一名20岁病人患有小血球性贫血，检测发现其体内血红蛋白的Β-多肽链共含有172个氨基酸残基，而不是正常的141个氨基酸残基，其可能是下列哪种基因突变造成的：
A. CGA--UGA
B. GAU--GAC
C. GCA--GAA
D. UAA--CAA
E. UAA--UAG
查看答案
原核生物和真核生物的蛋白质合成过程虽有很多不同之处，但在基本机制等方面又有诸多共同之处。下面哪一项对于原核生物和真核生物的蛋白质合成都是必需的：
A. 核糖体小亚基与S-D序列结合
B. fMet-tRNA
C. mRNA从细胞核转运至细胞质
D. 起始因子识别5末端帽子结构
E. 肽酰基-tRNA从A位转位至P位
行内式是通过标签的style属性来设置标签的样式的 。
A. 对
B. 错
关于内嵌式的描述,下列说法正确的是()。
A. 可以将结构与样式进行半分离
B. 仅设计一个页面时,可以使用内嵌式
C. 可以将结构和样式完全分离
D. 行内式不能将结构与样式分离
关于行内式的书写位置的描述,下列说法正确的是()。
A. 行内式写在根标签中
B. 行内式写在
头部标签中
C. 行内式写在
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