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
2015-10-13
138
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 scientists found what the isolated roots need is______.
选项
A、quite natural
B、sugar, minerals and vitamins
C、some rare vitamins
D、organic nitrogen compounds
答案
B
解析
细节题型。见第一段第三句:They required—sugar and the usual minerals and vitamins.所以选项B是答案。
转载请注明原文地址:https://kaotiyun.com/show/6RwO777K
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
NarratorListentopartofalectureinabusinessclass.Nowgetreadytoanswerthequestions.Youmayuseyournotes
TheUniversityisplanningtocarryoutanewhousingfeesystem.Readthenoticeaboutit.Youwillhave45secondstoreadthe
Accordingtothepassage,theinventorsofwrittenlanguageinMesopotamiawereprobablytheAccordingtothepassage,bythe
FamilyMattersThismonth,Wyomingpassedabillthatwouldgivelegalteethtothemoralobligationtosupportone’sparent
AirPollutionandAcidRainTheincreasingvarietyandprevalenceofpollutionpresentstheworldwithmanyextremelydauntingp
Tom’sproblemisthathemusthaveusedacomputerforalongtime,buthiseyesfeeldryandtired.Thetwosolutionstheydisc
UnitedStatesGovernmentWhatisthediscussionmainlyabout?
"Whenpeoplesucceed,itisbecauseofhardwork.Luckhasnothingtodowithsuccess."Doyouagreeordisagreewiththequotat
InQuestion5,youwillbeaskedtolistentoaconversationandexplainaproblemaswellasthesolutionsthatareproposed.A
MaryMcCarthy’ssatiresarecouchedintheprosestylethathasaclassicprecision.
随机试题
1900年《德国民法典》在资产阶级民法史上第一次规定了()
治疗痰热郁肺型肺胀的首选方剂是
X线片上正常内听道的宽度约为
职业病危害因素按其来源分为()类。
背景资料:某公司中标承建中压A燃气管线工程,管道直径DN30,长26km,合同价3600万元。管道沟槽开挖过程中,遇到地质勘察时未探明的废弃砖沟,经现场监理工程师口头同意,施工项目部组织人员、机具及时清除了砖沟,并换填级配砂石进行处理,由此导致合同外工作
生产投入一般可分为()。
甲中合资公司2004年业务收入总额为2000万元,其应酬费实际扣除600万元,税法允许扣除的应酬费为()万元。
M企业购入一台生产用设备并投入使用,设备价款45万元,进项税额7.65万元。M企业以银行存款支付35万元,余款以商业承兑汇票承付。对于该项经济业务的会计处理,正确的有()。
汉代提出审理案件应贯彻“原心定罪”原则的思想家是()。
Geneticallyengineeredcropsaresafeforhumansandanimalstoeatandhavenotcausedincreasesincancer,obesity,gastrointe
最新回复
(
0
)