双语课问答题

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2.生物的特点?Characteristics of life(1)Living things share basic structural similarities. (2)All living things are made up of complex, structural units called cells(3)Any unit that is capable of functioning independently is called an organism (生物体)(4)All living things share the structural and functional characteristics. (5)Organisms are special kinds of matter that interact with their surroundings at several different levels DNA的四个特点DNA has four properties to function (1)Replicate (复制) by directing the manufacture of copies of itself (2)Mutate (变异) or chemically change and transmit these changes to future generation (3)Store information that determine the characteristics of cells and organisms (4)Use this information to direct the synthesis (合成) of structural and regulatory proteins 细胞分裂的功能Function of cell division Function of cell division includes:to divide, maintain the body and to repair 19.有丝分裂分几个阶段,每个阶段的特点The stages of mitosis Interphase (间期) Growth and the production of necessary organic compounds occur during this phase prophase (前期) Prophase 前期 is the first stage of mitosis, chromosomes appear, nuclear membrane present, centrioles (中心粒) separate and move to opposites poles, spindle will shortly begin to form Early prophase metaphase (中期), During metaphase, the second stage in mitosis, the chromosomes align at the equatorial plane. Anaphase 后期Pairs of chromatids (染色单体) separate after the centromeres (着丝点)replicate. Daughter chromosomes are separating and moving toward the poles and the cell will begin cytokinesis (细胞质分裂) Telophase 末期The spindle dissembles, nucleolus (核仁) and nuclear membrane from, daughter cells are formed 24.减数分裂分为那几个阶段Meiosis Meiosis I is artificially divided into four phases: prophase I, metaphase I, anaphase I, and telophase I. 25.减数分裂I和II有什么不同 引起遗传差异的原因是什么Five factors influence genetic variation in offspring: mutations (变异), crossing-over (交叉), segregation (分离), independent assortment (独立分配 ) and fertilization (受精) 30.鉴定物种有哪些方法What are the methods identified species (1)Morphological species concept is the method of using structural characteristics to identify species.(2)Differences in behavior among animals 2.一个物种随时间的变化受哪几个因素影响To determine how a species changes over time: Environmental factors that affect organisms Sexual reproduction among the individuals in the gene pool The generation of genetic variety 遗传差异within gene pool 4.推动自然选择的因素有哪些Spontaneous mutation 自发突变 are changes in DNA that can not be tied to a particular causative agent 致病因子Cosmic radiation 宇宙射线 or naturally occurring mutagenic 诱变 chemicals might be cause of these mutations 33.为什么遗传学上截然不同的族群存在Why Genetically Distinct Populations Exist The first mechanism: local populations that occupy sites that differ greatly would be expected to consist of individuals having gene combinations 基因组合 suited to local conditions. A second mechanism that tends to create genetically distinct populations with unique allele frequencies involves the founding of a new population. A third cause of local genetically-distinct populations relates to the past history of the population. A fourth factor is the presence of barriers to free movement 5.影响进化的一些过程 1.Selecting agents: specific environmental factors that favor certain characteristics 2.Differential survival 差别生存 3.Differential reproductive rates 4.Differential mate selection 能量三大金字塔、其局限性 A.The pyramid of numbers 数量金字塔 Count the number of organisms at each trophic level Shortcoming : the organisms at different trophic levels may have different sizes B.The pyramid of biomass 生物量金字塔 Biomass (生物量): dry weight of all the organisms at one trophic level Shortcoming: accumulating time difference C.The pyramid 金字塔 of energy Two fundamental physical laws: 1. Energy is neither created nor destroyed 2. When energy is converted from one form to another some energy escapes as heat At each trophic level, the energy content decreases by about 90% 1.描述一个种群的特点有哪些 Age distribution 年龄分布 Mortality 死亡率 Natality 出生率 Population density 种群密度 Sex ratio 性别比例 3.几大种间关系和例子 Predation (捕食) Parasitism (寄生) Commensalism (共栖) Mutualism (互利共生) Competition (竞争 4.几大循环The carbon cycle (碳循环) The hydrologic cycle (水循环) The nitrogen cycle (氮循环) The phosphorus cycle (磷循环) 4.不同类型的学习行为有哪些,其中联想行为有哪些1.Habituation (习惯化) 2.Association (联想):a. classical conditioning, b. operant conditioning, c. observational learning 3.Exploratory learning 4.Imprinting (印记) 5.Insight (顿悟) 5人类对群落的影响和例子The impact of human actions on communitiesIntroduced species a. Predator controlb. Habitat destructionc. Pesticide use: DDTd. Biomagnification (生物放大作用) 3.种群增长曲线有哪几个部分组成 Lag phase (迟滞期) Exponential growth phase 指数增长期 Stable equilibrium phase 稳定平衡期 5.限制种群增长的因素有哪些 Environmental resistance 环境阻力: all the limiting factors acting on a population Carrying capacity 承载能力: maximum population that an area can support 6.限制人口增长的因素有哪些 一.Available raw materials A.Food There are many reason why the people can’t get food or won’t eat: culture,