. Underneath the aircraft, on a trolley, can be seen four bottles of pressurised nitrogen used within the aircraft's Electronic Counter Measures suite. The bottles would be loaded through the open tail hatches seen. The Scampton Wing consisted of Nos 27, 83 and 617 Squadrons.
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This Modern Genetics PowerPoint Presentation has 20 slides on the following topics: Chemical Basis for Genetics, Nucleotides, Nitrogenous Bases of DNA, DNA Structure, DNA Replication, RNA - Ribonucleic Acid, Mutations, Human Genetic Diseases, Genetic Engineering, How to Clone a Sheep. $3.50
A diagram shows the three separate components of a nucleotide and how they are combined to form a complete molecule. A nitrogenous base is represented as a purple hexagon. A sugar is represented as a grey pentagon. A phosphate group is represented as a light brown circle. A cut-away from the generic nitrogen base shows the chemical structure of the three types of pyrimidine bases (cytosine, thymine, and uracil) and the two types of purine bases (adenine and guanine).