生物专业英语unit6选择题.pptVIP

Lesson Six The origin and Diversity of Life 191001038 袁君婷 IV.Multiple Choice Finish each of the following sentences by circling the correct response. 1、Most cosmologists believe that the universe originated a.18 billion years ago b.4.5 billion years ago c.18 million years ago d.20 million years ago e.1.5 billion years ago 2.The main hypothesis on the origin of life on earth holds that . a. life arose spontaneously by chemical evolution生命是由化学物质进化而自发产生的 b. life arose by physical evolution meteorites brought prokaryotic cells to earth地球上的原核细胞来源于陨石 life arose by natural selection e. none of the above 3.By mimicking the conditions of early earth Urey and Miller showed that . monomer formation can occur 有机单体可形成 polymers can form多聚体可以形成 organic molecules disintegrate 有机分子的裂解 RNA replicates e. all of the above 4.Biologists believe that the first polymers were formed . in the earth‘s mantle在地幔 in primordial soup in prehistoric oceans在原始海洋 on clay or rock surfaces 在黏土或岩石的表面 e. in microspheres [ma?kr?(?)sf??(r)] 在微球体 5.The energy to drive organic polymerization may have come from . the sun the earth’s core地球的核心 ultraviolet light紫外线 [?ltr?va??l?t] ATP e. all of the above 6.According to what you have read in this chapter, life probably arose on the earth . About 5,000 years ago Between 3 and 4 billion years ago Between 2 and 3 billion years ago About 500 billion years ago e. About 10 billion years ago 7.Proteinoid microspheres can be produced . by heating amino acids通过氨基酸加热 by heating amino acids and exposing them to water通过加热氨基酸和水 from a solution of polymers多聚体的溶解 from lipids油脂 form coacervates细胞团聚体 amino acid [?,mi:n?u ‘?sid] 氨基酸 8.Ribozymes . [‘raib?zaim] 核酶（化学本质是RNA） are RNA molecules是RNA分子 act as catalysts 作为催化剂 can build RNA molecules可合成RNA分子 can carry out e