0  306887  306895  306901  306905  306911  306913  306917  306923  306925  306931  306937  306941  306943  306947  306953  306955  306961  306965  306967  306971  306973  306977  306979  306981  306982  306983  306985  306986  306987  306989  306991  306995  306997  307001  307003  307007  307013  307015  307021  307025  307027  307031  307037  307043  307045  307051  307055  307057  307063  307067  307073  307081  447090 

8.---The book is borrowed from the library. You ____ your children touch it with their dirty hands.  ---Sorry.          

    A.should have let                              B.needn’t have let 

    C.mustn’t have let               D.ought not to have let 9.---What would you like to see, my passport or my ID card? 

---Oh, ____. 

A.either one will do           B.each will be fine 

C.each one is good         D.either does well

试题详情

6.Nowhere else in the world ____ more attractive scenery than in my home country, China.

A.can you find  B.you can find C.you have found  D.has been found 7.____ is none of your business. 

A.What action I shall take                   B.What action shall I take 

C.It is what action I shall take                 D.I shall take what action

试题详情

5.---Why are the four students so happy? 

---_______ in the science competition, they are awarded prize money totaling $20,000.

A.Judged the best      B.Judging the best 

C.To be judged the best     D.Having judged the best

试题详情

4.---Why does the boss look worried? 

---Tom left the company a month ago and his work ________ unfinished ever since.

A.has been left B.was left    C.left       D.is leaving

试题详情

3.---We’ve seen many more days of blue skies recently.

  ---True. But back in 1998, ________ Beijing started its “Defending the Blue Sky”    program, the city only ________ about 100 days a year. 

    A.which, sees   B.that, saw      C.when, saw    D.and, seeing

试题详情

2.How about taking ______ short break? I want to make _______ call. 

    A.the, a     B.a, the     C.the, the     D.a, a

试题详情

1.---Where shall we go and enjoy ourselves in summer?  --- Of course, Qinhuangdao. ________ next to Bohai Sea ________ a coastline of 124 km, it is a   

perfect place to go in summer. 

    A.Laying, at    B.Lying, with     C.Laid, with    D.Being laid, for

试题详情

34.(12分)如图为基因表达的过程,据图回答:

  (1)能将遗传信息从细胞核传递至细胞质的是     (填数字),其基本组成单位是

     。进行a过程所需的酶有          

  (2)图中⑤所运载的氨基酸是    。(密码子:AUG-甲硫氨酸、GCU-丙氨酸、AAG-赖氨酸、UUC-苯丙氨酸)

  (3)图中信使RNA对应的DNA片段连续复制两次共需要游离的胸腺嘧啶脱氧核苷酸的数目为      个。

 

 

 

 

 

 

 

 

 

 

试题详情

33.(8分)回答下列有关遗传的问题(图中■患甲病男性,□正常男性,●患甲病女性,○正常女性)。

  (1)张某家族患有甲病,该家族遗传系谱图不慎被撕破,留下的残片如上图。

①现找到4张系谱图碎片,其中属于张某家族系谱图碎片的是(   )

②7号的基因型是     。(基因用A、a表示)

③若16号和正确碎片中的18号婚配,预计他们生一个患病男孩的概率是  

    (2)李某家族也患有甲病,其遗传系谱图如下。已知Ⅱ3无致病基因,Ⅲ1色觉正常;17号是红绿色盲基因携带者。若Ⅲ1与17号结婚,则他们的孩子中只患一种遗传病的概率是   

试题详情

32.(16分)下图分别表示某基因型为AaBbdd的雌性高等动物细胞分裂过程中某时期的染色体和基因示意图(·和表示着丝点,1表示的染色体是X染色体)及配子形成时细胞中染色体数量变化曲线图。请据图回答:

  (1)图A细胞名称为____________,该细胞中含同源染色体_________对,1表示X染色体,则2和3叫做____________。

  (2)写出该生物可以产生的配子的基因组成________ 、________、_______、________。

  (3)如果该生物进行测交,另一亲本体细胞中的染色体和有关基因的组成应是下图中的_______________。

试题详情


同步练习册答案