问题 解答题

如图是一个细胞的结构图,看图回答下列问题(“〔〕”内填字母,“-”上填文字):

(1)这是一个______(选填“植物”或“动物”)细胞,其依据是细胞中有〔A〕______;〔E〕______;〔C〕______.

(2)水稻苗吸收含硅的无机盐,而吸收含钙的无机盐少,是因为细胞具有〔B〕______的缘故.

(3)切西瓜时,流出的汁水是______,主要来自图中的〔E〕______.

(4)含有遗传物质的结构是______.

(5)细胞分裂时,首先是图中〔D〕______分裂成两个.

(6)______和______都是细胞中的能量转换器.

答案

(1)观图可知:A是细胞壁;B是细胞膜;C是叶绿体;D是细胞核;E是液泡;F是细胞质;此细胞有细胞壁、液泡和叶绿体,所以是植物细胞;

(2)细胞膜紧贴在细胞壁的内面,能控制物质进出,让对细胞有用的物质不能通过细胞膜出来,有害的物质也不能进入细胞;

(3)切西瓜时,流出来的汁液主要来自液泡中的细胞液,其内含有大量的水分、糖类物质及色素等;

(4)细胞核一般位于细胞的中央,里面有遗传物质;

(5)细胞分裂就是一个细胞分成两个细胞,分裂时细胞核先分成两个,随后细胞质分成两份,每份各含一个细胞核,最后动物细胞的细胞膜从中央向内凹陷,将原细胞缢裂为两个细胞;植物细胞在原来细胞的中央,形成新的细胞膜和细胞壁;

(6)细胞中的能量转换器有叶绿体和线粒体.叶绿体中的叶绿素能吸收光能,将光能转变为化学能,储存在它所制造的有机物中;线粒体能将细胞中的有机物在氧的参与下分解为二氧化碳和水,同时将有机物中的化学能释放出来,供细胞利用.动物是异养的,其细胞内不含能够进行光合作用的叶绿体,只有线粒体.绿色植物的细胞内含有两种能量转换器:叶绿体和线粒体

故答案为:(1)植物;细胞壁;液泡;叶绿体;(2)细胞膜;(3)细胞液;液泡;(4)细胞核;(5)细胞核;(6)叶绿体;线粒体.

选择题
单项选择题

Attempts to understand the relationship between social behavior and health have their origin in history. Dubos (1969) suggested that primitive humans were closer to the animals (1) they, too, relied’upon their instincts to stay healthy. Yet some primitive humans (2) a cause and effect relationship between doing certain things and alleviating (3) of a disease or (4) the condition of a wound. (5) there was so much that primitive humans did not (6) the functioning of the body, magic became an integral component ofthe beliefs about the causes and cures of heath (7) Therefore it is not (8) that early humans thought that illness was caused (9) evil spirit. Primitive medicines made from vegetables or animals were invariably used in combination with some form of ritual to (10) harmful spirit from a diseased body.

One of the. earliest (11) in the Western world to formulate principles of health care based upon rational thought and (12) of supernatural phenomena is found in the work of the Greek physician Hippocrates. The writing (13) to him has provided a number of principles underiying modern medical practice. One of his most famous (14) , the Hippocratic Oath, is the foundation of contemporary medical ethics.

Hippocrates also argued that medical knowledge should be derived from a (15) of the natural science and the logic of cause and effect relationships. In this (16) thesis, On Air, Water, and Places, Hippocrates pointed out that human well-being is (17) by the totality of environmental (18) : living habits or lifestyle, climate, geography of the land, and the quality of air, and food. (19) enough, concerns about our health and the quality of air, water, and places are (20) very much written in twentieth century.

15()

A.creation

B.expectation

C.perception

D.preference