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
32
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.
Roots have the ability to______.
选项
A、make proteins
B、obtain fresh air
C、produce inorganic nitrogen
D、carry out activities without energy
答案
A
解析
细节题型。见第一段第六句:Roots are capable of making their own proteins and otherorganic compounds.所以选项A是答案。
转载请注明原文地址:https://jikaoti.com/ti/XfPYFFFM
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
A、ShehascompletedherprojectB、SheneedssomehelpfinishingtheprojectC、HereconomicsclassnolongermeetsD、Themanshou
FamilyMattersThismonth,Wyomingpassedabillthatwouldgivelegalteethtothemoralobligationtosupportone’sparent
A、Sheexpectstheweathertobenicenextweekend.B、Sheforgotshehadsomuchstudyingtodo.C、Sheusuallyhandsinherassig
HudsonRiverSchoolTheHudsonRiverSchoolencompassestwogenerationsofpaintersinspiredbyThomasCole’sawesomelyRomantic
ParkandBurgess’smodelhascometobeknownasthe"concentric-zonemodel"(representedbythefigure).Becausethemodelwaso
Youwillnowbeaskedtogiveyouropinionaboutafamiliartopic.Giveyourself15secondstoprepareyourresponse.Thenrecor
Thesethreeexplanationsofinfantileamnesiaarenotmutuallyexclusive;indeed,theysupporteachother.Physiologicalimmatur
Peopleworkbecausetheyneedmoneytolive.Whataresomeotherreasonsthatpeoplework?Discussoneormoreofthesereasons.
Dreamshavealwaysheldauniversalfascination.Someprimitivesocietiesbelievethatthesoulleavesthebodyandvisitsthes
A、WrittenArabicandpan-Arabic.B、ClassicalArabicandwrittenArabic.C、ModemArabicandwrittenArabicD、ModemArabicandcol
随机试题
Haveyoueverbeentemptedtocutacornerortotaketheeasiestroute,thoughyouknowitmaynotnecessarilybethebestone?
下列各项中,哪种风湿性疾病无晨僵及对称性多关节炎症状
某工程划分为3个施工过程在5个施工流水段组织加快的成倍节拍流水施工,流水节拍值分别为4,2,6天,该工程的施工总工期为()天。
根据资源税有关规定,下列说法符合资源税纳税地点规定的是()。
下列关于股份支付会计处理的表述中,正确的有()。
下列反映购买者具有较强议价能力的有()。
关于长白山天池,下列说法正确的是()。
内隐记忆
某带权有向图如图3-67所示。若忽略边上的权,并将其看做AOV网,那么该AOV网的拓扑排序为(1)。若将该图视为AOE网,那么该AOE网的关键路径有(2)条,其长度为(3)。该AOE网的所有关键活动共有(4)个,V5的最早开始时间和最迟开始时间分
下列数据结构中,属于非线性结构的是()。
最新回复
(
0
)