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
2022-06-18
65
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
comes 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 are able to_________.
选项
A、make organic compounds
B、get fresh air
C、produce inorganic nitrogen compounds
D、carry out activities without sugar and vitamins
答案
A
解析
根据第一段第六句“Roots are capable of making their own proteins and other organic compounds.”可知,选项A为答案。
转载请注明原文地址:https://kaotiyun.com/show/6buO777K
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
"LayersofSocialClass"Takentogether,income,occupation,andeducationaregoodmeasuresofpeople’ssocialstanding.Usi
Whatistheprofessor’sopinionofthepaperwrittenbyresearchersinSpain?
ReconstructingAncientEnvironmentsP1:Archaeologyisparticularlyimportantforlearningaboutprehistoricsocieties,forwhom
ReconstructingAncientEnvironmentsP1:Archaeologyisparticularlyimportantforlearningaboutprehistoricsocieties,forwhom
SumerianContributionsP1:Beforeabout4500B.C.,lowerMesopotamia,thewholeplainbetweenandoneithersideoftheTigrisa
SumerianContributionsP1:Beforeabout4500B.C.,lowerMesopotamia,thewholeplainbetweenandoneithersideoftheTigrisa
BirdSongP1:Birdsonghasneverlackedadmirersdrawnbyitsaestheticqualities.Buttoscientists,birdsongisalsoofinte
Theonlyproblemwiththedebatelastweekwasthatthebeginningsoundedmorelikeapersonalattackthanadispassionate,inte
WhatWeDo我们做的事情TheHumourFoundationisanationalcharityestablishedin1997topromotethehe
随机试题
欲做一个容积为Vm3的无盖圆柱形储粮桶,底用铝制。侧壁用木板制,已知每平米铝价是木板价的5倍,问怎样做才能使费用最少。
一患者从2米高处跌下二天,颏部着地,神志清,无头痛,呕吐史,两侧耳前区压痛明显肿胀,开口轻度受限,前牙开抬,应考虑诊断为
A.癌前病变B.早期胃癌C.良性肿瘤D.恶性肿瘤E.肉瘤仅浸润黏膜层及黏膜下层的胃肠道癌称
关于民事诉讼二审程序的表述,下列哪一选项是错误的?()(司考.2012.3.43)
下列各种预算中,将费用项目分为不可避免费用项目和可避免费用项目。又进一步分为不可延缓费用项目和可延缓费用项目的预算是()。
我国中小学开设的语、数、外等课程属于()
(2010年联考.9月.22)
下列过程的功能是:通过对象变量返回当前窗体的Recordset属性记录集引用,消息框中输出记录集的记录(即窗体记录源)个数。SubGetRecNum()DimrsAsObjectSetrs=Me.Recordset
AsanEnglishmajorstudent,IthinkbusinessEnglishismorepracticalthanotherfields.
FilmisamediumthatmighthavebeenespeciallymadeforAmerica,avastcountrywhich,bythebeginningofthetwentiethcentu
最新回复
(
0
)