23.1 Introduction 23.2 Group I introns undertake self-splicing by transesterification 23.3 Group I introns form a characteristic secondary structure 23.4 Ribozymes have various catalytic activities 23.5 Some introns code for proteins that sponsor mobility 23.6 The catalytic activity of RNAase P is due to RNA 23.7 Viroids have catalytic activity 23.8 RNA editing occurs at individual bases
22.1 Introduction 22.2 Nuclear splice junctions are short sequences 22.3 Splice junctions are read in pairs 22.4 Nuclear splicing proceeds through a lariat 22.5 snRNAs are required for splicing 22.6 U1 snRNP initiates splicing 22.7 The E complex can be formed in alternative ways 22.8 5 snRNPs form the spliceosome
21.1 Introduction 21.2 Response elements identify genes under common regulation 21.3 There are many types of DNA-binding domains 21.4 A zinc finger motif is a DNA-binding domain 21.5 Steroid receptors are transcription factors 21.6 Steroid receptors have zinc fingers 21.7 Binding to the response element is activated by ligand-binding 21.8 Steroid receptors recognize response elements by a combinatorial code
第一节 蛋白质的营养作用 Nutritional Function of Protein 第二节 蛋白质的消化、吸收和腐败 Digestion, Absorption and Putrefaction of Proteins 第三节 氨基酸的一般代谢 General Metabolism of Amino Acids 第四节 氨的代谢 Metabolism of Ammonia 第五节 个别氨基酸的代谢 Metabolism of Individual Amino Acids
第一节 蛋白质的营养作用 Nutritional Function of Protein 第二节 蛋白质的消化、吸收和腐败 Digestion, Absorption and Putrefaction of Proteins 第三节 氨基酸的一般代谢 General Metabolism of Amino Acids 第四节 氨的代谢 Metabolism of Ammonia 第五节 个别氨基酸的代谢 Metabolism of Individual Amino Acids