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
52
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
Anintroductorysentenceforabriefsummaryofthepassageisprovidedbelow.CompletethesummarybyselectingtheTHREEanswe
ChemistryAccordingtotheprofessor,whyischemistrysometimescalledthecentralscience?
NarratorListentoatalkonhomeautomationinamechanicalengineeringclass.Nowgetreadytoanswerthequestions.Y
HumanMigrationHumanmigration:thetermisvague.Whatpeopleusuallythinkofisthepermanentmovementofpeoplefromon
Thespeaker’sfinancialproblemisaboutthelivingexpensesincollege.Hethinksthatthetuitionfeesandlivingcostsarere
Duringalongholiday,Iprefertostayathomebecauseofthefollowingreasons.First,Icanmakegooduseofthetimetoclea
PhilosophyofLogicalAnalysisModernphysicsandphysiologythrowanewlightupontheancientproblemofperception.Ifthere
InQuestion5,youwillbeaskedtolistentoaconversationandexplainaproblemaswellasthesolutionsthatareproposed.A
MaryMcCarthy’ssatiresarecouchedintheprosestylethathasaclassicprecision.
AstheemblemofTaoism,thesignofTaijiplaysanimportantroleinChineseculture.
随机试题
土工合成材料刺破强力试验适用于()。
SHECA数字证书根据应用对象可将其分为
女性,30岁,哮喘史11年,近1年来反复发作,午夜或清晨时易发作,春季和梅雨季节尤其好发。体检:一般可,叙述病史连贯而无气急,两肺散在哮鸣音。有关糖皮质激素治疗哮喘的作用机制不正确的是
多发于壶腹部或伞部妊娠绒毛组织附着于附近脏器
患者,女,15岁。两周前身发疮痍,恶风发热。前天起眼睑浮肿,继而延及全身,皮肤光亮,尿少色赤,舌质红,苔薄黄,脉浮数。此病的证机概要是
某企业用银行存款10万元购入一项管理用专利权的所有权,该企业经营期为20年,该项专利权法律规定的有效年限为10年。两年后,该企业将上述专利权的所有权转让,取得转让收入10万元,转让专利权涉及的营业税税率为5%。要求:根据上述资料,编制该企业购入专利
某企业采用售价金额法核算库存商品成本,本月月初库存商品成本为18万元,售价总额为22万元,本月购进商品成本为16万元,售价总额28万元,本月销售商品收入为15万元,该企业本月结转销售商品成本总额为()万元。
具体行政行为的效力不包括()。
在Windows操作系统中,与Web访问无关的组件是__________________。
A、 B、 C、 D、 A
最新回复
(
0
)