The four bases of nucleotide i.e, (A, G, C, and U) are used to produce three-base codons. A + C is the same as A + T b. Nucleotide, any member of a class of organic compounds in which the molecular structure comprises a nitrogen-containing unit (base) linked to a sugar and a phosphate group. One of these elements is simple, five-carbohydrate sugars. Each nucleotide is a molecule, so while the bases are extremely important for how the nucleotide is classified and for its eventual function, they cannot form without the other elements that make up the molecule. The 64 codons involve sense codons (that specify amino acids). In other words, a given amino acid could be encoded by more than one nucleotide triplet. where xi and xj are the respective frequencies of the ith and jth sequences, ij is the number of nucleotide differences per nucleotide site between the ith and jth sequences. The Nucleotide database is a collection of sequences from several sources, including GenBank, RefSeq, TPA and PDB. Nucleotide diversity can be calculated by examining the DNA sequences directly or may be estimated from molecular marker data. The structure of adenosine triphosphate is shown in Figure 1.5, in which the phosphate group is attached to the 5′ carbon of the ribose. A nucleotide can contain one of two sugars: Deoxyribose, a monomer of DNA, OR Scientists theorized that amino acids were encoded by nucleotide triplets and that the genetic code was degenerate. Susan S. Baker, Robert D. Baker, in Immunophysiology of the Gut, 1993. In an analysis of the nucleotide composition of a double stranded DNA to see which bases are equivalent in concentration, which of the following would be true? The term nucleotide refers to the base, sugar, and phosphate group. DNA sequencing: a technique used in molecular biology that determines the sequence of nucleotides (A, C, G, and T) in a particular region of DNA; dideoxynucleotide: any nucleotide formed from a deoxynucleotide by loss of an a second hydroxyl group from the deoxyribose group Dietary nucleic acids are absorbed as nucleotides, nucleosides, and free bases. Nucleotides are important participants in energy-transfer reactions, are precursors for nucleic acid synthesis, and function as coenzymes. Here is a general formula. 2 Nucleotides. In contrast, there are 64 possible nucleotide triplets (4 3), which is far more than the number of amino acids. A = G and C = T only c. A + C = G + T only d. A + T = G + C e. all of the above are possible Single nucleotide polymorphisms, frequently called SNPs (pronounced “snips”), are the most common type of genetic variation. 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