相关试题
【判断题】
由于固氮酶对氧极度敏感，故固氮作用必须在严格厌氧条件下才能进行
【判断题】
凡能利用乙酸为唯一碳源或能源的微生物，必然存在乙醛酸循环
【判断题】
在化能自养菌中，呼吸链还具有产生还原力H的功能
【判断题】
微生物的次生代谢产物是微生物主代谢不畅通时，由支路产生的
【判断题】
在非循环光合作用中，系统I不能产生ATP
【判断题】
在代谢调节中，反馈抑制具有作用较间接、效果较缓慢等特点
【判断题】
催化初级代谢和次级代谢产物合成的酶专一性和稳定性均较强
【判断题】
生物体的遗传型的表现形式为特定的核苷酸序列
【判断题】
表型是指某一生物体所具有的一切外表特征及内在特性
【判断题】
生物体变异所产生的新性状不是稳定的，可遗传的
【判断题】
生物体的饰变是发生在转录和翻译水平的表型变化，是不遗传的
【判断题】
生物体的终止密码子包括UGA、UAG和UGG
【判断题】
转化作用中，感受态细胞采取可逆的方式吸纳DNA
【判断题】
基因重组的本质是遗传物质的交换和重新组合
【判断题】
转发作用发生的关键是细胞处于敏感状态也就是所谓的感受态
【判断题】
革兰氏阳性细菌比革兰氏阴性细菌更难形成感受态细胞
【判断题】
局限性转导中，被转导的DNA片段是溶源化位点附近的所有基因
【判断题】
接合作用是由染色体上的DNA编码控制的
【判断题】
oriT位点是F因子转移发生的起始位点
【判断题】
在Hfr×F-杂交过程中，由于转移过程不可控因子较多，导致Hfr DNA难以全部进入受体细胞
【判断题】
接合作用指的是细胞之间直接接触产生的遗传信息的转移和重组
【判断题】
质粒是原核生物染色体外的小型环状DNA分子
【判断题】
一般认为，感受态出现在细菌生长的最高生长期
【判断题】
真菌的营养体主要为多倍体，因此有性生殖也是通过多倍体细胞融合进行
【判断题】
子囊孢子可以直接反映减数分裂的结果，是良好的遗传分析材料
【判断题】
异核体的形成可以通过自发突变和性细胞融合而形成
【判断题】
原生质体融合可以发生在种间、属间和科间水平
【判断题】
真核生物通过减数分裂形成遗传物质的重组
【判断题】
遗传工程中所用的载体主要包括质粒和噬菌体
【判断题】
遗传工程中所用的载体一个基本特性是具有多种选择性标记，以方便区别
推荐试题
【单选题】
对细胞的概念，近年来比较普遍的提法是：有机体的___
A. 形态结构的基本单位
B. 形态与生理的基本单位
C. 结构与功能的基本单位
D. 生命活动的基本单位
【单选题】
自然界的生物可以分为三大类，这就是___
A. 动物、植物与微生物
B. 海洋生物、陆地生物与高山生物
C. 动物、植物与昆虫
D. 高等生物、低等生物与微生物
【单选题】
香樟是一种在长江三角洲地区常见的树种，它是属于 ___
A. 常绿针叶树种
B. 落叶针叶树种
C. 常绿阔叶树种
D. 落叶阔叶树种
【单选题】
老虎与豹是属于同一科大动物。下列动物中也属该科的是___
【单选题】
生物是人类不可缺少的“朋友”，但目前正遇到___
A. 人工培育威胁
B. 种类减少威胁
C. 自相残杀威胁
D. 天外来客威胁
【单选题】
被发现在南非的古沉积岩中，地球上最早出现的绿色植物是___
A. 蕨类植物
B. 地衣
C. 蓝藻
D. 苔藓
【单选题】
植物、藻类利用叶绿素产生的光合作用过程中，在可见光的照射下，能将二氧化碳和水转化为有机物，释放出的是 ___
【单选题】
呼吸作用是生物体内的有机物在细胞内经过一系列的氧化分解，在释放出能量的同时，最终生成的主要是 ___
A. 氧气
B. 二氧化碳
C. 氮气
D. 不知道
【单选题】
晚上，植物与动物都不应该放入卧室内，要将其移到卧室外，这是因为它们会降低卧室内的___
A. 空气温度
B. 空气湿度
C. 氧气浓度
D. 氮气浓度
【单选题】
杂交优势往往在第几代杂交种子中表现最明显。___
【单选题】
以下不属于人体增强技术类型的是___
A. 短暂性增强
B. 持续性增强
C. 结构性增强
D. 内在增强
【单选题】
大陆漂移学说是由谁提出的___
A. 勒比雄
B. 魏格纳
C. 赫斯
D. 李四光
【单选题】
(1)Whieh of the following descriptions about the characteristics of physiology is wrong？___
A. It is the study of how living organisms work.
B. It illustrates the discipline of the development and the evolution of disease and the essence of disease.
C. It is to study the living phenomena and the function activities of living organs.
D. It is to explain how they are regulated and integrated.
【单选题】
(2) Which of the following are specialized in producing force and movement?___
A. muscle cells
B. connective tissues
C. nerve cells
D. epithelial cells
【单选题】
(3)The fluid environment surrounding each cell is called the___
A. intracellular fluid
B. intracellular fluid
C. internal environment
D. external environment
【单选题】
(4) Which of the following is not the fundamental characteristic of living organisms?___
A. metabolism
B. adaption
C. reproduction
D. passive diffusion
【单选题】
(5)Whicl of the following is a physiological process with negative feedback?___
A. blood coagulation
B. process of passing urine
C. sino-aortic baroreceptor reflex
D. process of parturition
【单选题】
(6)Which of the following is not the characteristic of regulation by hormone?___
A. diffusenin nature
B. longer in duration
C. accurate in action
D. action in overcorrection
【单选题】
7)Which of the following is not the characteristic of cells?___
A. They are bound by the plasma membrane
B. They have the ability to break down large molecules to smaller ones to Liberate energy for their activities
C. They possess a nucleus which contains genetic information in the form of deoxyribonucleicacid(DNA).
D. Living cells can not transform materials.
【单选题】
8)The breakdown of large molecules to smaller ones is called___
A. respiration
B. anabolism
C. catabolism
D. absorption
【单选题】
9) Which of the following descriptions about the characteristics of nervous regulation is wrong?___
A. It responds fast
B. It acts exactly
C. It responds slowly.D.
D. uration is short
【单选题】
10)Which of the following descriptions about the control of body function is wrong?___
A. Homeostasis is kept by feedback control.
B. Negative feedback minimizes the changes, leading to stability.
C. Positive feedback is not useful.
D. Feed-forward makes human body foresee and adapt itself to the environment promptly.
【单选题】
(1)Which of the following parts of knowledge of drugs should be included in pharmacology?___
A. The effects of drugs on man
B. The correlation of biological activity with chemical structure
C. The history, source, physical and chemical properties, compounding, biochemical and physiologicaleffects, mechanisms of action, absorption, distrilbution, biotransformation and excretion.
D. The prevention, recognition, and treatment of drug poisonings
【单选题】
(2)Which of the following is what a clinician is primarily interested in according to the text?___
A. Drugs which can be reasonably limited to those aspects that provide the basis for their rational clinical use
B. Chemical agents that are not used in therapy but are commonly responsible for household and industrial poisoning as well as environmental pollution
C. Drugs which are useful in the prevention,diagnosis and treatment of human disease,or in the prevention of pregnancy.
D. rugs which are useful in the prevention, diagnosis and treatment of human disease, or in the prevention of pregnancy.
【单选题】
(3)Why was the physician not interested in pharmacognosy?___
A. He didn't have to select the proper plants for his prescription
B. He had a broad botanical knowledge
C. Fewer drugs were obtained from natural sources
D. Natural drugs had little difference with synthetic ones
【单选题】
(4)Which of the following is the best way of studying pharmacology for medical students and practitioners?___
A. to have a broad botanical knowledge
B. to select a plant and its preparation
C. to have the ability to purify natural plants
D. to have curiosity that stimulates them to learn about sources of drugs
【单选题】
(5)What are the tasks related to medicines almost complete!y delegated to the pharmacists now?___
A. the physical and chemical properties of medicines
B. the preparing, compounding, and dispensing of medicines
C. dosage forms of medicines available
D. the therapeutic and other uses of medicines
【单选题】
(6) What is a main unique aspect of pharmacodynamics?___
A. Pharmacodynamics is an experimental medical science
B. Pharmacodynamics is focused on the characteristics of drugs
C. Pharmacodynamics borrows freely from both the subject matter and the experimenta techniques of physiology, biochemistry, microbiology, genetics and pathology
D. Pharmacodynamics correlates the entire field of preclinical medicine
【单选题】
7) What time of history does pharmacodynamics date back to?___
A. the second half of the seventeenth century
B. the second half of the eighteenth century
C. the second half of the nineteenth century
D. the second half of the twentieth century
【单选题】
8)What does the research on pharmacodynamics focus on?___
A. study of clinical effect of drugs
B. study of the process of drugs in the body
C. study of the effect and the mechanism of drugs on the body
D. study of the correlation of the actions and effects of drugs with their chemical structure
【单选题】
(9)Which of the following is true when drugs are selected?___
A. It has to be based in part on legal reasons.
B. It has to be based in part on ethical reasons.
C. It has to be based in part on the pharmacological evaluation in man
D. It has to be based in part on the pharmacological evaluation in animals
【单选题】
(10)Why are chemotherapeutic agents useful in therapy?___
A. They stimulate or depress biochemical or physiological function in man in a sufficiently reproducible manner to provide relief of symptoms or, ideally, to alter favorably the course of disease
B. They can produce desired effects with only tolerable undesired effects
C. They have only minimal effects on man but can destroy or eliminate parasites
D. The selectivity of their effects is one of their most important characteristics
【单选题】
1)H. Mario Geysen initially used parallel synthesis as a quick way to identify which small_____ of any given large protein bound to an antibody.___
A. division
B. pieces
C. part
D. fragment
【单选题】
2)Chemists often start a combinatorial synthesis by attaching the first set of building blocks_____ to microscopic beads made of polystyrene.___
A. solid
B. inert
C. soft
D. active
【单选题】
3）The chemical reactions required to link compounds to the beads and later to detach them____ to the synthesis proces.___
A. induce complications
B. make easy
C. introduce complications
D. introduce easy
【单选题】
4)In a parallel synthesis, all the products are_____ separately in their own reaction vessels.___
A. combined
B. assembled
C. joined
D. assorted
【单选题】
(5)In many laboratories today, robots assist with the routine work of parallel synthesis, such as small___ amounts of reactive molecules into the appropriate wells.___
A. sending
B. transporting
C. delivering
D. giving
【单选题】
(6)Scientists can pull out from the mixture the beads that bear biologically active molecules and then,using sensitive detection techniques,___ the molecular makeup of the compound attached.___
A. determine
B. make sure
C. find
D. search
【单选题】
(7)Most pharmaceutical companies today continue to___ parallel synthesis. Which of the following is not appropriate to be filled in the blank?___
A. count in
B. count on
C. depend on
D. rely on
【单选题】
(8)Once they identify a promising substance, they___ make many one-at-a-time modifications to the structure.___
A. laboriously
B. hardly
C. easy
D. effectively
