问题 读图填空题

下图表示某高等植物细胞中基因表达的过程,“→”表示物质转移的路径和方向,请仔细观察和分析图解,并回答下列问题:

(1)图中rbcs基因表达的产物是SSU,Cab基因表达的产物是LHCP。在基因表达的过程中,图中的Ⅱ、Ⅲ、Ⅳ代表的物质或结构依次为____________。

(2)图中V是叶绿体中的小型环状DNA,V上的基因表达的产物是LUS,物质Ⅵ具有催化某种高分子物质合成的作用,则Ⅵ是____________。

(3)据图可知,基因表达过程中转录发生的细胞部位是________,翻译发生的细胞部位是_______。

(4)据图可知,合成的LHCP参与光合作用的______反应。由SSU和LUS组装成的Rubisco催化CO2+C5→2C3反应的过程,则Rubisco存在于_________中。

(5)为了防止转基因作物的目的基因通过花粉转移到自然界中的其他植物中,科学家设法将目的基因整合到受体细胞的叶绿体基因组中,其原因是_______________。

答案

(1)mRNA、核糖体、肽链

(2)RNA聚合酶

(3)细胞核(染色体)和叶绿体基质       细胞质基质和叶绿体基质

(4)光       叶绿体基质

(5)转基因植物与其他植物间不能通过花粉发生基因交流(或叶绿体中的目的基因不会通过花粉传递给下一代)

完形填空
完形填空 (共 20 小题; 每小题 1.5 分, 满分 30 分)
阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
“A robbery ...” a voice came from the radio.John was driving home late last night from a trip, and now he was having trouble staying   36   .He turned   37  the radio and tried to fix his attention on the   38  , but his eyes kept on closing.
  It was   39  that he noticed the hitchhiker (搭便车者) by the road.  40  even thinking about what he was doing, he stopped the car.
  “To Midrille?” “Get in.” The hitchhiker got in and immediately John was   41   that he had picked him up.The young man    42   a strange face and long hair.When John asked him questions about himself, he changed the   43  
  John   44  the news.He began to sweat  and his thoughts   45  nervously to all the money he was   46  
  At the next small town he stopped his car and said, “I’m sorry.I’m so   47   that I can’t drive you to Midrille.I think I’ll find a   48  and spend the night.”
  The young man slowly   49  into his pocket.“This is it!” thought John.At that   50 moment he considered shouting for help, but instead of a gun, the hitchhiker pulled out several    51   .“Oh, no.I don't want your money.Just get out.Okay?”
  The young man looked    52  .He insisted on   53  John the money.John watched until his   54  had disappeared from sight, then stepped on the    55  and drove out of town.
小题1:
A.asleepB.earlyC.strongD.awake
小题2:
A.on B.offC.up D.over
小题3:
A.outside B.news C.speed D.way
小题4:
A.there B.earlier C.then D.moment
小题5:
A.Without B.After C.By D.For
小题6:
A.happy B.sad C.angry D.sorry
小题7:
A.wore B.owned C.had D.made
小题8:
A.place B.subject C.question D.face
小题9:
A.rememberedB.thought C.heard D.forgot
小题10:
A.got B.arrived C.changed D.turned
小题11:
A.paying B.having C.carrying D.borrowing
小题12:
A.afraid B.hungry C.cold D.sleepy
小题13:
A.restaurantB.shop C.hotel D.station
小题14:
A.reached B.forced C.got D.put
小题15:
A.important B.very C.long D.short
小题16:
A.knives B.photos C.handkerchiefs D.bills
小题17:
A.frightenedB.puzzled C.worried D.curious
小题18:
A.giving B.offering C.handing D.returning
小题19:
A.driver B.friend C.passenger D.thief
小题20:
A.door B.gas C.window D.motor
单项选择题