比较DNA复制和RNA转录的异同。
为什么说存在投资陷阱时既使依然存在着“两分法”，凯恩斯效应仍然不起作用。
一段DNA的碱基序列如下，试问翻译这段DNA编码的mRNA，需要多少种tRNA？其可能的反密码子是什么？译得的多肽链，其氨基酸序列如何？(可以查密码表)
5′……AAGGAGGT……ATAATGTTTAGAGTAAGATCTCCT……TAG……3′
3′……TTCCTCCA……TATTACAAATCTCATTCTAGAGGA……ATC……5′
Directions: You aregoing to read a list of headings and a text about the functions of advertisment. Choosethe most suitable heading from the list A-F for eachnumbered paragraph (41-45). There isone extra heading which you do not need to use. Mark your answers on ANSWER SHEET 1.(10 points) [A]Advertisements add interests to life [B] Advertisementshelp to save money [C]Criticisms on advertisers [D]Usefulness of small advertisements [E]True aesthetic value of advertisement [F]Informing : the chief function of advertising
Advertisers tend to think big and perhapsthis is why they're always coming in for criticism. Their critics seem toresent them because they have a flair for self-promotion and because they haveso much money to throw around. "It's iniquitous," they say,"that this entirely unproductive industry (if we can call it that) shouldabsorb millions of pounds each year. It only goes to show how much profit thebig companies are making. Why don't they stop advertising and reduce the priceof their goods？ After all, it's the consumer who pay... "
The poor old consumer! He'd have to pay agreat deal more if advertising didn't create mass markets for products. It isprecisely because of the heavy advertising that consumer goods are so cheap.But we get the wrong idea if we think the only purpose of advertising is tosell goods. Another equally important function is to inform. A great deal ofthe knowledge we have about household goods derives largely from theadvertisements we read. Advertisementsintroduce us to new products or remind us of the existence of ones we alreadyknow about. Supposing you wanted to buy a washing machine, it is more thanlikely you would obtain details regarding performance, price, etc. , from anadvertisement.
Lots of people pretend that they neverread advertisements, but this claim may be seriously doubted. It is hardlypossible not to read advertisements these days. And what fun they often are,too! Just think what a railway station or a newspaper would be like without advertisements.Would you enjoy gazing at a blank wall or reading railway laws while waiting fora train？ Would you like to read only closely-printed columns of news in yourdaily paper？ A cheerful, witty advertisement makes such adifference to a drab wall or newspaper full of the daily ration of calamities.
根据以上内容，回答1~5题。 ______。
自从发现RNA拟酶(ribozyme)以来，许多人相信最初的遗传物质是RNA，而不是DNA。然而现代一切细胞都以DNA，而不是以RNA为遗传物质。你对此作何解释？
分析下述算法功能
Status A(BiThrTree T，Status(*Visit)(TglemType e)){
p—T一>lchild；
while(p!一T){
while(p一>LTag==Link)p=p->lChild；
if(!Visit(p-->data))return ERRoR；
while(p一>RTag一=Thread&&p->rchild!=T){
p=p->rchild；
Visit(p-->data)；
}
p=p->rchild；
}
return OK；
}