请学life science 的桐子进来帮我解答一些问题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?
[我行故我 (9-25 0:15, Long long ago)]
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1, b; 2, b; 3, dintrons are the regions which is splited out from the gene and not expressed in eukaryotic system,
extrons are the regions EXpressed into protein.
the negative charge is not carred by the base but the phosphate group.
Ribosomal RNA are the enzymatic RNA exist in ribosome,
there are 3 in prokaryotic system,
together with other proteins, involved in initiation and elongation, as attracting factors for tRNA binding inside the ribose, as weell as the key factors controlling the expression dosage, especially 16s in Ecoli, some expression ehancers are known to be 16s complementary element, the last point, is, by modern molecular microbiology, the reason why bacteria are classified by 16s rRNA sequencing....[有话想说 (9-26 19:56, Long long ago)]
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(引用 有话想说:1, b; 2, b; 3, dintrons are the regions which is splited out from the gene and not expressed in eukaryotic system, extrons are t...)ft, 3 rRNA in prokaryotic system, 16s, 23s, and 5s4 in eukaryotic system, 18s, 28s, 5s and 5.8s...[有话想说 (9-26 19:58, Long long ago)] [ 传统版 | sForum ][登录后回复]3楼
(引用 有话想说:1, b; 2, b; 3, dintrons are the regions which is splited out from the gene and not expressed in eukaryotic system, extrons are t...)ft, 人老了，也糊涂了。。。。splited错了，应该是spliced......[有话想说 (9-26 20:02, Long long ago)] [ 传统版 | sForum ][登录后回复]4楼
(引用 有话想说:ft, 人老了，也糊涂了。。。。splited错了，应该是spliced......)另外，2a值得考虑一下.....^o)[有话想说 (9-26 20:14, Long long ago)] [ 传统版 | sForum ][登录后回复]5楼
(引用 有话想说:1, b; 2, b; 3, dintrons are the regions which is splited out from the gene and not expressed in eukaryotic system, extrons are t...)xie xie ha:P[我行故我 (9-26 22:51, Long long ago)] [ 传统版 | sForum ][登录后回复]6楼
(引用 有话想说:1, b; 2, b; 3, dintrons are the regions which is splited out from the gene and not expressed in eukaryotic system, extrons are t...)bdd, 2a is correct.[fool (9-27 14:05, Long long ago)] [ 传统版 | sForum ][登录后回复]7楼
(引用 fool:bdd, 2a is correct.)that is why i mentioned 2a saperately below.....DNA are not alwas in pair, as well, there are secondary DNA structures exist in the genome, where are not parallal......
similiar as human beings, not always in couples.......
danlian de DNA..... :$
[有话想说 (9-27 19:16, Long long ago)]
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(引用 有话想说:that is why i mentioned 2a saperately below.....DNA are not alwas in pair, as well, there are secondary DNA structures exist in ...)yes, I know, but consider they are lvl 1 course student,do you think they will touch that deep?[佘山老道 (9-30 11:12, Long long ago)] [ 传统版 | sForum ][登录后回复]9楼
(引用 佘山老道:yes, I know, but consider they are lvl 1 course student,do you think they will touch that deep?)你暴露了..... :P[有话想说 (10-2 17:25, Long long ago)] [ 传统版 | sForum ][登录后回复]10楼