【正文】
1979年美國 A 反向的兩條多核苷酸鏈,右手螺旋。 ( 2)堿基的傾角大一些 ADNA: RNA分子中的雙螺旋區(qū); DNARNA雜交分子。s Scientists39。Millennium Collection39。每轉(zhuǎn)一周有 10個堿基對; 兩鏈的堿基均在主鏈的內(nèi)側(cè),一鏈的 A與另一鏈的 T配對,G與 C配對,前者配對形成二個氫鍵,后者配對形成三個氫鍵; DNA 雙螺旋二級結(jié)構(gòu)的穩(wěn)定因素: 氫鍵 堿基堆積力 離子鍵 Diagram of semiconservative replication. Parental DNA is shown in blue and newly synthesized DNA in red. [After M. Meselson and F. W. Stahl. Proc. Natl. Acad. Sci. . 44(1958):671.] Citations per year of Watson and Crick39。螺旋直徑 2nm; 成對的堿基大致處于同一個平面,該平面與螺旋軸基本垂直。 ② A=T; G=C; A+G=T+C WatsonCrick model of doublehelical DNA. One polynucleotide chain is shown in blue and the other in red. The purine and pyrimidine bases are shown in lighter colors than the sugarphosphate backbone. (A) Axial view. The structure repe