下图表示某DNA片段遗传信息的传递过程，①～⑤表示物质或结构，a_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题读图填空题

下图表示某DNA片段遗传信息的传递过程，①～⑤表示物质或结构，a、b、c表示生理过程。请据图回答：(可能用到的密码子：AUG-甲硫氨酸、GCU-丙氨酸、AAG-赖氨酸、UUC-苯丙氨酸、UCU-丝氨酸、UAC-酪氨酸)

(1)完成遗传信息表达的是___________(填字母)过程，a过程所需的酶有_____________。

(2)图中含有核糖的是___________(填数字)；由②指导合成的多肽链中氨基酸序列是__________。

(3)该DNA片段第三次复制需游离的胸腺嘧啶脱氧核苷酸的数目为____________个。

(4)若在AUG后插入三个核苷酸，合成的多肽链中除在甲硫氨酸后多一个氨基酸外，其余氨基酸序列没有变化。由此证明_________________________。

(5)苯丙酮尿症是由于控制某种酶的基因异常而引起的，这说明基因和性状的关系是_____________。

答案

(l)b、c 解旋酶和DNA聚合酶

(2)②③⑤ 甲硫氨酸一丙氨酸—丝氨酸—苯丙氨酸

(3)28

(4)一个密码子由3个碱基(核糖核昔酸)组成

(5)基因通过控制酶的合成控制代谢过程，进而控制生物的性状

单项选择题 A1/A2型题

下述哪项一般不会引起全身淋巴结肿大（）

A.链霉素过敏

B.淋巴瘤

C.白血病

D.传染性单核细胞增多症

E.再生障碍性贫血

完形填空

The simplest way to say it is this: I believe in my mother. My 36 began when I was just a kid. I   37 becoming a doctor.
My mother was a domestic. Through her work, she observed that 38 people spent a lot more time reading than they 39   watching television. She announced that my brother and I 40 watch two to three pre-selected TV programs during the week. With our free time, we had to read two books each from the Detroit Public Library and 41 her written book reports. She would mark them up with check marks and highlights. Years later, we realized her marks were a 42 . My mother was Illiterate(不识字的，文盲的)。
When I entered high school I was a(n) 43 , but not for long. I wanted the fancy clothes. I wanted to 44 the guys. I went from being an A-student to a B-student to a C-student. One night my mother came home from 45 her various jobs and I complained about not having enough Italian knit shirts. She said, “Okay, I’ll give you all the money I make this week scrubbing floors and cleaning bathrooms, and you can buy 46 food and pay the bills. With everything 47 , you can have all the Italian knit shirts you want.” I was very 48  with that arrangement but once I got through distributing money, there was 49 left. I realized my mother was a financial genius to be able to 50 our heads and any kind of food on the table, 51  buy clothes. I also realized that immediate satisfaction wasn’t going to get me anywhere. Success required intellectual preparation. I went back to my 52 and became an A-student again, and eventually I 53 my dream and I became a doctor.
My story is really my mother’s story—a woman with  54 formal education or property who used her position as a parent to change the lives of many people around the globe. There is no job 55 than parenting.（养育） This I believe.

B．got used to

D．got tired of

D．should often

B．hang out with

C．break away from

D．keep up with

A．your brother

C．your sisiter

D．carried out

C．disappointed

小题15:A knock into

B.gave an impression on

C. keep a roof over

D. have eyes in the back of

D．leave alone

A．more interesting

B．less important

C．more important

D．less interesting