Chapter 7 Regulation of Gene Expression Regulation of Enzyme Activity Constitutive enzymes -Enzymes induced by specific circumstances Two major modes of regulation in the cell Control the activity of preexisting enzymes Control the amount of an enzyme

Eukarva: Eukaryotic Microorganisms Algae: Phototrophic eukaryotic microorganisms Fungi: Nonphotosynthetic eukaryotic microorganisms that contain rigid cell walls Slime molds: nonphototrophic eukaryotic microorganisms that lack cell walls and that aggregate to form fruiting structures (cellular slime molds) or masses of protoplasm (acellular slime

Wonder of the Genetic Engineering Expression of luciferase gene in a plant

Biodegradation of xenobiotics H DDT: dichlorodiphenyltrichloroethane (an organochlorine) -SCHCOOC H Xenobiotics are chemically CHO CH22COOC2H Malathion; mercaptosuccinic acid diethyl ester synthesized compounds that (an organophosphate) have never been existed

Chapter 17 Microbial Ecology 2 Methane and methanogenesis Rumen microbial ecology Biogeochemical cycles: nitrogen Biogeochemical cycles: sulfur Biogeochemical cycles: iron Microbial leaching Biogeochemical cycles: trace metals and mercury

清华大学：《分子生物学》课程PPT教学课件（基因ene）第二十九章 梯度、级联和发信号的途径（Gradients, cascades, and signaling pathways）

清华大学：《分子生物学》课程PPT教学课件（基因ene）第二十八章 致癌基因和癌症（Oncogenes and cancer）

清华大学：《分子生物学》课程PPT教学课件（基因ene）第二十七章 细胞循环和生长调控（Cell cycle and growth regulation）

清华大学：《分子生物学》课程PPT教学课件（基因ene）第二十六章 信号的传输（Signal transduction）

清华大学：《分子生物学》课程PPT教学课件（基因ene）第二十五章 蛋白质间的开放交通（Protein trafficking）