第一节 核酸的化学组成及其一级结构 The Chemical Component and Primary Structure of Nucleic Acid 第二节 DNA的空间结构与功能 Structure and Function of DNA 第三节 RNA的空间结构与功能 Structure and Function of RNA 第四节 核酸的理化性质 The Physical and Chemical Characters of Nucleic Acid

vantages. In fact the bus system does not provide frequent stops and the low Many people appreciate the conve- he bus stops is sometimes not so conve niences of private cars. A private car gives nient. And a private car also has many more comfort and mobility and enables a problems, such as too much harmful car person to go when and where he wants

and making as much effort as it can to restore and create more suitable re- serves for the survival and development of wildlife. In short, if the government and the whole society really realize the prob- lem, pay attention to it, and work togeth PNP

the country, educational facilities, medi owadays there is often a lack of ur d services and transportation systems are derstanding between parent and child still not fully developed. And the city also complain about their childrens \unreasonable\behavior, whil air pollution, great noise and poor housing children usually think their parents too

The Market Forces of Supply and Demand Supply and Demand are the two wordsthat economists use most often. Supply and Demand are the forces thatmake market economies work. Modern microeconomics is about supply,demand and equilibrium

A. Based on the information in the story, we can safely come to a lesson that everybody needs a happy life, and this happiness can play an important role in keeping our life active and meaningful. As a matter of fact, it should become our goal of life to be happy. Without happiness, many people will feel that life is empty and worthless.  B. If we read this story carefully, it is not hard for us to arrive at a lesson that everybody needs a happy life, and this happiness can play an important role in keeping our life active and meaningful. …

Exercises Linear equations for the consumption and saving schedule take the general form C=a + bY and S=-a+(1-b)Y, where C, S and Y are consumption, saving and national income respectively. (1) Use the given data to develop specific numerical values for the consumption and saving equations. Write the using these values

1.1 The Structure of Functional Groups 1.2 Reagents and Reactions 1.3 Learning Organic Functional Group Chemistry 2.1 Alkanes 2.2 Alkyl Halides 2.3 Alcohols 2.4 Epoxides and Ethers 2.5 Organosulfur Compounds 2.6 Aliphatic Amines 3.1 Alkenes 3.2 Alkynes 3.3 Carbonyl Compounds 3.4 Carboxylic Acids and their Relatives 3.5 Enolate and Related Carbanion Chemistry 3.6 Nitriles, Imines and Nitro Compounds 4.1 Aromatic Substitution 4.2 Aromatic Functional Groups 4.3 Heteroaromatic Compounds

When going down the Tigris and Euphrates rivers many years ago with a party of English travelers I found myself under the direction of an old Arab guide whom we hired up at Baghdad, and I have often thought how that guide resembled our barbers in certain mental characteristics. He thought that it was not only his duty to guide us down those rivers, and do what he was paid for doing, but to entertain us with stories curious and weird, ancient and

Good evening, my fellow Americans. First, I should like to express my gratitude to the radio and television networks for the opportunities they have given me over the years to bring reports and messages to our nation. My special thanks go to them for the opportunity of addressing you this evening. Three days f rom now, af ter a half century in the service of our country, I shall lay down the responsibilities of of fice as, in traditional and solemn ceremony, the authority of the Presidency is vested in my successor. This evening I come to you with a message of leave-taking and farewell, and to