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. Hence, there are 64 codons for 20 amino acids since every codon for one amino acid means that there exist more than code for the same amino acid. 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. A = G and C = T only c. A + C = G + T only d. A + T = G + C e. all of the above are possible 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 64 codons involve sense codons (that specify amino acids). 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 term nucleotide refers to the base, sugar, and phosphate group. The Nucleotide database is a collection of sequences from several sources, including GenBank, RefSeq, TPA and PDB. In contrast, there are 64 possible nucleotide triplets (4 3), which is far more than the number of amino acids. One of these elements is simple, five-carbohydrate sugars. The four bases of nucleotide i.e, (A, G, C, and U) are used to produce three-base codons. In other words, a given amino acid could be encoded by more than one nucleotide triplet. A + C is the same as A + T b. a. Susan S. Baker, Robert D. Baker, in Immunophysiology of the Gut, 1993. Dietary nucleic acids are absorbed as nucleotides, nucleosides, and free bases. Nucleotide diversity can be calculated by examining the DNA sequences directly or may be estimated from molecular marker data. A nucleotide can contain one of two sugars: Deoxyribose, a monomer of DNA, OR The nucleotides are of great importance to living organisms, as they are the building blocks of nucleic acids, the substances Single nucleotide polymorphisms, frequently called SNPs (pronounced “snips”), are the most common type of genetic variation. Pere Puigserver, in Hematology (Seventh Edition), 2018. Each SNP represents a difference in a single DNA building block, called a “nucleotide.” For example, an SNP may replace the nucleotide cytosine (C) with the nucleotide thymine (T) in a certain stretch of DNA. 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. 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