摘要:
Figure 1. DNA (Deoxyribonucleic Acid) is the molecule which contains the genetic instructions. It consists of four different nucleotides, namely A... 阅读全文
posted @ 2014-10-17 21:45
Popco
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摘要:
A children's puzzle that was popular 30 years ago consisted of a 5x5 frame which contained 24 small squares of equal size. A unique letter of the ... 阅读全文
posted @ 2014-10-17 21:33
Popco
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