51.1核酸的种类、分布与功能 51概述 DNA分子的片段 Nucleic Acid (na) Polynucleotide chain (poly nt) Nucleotide nt basic unit Mono-phosphate(Mp) Nucleoside(ns) Deoxy-ribose( ribose ) Base Purin(pu) Pyrimidine(py Adenine(a) Thymine (t) Guanine(g) Uracil(U) Cytosine(C)Nucleic Acid (NA) Polynucleotide chain (poly Nt) Nucleotide (Nt) basic unit Mono-phosphate (Mp) Nucleoside (Ns) Deoxy-ribose ( Ribose ) Base Purin (pu) Pyrimidine (py) Adenine (A) Thymine (T) Guanine (G) Uracil (U) Cytosine (C) DNA分子的片段 •5.1.1 核酸的种类、分布与功能 5.1 概 述