DNA STRUCTURE Structure: two polynucleotide chains are twisting around each other in the form of a double helix
DNA STRUCTURE Structure: two polynucleotide chains are twisting around each other in the form of a double helix
Schematic model Space-filling model hydrogen bond waongoe base 12A sugar.phasphate minor(1.2 nm) nadone groove "E2 22A major(2.2) groove A 3 5 H o Cn phosphate C andN P 20 A(2 nm) cster chain in bases
Schematic model Space-filling model
DNA is composed of polynucleotide chains Nucleoside nucleotide the fundamental building block of dna
DNA STRUCTURE ( ) 1 DNA is composed of polynucleotide chains Nucleoside & Nucleotide, the fundamental building block of DNA
Nucleoside 2-deoxyribose A 5 O—P—OH"HOCH OH base phosphoric acid 钻〓〓〓〓〓〓〓〓百〓〓〓〓〓〓〓〓〓〓〓〓〓〓百〓〓〓〓〓〓〓〓〓孟〓〓〓百〓百〓百孟百百百a孟 HO phosphoester bond N H HO glycosidic bond nucleotide(dAMP Copyright o 2004 Pearson Education, Inc, publishing as Benjamin Cummings
glycosidic bond phosphoester bond Nucleoside
TaBlE 6-1 Adenine and Related Compounds Base Nucleoside Nucleotide Adenine 2 -deoxyadenosine 2 -deoxyadenosine 5-phosphate Structure NH2 Asymmetric N N 530-P-cH HOCH,O 、 Adenine H OH H OH H 33 Molecular 135.1 251.2 331.2 weight Copyright o 2004 Pearson Education, Inc, publishing as Benjamin Cummings
3’ 5’ Asymmetric