Bacteria phylogeny by Nader Hassanzadeh

By Nader Hassanzadeh

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Since the 1970s, "phylogenetic systematics" has been gradually replacing "traditional systematics“. The student must understand both systems. 61 Phylogenetic Identification Advantages     Simple PCR based system. Can use pre-existing database as a reference frame. Discrimination of species and sub-species lineages according to length/number of loci. Stable reference base with little variation, useful for standardization and inter-laboratory comparison. Neil Parkinson 62 Molecular systematics Advantages      Molecular systematics is an essentially cladistic approach.

G. ). The biosynthesis of histidine is uses ATP and PRPP. The biosynthesis of deoxynucleotides is from ribonucleotide diphosphates. The biosynthesis of dTMP is from dUMP (Thymidylate synthase (TS) is the enzyme that catalyzes the transformation of deoxyuridine monophosphate (dUMP) into deoxythymidine monophosphate (dTMP) in cells). e. TMV. Plant viroid RNAs (≈ 400 nt, catalytic RNA, Code no protein). 43 RNA & cell formation        RNA is a sister molecule to DNA, used when DNA breaks up to create proteins or replicate.

Since the RNA in the RNA world is alive, it is assumed that RNA evolved into DNA through some sort of genetic takeover event.  In other words, RNA enzymes made DNA, which replaced it in the genome.  Proteins were added into the mix at some point. 1. Which came first? e. Watson/Crick). RNA has catalytic properties (the ribozymes of Cech and many others). e. ). g. ). The biosynthesis of histidine is uses ATP and PRPP. The biosynthesis of deoxynucleotides is from ribonucleotide diphosphates. The biosynthesis of dTMP is from dUMP (Thymidylate synthase (TS) is the enzyme that catalyzes the transformation of deoxyuridine monophosphate (dUMP) into deoxythymidine monophosphate (dTMP) in cells).

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