相关试题
【判断题】
微生物营养是微生物获得和利用营养物质的过程
【判断题】
组成微生物细胞的化学元素来自微生物生长所需要的营养物质
【判断题】
水的主要功能是维持微生物细胞的膨压和作为生化反应的溶剂
【判断题】
氮素营养物质不仅用来合成细胞中的蛋白质，还可以为部分微生物提供能源
【判断题】
微生物的营养类型可以根据其生长所需要的碳源物质的性质和氮源物质的性质不同而划分成四种基本营养类型
【判断题】
光能有机异养型细菌生长时还需要少量的维生素才可以生长好
【判断题】
属于化能无极自养型的微生物生长比较迟钝
【判断题】
划分有机营养型生物和无机营养型生物的标准在于它们是否能利用CO2
【判断题】
划分有机营养型生物和无机营养型生物的标准在于它们是否以CO2作为唯一碳源
【判断题】
原养型和营养缺陷型的微生物是根据对生长因子的需要来划分的
【判断题】
腐生型和寄生型的微生物属于化能有机异养型
【判断题】
腐生型和寄生型的微生物属于化能无机异养型
【判断题】
基团转位运输方式中，除了在运输过程中物质发生化学变化这一特点外，其它特征均与主动运输方式相同
【判断题】
细胞中的四种有机元素的干重占细胞干重的95%以上
【判断题】
微生物细胞中主要矿质元素是P,S,K,Mg,Mn,Co等六种元素
【判断题】
促进扩散和主动运输均需载体蛋白参与，载体蛋白与被动运输物质亲和力大小的改变是由于载体蛋白构型变化而引起的，而载体蛋白的构型变化需要消耗能量，所以两种运输方式均需消耗能量
【判断题】
单纯扩散不能进行逆浓度运输，而促进扩散则能进行逆浓度运输
【判断题】
只有营养物质的吸收方式涉及物质的运输这个问题，而代谢产物的分泌则不涉及到物质的运输这个问题
【判断题】
微生物营养物质的选择吸收主要是通过细胞膜来实现的
【判断题】
底物水平磷酸化不需要生物膜的参与，不需要光和氧，是厌氧微生物的主要能量来源
【判断题】
体内生成ATP只有底物水平磷酸化和氧化磷酸化2种途径
【判断题】
在ATP分子中，磷酸之间的磷酸键断裂，自由能的变化与普通的磷酸键断裂差不多
【判断题】
底特水平磷酸化只存在于发酵过程中，不存在于呼吸作用过程中
【判断题】
光能营养微生物的光合磷酸化没有水的光解，不产生氧气
【判断题】
发酵产生的能量和呼吸作用产生的能量差不多
【判断题】
发酵作用的最终电子受体是有机化合物，呼吸作用的最终电子受体是无机化合物
【判断题】
发酵作用是专性厌氧菌或兼性厌氧菌在无氧条件下的一种有机物生物氧化形式，其产能机制都是底物水平磷酸化反应
【判断题】
延胡索酸呼吸中，玻珀酸是末端氢受体延胡索酸还原后生成的还原产物，不是一般的中间代谢产物
【判断题】
糖酵解是指微生物以葡萄糖为底物，经过一系列反应转化为丙酮酸的过程
【判断题】
葡萄糖降解生成丙酮酸以后，丙酮酸进一步彻底氧化为CO2
【判断题】
无氧呼吸和有氧呼吸一样也需要细胞色素等电子传递体，也能产生较多的能量用于命活动，但由于部分能量随电子转移传给最终电子受全，所以生成的能量不如有氧呼吸产生的多
【判断题】
所有的自养微生物同化CO2都是通过卡尔文循环
【判断题】
CO2是自养微生物的惟一碳源，异养微生物不能利用CO2作为辅助的碳源
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【单选题】
If you grow too fast your entire economy could completely shut down and bring growth to a(n) ___.
A. halt
B. cease
C. peak
D. epidemic
【单选题】
I tried my best to drive inside in order to avoid the edges that might make me ___ the steep slope.
A. slip down
B. settle down
C. bring down
D. turn down
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When the driver heard that there was a bomb on the bus, he immediately ___ to the side of the highway and radioed the police.
A. put out
B. took off
C. pulled over
D. slipped off
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She was very ___ to become a manager in our customers’ office, but finally accepted our offer.
A. eager
B. intelligent
C. ridiculous
D. reluctant
【单选题】
In the race, it looked as if he would be the first, but then another young man who was close behind him put on speed and ___ by a few seconds.
A. beat him for it
B. beat him to it
C. beat him up
D. beat it to him
【单选题】
It is really helpful to have someone like you that we can ___ and count on during difficult times.
A. lean on
B. get to
C. hang on
D. get by
【单选题】
Women have a greater ability to ___ names with faces than men do, and they are also better at recalling lists.
A. associate
B. compare
C. engage
D. involve
【单选题】
He was always ready to help others and managed to ___ his friends ____being hurt.
A. expose … to
B. confine …to
C. restrict … from
D. shield … from
【单选题】
Older people are less likely to be ___ their negative emotions (情绪) and more likely to focus on the positive.
A. reserved for
B. caught up in
C. beat up to
D. counted on
【单选题】
I don’t have any bandage, so I have to ___ pressure to the wound to keep the bleeding down.
A. apply
B. involve
C. fulfill
D. establish
【单选题】
It is important that whichever candidate (候选人) is picked the loser should accept the defeat ___.
A. in advance
B. with great pride
C. with good grace
D. in large part
【单选题】
___ that new homes cost more than older homes, but that is not true across the country anymore.
A. It used to be
B. It is used to be
C. It used to being
D. It is used to being
【单选题】
The boss ___ his employees to work longer hours as the company is dreadfully short of staff at present.
A. called on
B. signed up
C. cared for
D. set up
【单选题】
The president’s visit and ___ discussions led to a plan that aimed to improve the trade relations between the two countries.
A. emerging
B. subsequent
C. consequent
D. Submerging
【单选题】
The author ___ his general idea mainly through statistics and results obtained from a survey (调查) about auto customer services in the United States.
A. assumes
B. engages
C. illustrates
D. represents
【单选题】
People in this town starved, several buildings were bombed and crime ___ because you had to steal to eat.
A. eroded
B. reflected
C. released
D. soared
【单选题】
Olympic recognition for bodybuilding (健美) remains ___ since some argue that bodybuilding is not a sport because the actual contest does not involve the same sort of efforts as “real” sports.
A. controversial
B. conventional
C. characteristic
D. influential
【单选题】
Tom tried to justify his absence from the meeting by ___ that he had been ill that day.
A. admitting
B. advocating
C. claiming
D. citing
【单选题】
___ the huge financial benefits, biological companies have been rushing to set up laboratories and new research projects.
A. Aware
B. Aware of
C. Not aware
D. Not aware of
【单选题】
Unfortunately, ___ lack of funds, the studies he began just two months ago, had to be ended early.
A. out of
B. in addition to
C. owing to
D. to begin with
【单选题】
With a good command of English, he soon got ___ to working with British people.
A. accustomed
B. consistent
C. relevant
D. responsible
【单选题】
What needs to be ___ here is that language and culture interact, and that understanding of one requires understanding of the other.
A. altered
B. stressed
C. aroused
D. committed
【单选题】
Policies and organizations must be created to meet workers’ hopes, and to ___ new problems that inevitably arise between workers and managers.
A. compromise
B. ensure
C. undermine
D. resolve
【单选题】
To keep the wheels of industry turning, we produce consumer goods in endless quantities, and, in the process, are rapidly ___ our natural resources.
A. ignoring
B. collapsing
C. enduring
D. exhausting
【单选题】
As a person who loves peace, he is committed ___ realizing peace between countries.
A. of
B. about
C. for
D. to
【单选题】
Learning how to use chopsticks is easy for me, ___ learning how to conduct myself at the table is quite difficult.
A. whereas
B. however
C. therefore
D. besides
【单选题】
___ that the patient smokes 50 cigarettes a day, it would be reasonable to assume there is some lung damage.
A. To give
B. Giving
C. Given
D. Having given
【单选题】
Kenyan (肯尼亚的) women tend to vote for those who could provide them ___ the necessary food to live on.
A. of
B. with
C. for
D. about
【单选题】
___ all obstacles and failures, the scientist continued doing his experiments day and night.
A. In spite of
B. In contrast to
C. As a matter of
D. As a result of
【单选题】
I’m willing to ___ that a larger car would have cost more, but I still think we should have bought one.
A. withdraw
B. indicate
C. abandon
D. concede
【单选题】
Manufacturing (制造) companies spend millions of pounds on advertisements, trying to ___ customers that their products are better than those of other companies.
A. confine
B. convince
C. depress
D. reconcile
【单选题】
He is not the right person for the project: he is not very technically minded and ___, he does not have the sense of responsibility.
A. instead
B. yet
C. furthermore
D. nevertheless
【单选题】
Death rates declined in many places, partly because of the ___ in hunger.
A. decrease
B. myth
C. obstacle
D. burden
【单选题】
In deciding whether or not a situation is safe, pilots must be taught to assume that the worst will happen, and then to ___ whether there is a risk or not.
A. absorb
B. apply
C. assess
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【单选题】
The worker was not worried as he knew that if he gave up the job, there would be ___ opportunities for him to work somewhere else.
A. formative
B. marginal
C. vigorous
D. numerous
【单选题】
The research shows the region might ___ overheating (经济过热), but the policymakers so far appear to be relatively relaxed about the future of the economy.
A. catch a glimpse of
B. be at risk of
C. take a toll on
D. be free from
【单选题】
Measures have been taken to ensure that no student will have to ___ of college for economic reasons.
A. lay out
B. cancel out
C. drop out
D. stand out
【单选题】
Stress that is not treated can lead to significant medical illnesses, which ___ can lead to greater stress and even depression (抑郁症).
A. after all
B. in turn
C. on the contrary
D. at least
【单选题】
Narcissism (自恋) has its benefits in terms of self-belief and confidence, but it also tends to be ___ risky decision-making.
A. associated with
B. contrasted with
C. reserved for
D. relieved of
【单选题】
When Tom saw his doctor again, she suggested that maybe a more substantial lunch, like a sandwich, might ___ his desire to have snacks in the afternoon.
A. count on
B. cut back on
C. hold on to
D. contribute to
