题目:某条多肽的相结分子质量为2778,若氨基酸的平均相对分子质量为110,如考虑终止密码子,则编码该多肽的基因长度至少是
A. 75对碱基 B. 78对碱基
C. 90对碱基 D. 93对碱基
喵查答案:D
根据题中条件可知该多肽由30个氨基酸组成,则应为30个密码子再加上终止密码子应为31,编码多肽的基因碱基为31×6=186,93对碱基。
……继续阅读 »
题目:某条多肽的相结分子质量为2778,若氨基酸的平均相对分子质量为110,如考虑终止密码子,则编码该多肽的基因长度至少是
A. 75对碱基 B. 78对碱基
C. 90对碱基 D. 93对碱基
喵查答案:D
根据题中条件可知该多肽由30个氨基酸组成,则应为30个密码子再加上终止密码子应为31,编码多肽的基因碱基为31×6=186,93对碱基。
……继续阅读 »
题目:I had great difficulty________the suitable food on the menu in that restaurant.
A. find
B. found
C. to find
D. finding
喵查答案:D
have difficulty(in)doing sth.做某事有困难。
……继续阅读 »
题目:with them. The first man got over his shock and politely said to 67.
喵查答案:
With them. The first man got over his shock and politely said to 67.√
……继续阅读 »
题目:What do we know about the rich men in the 17th century
A.They tended to wear clothes without bottons.
B.They were interested in historical matters.
C.They were mostly dressed by……继续阅读 »