请学life science 的桐子进来帮我解答一些问题
所在版块：求学狮城 发贴时间：2004-09-25 00:15

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1. Which of the following statement(s) is/are correct for the human genome?
a) Most of the DNA codes for proteins
b) Most genes contain introns
c) Extons define where and when genes are to be activated
d) a and b
e) b and c

ps: what does introns and extrons mean?

2. Which of the following descriptins for the DNA structure is correct?
a) It is double-standed with anti-parallel helix
b) It is a polymer of nucleotides linked from one nucleotide to the next by
phosphodiester linkage
c) The polymer carries a net positive charges in its bases
d) a and b
e) b and c

ps: what does c) mean? can some body translate it into Chinese or explain it more detailedly for me?

3. Which of the following types of RNA is Not involed in the process of translation?
a) Ribosonal RNA
b) Transfer RNA
c) Messenger RNA
d) Small nuclear RNA
e) All of above are involved

ps: is Ribosonal RNA involved? if so, what is its functionality during the process?

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请学life science 的桐子进来帮我解答一些问题 － 我行故我 　2004-09-25 00:15 (946 bytes , 692reads )
1, b; 2, b; 3, d － 有话想说 　2004-09-26 19:56 (715 bytes , 445reads )
bdd, 2a is correct. － fool 　2004-09-27 14:05 (0 bytes , 241reads )
that is why i mentioned 2a saperately below..... － 有话想说 　2004-09-27 19:16 (202 bytes , 384reads )
yes, I know, but consider they are lvl 1 course student, － 佘山老道 　2004-09-30 11:12 (39 bytes , 359reads )
你暴露了..... :P － 有话想说 　2004-10-02 17:25 (0 bytes , 211reads )
xie xie ha:P － 我行故我 　2004-09-26 22:51 (0 bytes , 236reads )
ft, 人老了，也糊涂了。。。。splited错了，应该是spliced...... － 有话想说 　2004-09-26 20:02 (0 bytes , 249reads )
另外，2a值得考虑一下.....^o) － 有话想说 　2004-09-26 20:14 (0 bytes , 214reads )
ft, 3 rRNA in prokaryotic system, 16s, 23s, and 5s － 有话想说 　2004-09-26 19:58 (48 bytes , 257reads )