首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists
About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists
admin
2013-11-07
41
问题
About fifty years ago, plant physiologists set out to grow roots by
themselves
in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and the usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require energy, of course. The process of respiration uses sugar to make the high energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen.
The study of isolated roots has provided an understanding of the relationship between shoots and roots in
intact
plants. The leaves of the shoots provide the roots with sugar and vitamins, and the roots provide the shoots with water and minerals. In addition, roots can provide the shoots with organic nitrogen compounds. This
conies in handy
for the growth of buds in the early spring when leaves are not yet functioning. Once leaves begin photosynthesizing, they produce protein, but only mature leaves can "export" protein to the rest of the plant in the form of amino acids.
The underlined word "themselves" in Paragraph 1 refers to______.
选项
A、plant physiologists
B、solutions
C、laboratory flasks
D、roots
答案
A
解析
细节题型。见第一段第一句:About fifty years ago,plant physiologists set out to growroots by t—hems—elves in solutions in laboratory flasks.这里指plant physiologists自己培育根用作物;因此themselves在此应为正确选项。
转载请注明原文地址:https://kaotiyun.com/show/YIwO777K
本试题收录于:
CATTI三级笔译综合能力题库翻译专业资格(CATTI)分类
0
CATTI三级笔译综合能力
翻译专业资格(CATTI)
相关试题推荐
NarratorListentoaconversationbetweentwostudentsafterascienceclass.Nowgetreadytoanswerthequestions.Y
LIFESUCCESSANDSATISFACTION1Lifesatisfaction,whichcanbedefinedasgeneralhappinessorwellbeing,isrelatedtoseve
NarratorListentoaconversationbetweentwostudents.Nowgetreadytoanswerthequestions.Youmayuseyournotesto
CancerandChemicalsLastyear,CaliforniagovernorGeorgeDeukmejiancalledtogethermanyofthestate’sbestscientificmi
GadgetswithaSportingChanceConsumerelectronics:Newsportsequipment,fromtennisracketstorunningshoes,usesproces
AirPollutionandAcidRainTheincreasingvarietyandprevalenceofpollutionpresentstheworldwithmanyextremelydaunti
Theuniversitylibraryhasrecentlyadjustedtheiroperatinghours.Readthelibrary’sannouncementabouttheadjustment.Youwi
WhyarestandardmedicalMRIslessusefulinneurosciencethanFMRIs?
ResearchpublishedinMay1993bytheDepartmentoftheEnvironment,TransportandtheRegions(DETR)showedthatreducingcoast
Asstrangeitmaysound,Iwaspleasedthattheprogramwasover.
随机试题
患者男,35岁,体重70kg,因左耳缓慢进行性听力下降就诊于耳科门诊。诉耳鸣,走路不稳感,既往儿时有左耳流脓史1年。下列检查中合适的是
患者张某,男性,18岁,面部危险三角区感染化脓,护士告知患者此部位忌用热敷,其主要原因是
下列哪种情况容易产生三凹征
不属于应收账款对于企业的影响的是( )。
根据产品质量法的规定,《产品质量法》所指缺陷,是指()。
某试验的结果如表1.1—1所示,假定事件互不相容。若记事件A=(b,c,d,e),B=(a,d,e),则P(A—B)为()。
上海贝尔公司始终把员工看成公司的宝贵资产,并为拥有一支高素质的员工队伍而自豪。公司每年召开的董事会,都有相当多的时间用于专题讨论员工培训计划、奖金分配方案、工资调整和其他福利政策等问题。上海贝尔公司把以人为本的经营方略体现在了公司的福利政策上。(
2005年全国房地产开发完成投资()2006年12月新建商品住房销售价格与上月比涨幅在福州前面的主要城市是()
中国古代法律中有关于“公罪”的规定,“公罪”指的是官员在执行职务的过程中由于疏忽大意、过于自信等主观过失以及才力不及造成负面后果的犯罪行为。根据上述定义,下列属于古代法律中“公罪”的情形是()。
楚有祠者,赐其舍人卮酒。舍人相谓曰:“数人饮之不足,一人饮之有余。请画地为蛇,先成者饮酒。”一人蛇先成,引酒且饮之,乃左手持卮,右手画蛇曰:“吾能为之足。”未成,一人之蛇成,夺其卮曰:“蛇固无足,子安能为之足?”遂饮其酒。为蛇足者,终亡其酒。
最新回复
(
0
)