首页
登录
职称英语
About fifty years ago, plant physiologists set out to grow roots by themselv
About fifty years ago, plant physiologists set out to grow roots by themselv
游客
2024-01-01
11
管理
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. [br] According to the passage, what is ATP?
选项
A、A biochemical process.
B、The tip of a root.
C、A chemical compound.
D、A type of plant cell.
答案
C
解析
推断题型。第一段提到(块)根需要sugar and the usual minerals and vitamins,但不需要 organic nitrogen compounds,因(块)根可自造所需的蛋白质和其它organic compounds;这里反复提到的organic compounds应包括the high energy compound ATP(见第一段倒数第二句);因此可推断出选项C(一种化合物)为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3325546.html
相关试题推荐
Astronautsreceive(extensive)trainingtoprepare(themselves)(both)physicall
Fromcolonialtimes,UnitedStatespropertyownersagreedtotaxthemselvesont
Somepeoplethinkthattheycanlearnbetterbythemselvesthanwithateach
Somepeopleprefertoworkforthemselvesorownabusiness.Othersprefertowo
Aboutfiftyyearsago,plantphysiologistssetouttogrowrootsbythemselv
Aboutfiftyyearsago,plantphysiologistssetouttogrowrootsbythemselv
Aboutfiftyyearsago,plantphysiologistssetouttogrowrootsbythemselv
Aboutfiftyyearsago,plantphysiologistssetouttogrowrootsbythemselv
Aboutfiftyyearsago,plantphysiologistssetouttogrowrootsbythemselv
Aboutfiftyyearsago,plantphysiologistssetouttogrowrootsbythemselv
随机试题
LifesaverHeroine—FlorenceNightingale"Theultimate
Originalusagereferstoriversthat______.[br]Whatisn’tsaidaboutthecas
对于可摘局部义齿的单臂卡环,下列错误的是A.单臂卡环在前后牙都可选用 B.单臂
当旅游者离开当地前往下一站时,地陪应在旅游者( ),核实旅游团(者)离开的交通
在“异分母分数加减法”的课后作业中,有的学生出现这样的错误: (1)分析导致
下列不属于宏观分析中行业分析的主要目的是()。A.分析政府政策对行业的影响
()是指在证券交易所内按一定的时间、一定的规则集中买卖已发行证券而成的市场
肝硬化患者肝功能失代偿期的典型表现是A、恶心、呕吐 B、蜘蛛痣 C、腹痛、腹
运输需求价格是由运输货物对货主的()所决定的。 A.均衡效用 B.边际效用
有线电视系统中,把信号分出一部分到支路上去的设备是()。A.分支器 B.分配
最新回复
(
0
)