首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Many microorganisms survive such environmental stresses as heat, cold and desiccation not by rapid rates of mitosis, but
Many microorganisms survive such environmental stresses as heat, cold and desiccation not by rapid rates of mitosis, but
admin
2011-01-17
45
问题
Many microorganisms survive such environmental stresses as heat, cold
and desiccation not by rapid rates of mitosis, but by producing specialized cells
designed to persist in a dormant state in hostile environments. Most fungi, for
Line example, yield single-celled spores, which, through wind distribution, can
(5) survive for long periods of time before germinating and sprouting fungal
filaments of their own. Other types of bacteria produce a special type of spore
called an endospore, capable of withstanding such extremes as boiling and
freezing temperatures, and even ultraviolet radiation.
Though research results remain tentative, several factors may protect
(10) endospores from environmental stress: they have a low water content, unusual
proteins and a tough spore coat absent in mature bacterial cells. When garden
fruits and vegetables, which may contain botulism endospores, are preserved by
canning at boiling temperatures, we know that these spores survive the heat
and sprout in the food, and as a result, the bacteria generate the botulism toxin
(15) that can lead to food poisoning-proof of their magnificent resilience.
The author’s primary purpose in the passage is to
选项
A、describe the limits of biologists’ understanding of the phenomenon of cellular dormancy
B、explain how certain organisms have adapted to withstand environmental adversity
C、contrast the survival techniques of two organisms which use dormancy to survive hostile environments
D、explain why endospores are so adept at surviving the traditional canning process
E、suggest which methods are effective for killing endospores at which are not
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/zxjO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
In1866,sailorsonaGermanshipcalledPaulathrewabottlewithamessageintowatershundredsofmilesoffthewesterncoast
Themostimportant______ofhisspeechwasthatweshouldallworkwhole-heartedlyforthepeople.
Thepresidentsoftheblockassociationtriedtoconvinceherneighborstheyshouldjoinforcestopreventcrimeintheneighbor
FORESTALL:
SAGE:JUDGMENT::
Enlightenmentthinkers______faithintheabilitiesofmankindtouncoverandsolvepressingproblemsofthetime,andthusthey
FLEDGLING:
ADULATION:
TheshortcomingsofMr.Brooks’analysisare______his______inexplainingfinan-cialcomplexityandthesheerimportanceofhi
Throughitsstateassociations,theAmericanMedicalAssociationcontrolledwhocouldbecomeaphysiciananddominated______prof
随机试题
下列不适合做PNF伸展练习的肌肉是()。
计算定积分
下列情况不宜使用磺胺药,但除外:
门萨的成员都很聪明,小李很聪明,所以小李可以加入门萨。以下哪项与题干逻辑错误一致?()
海派文化的重要标志是()。
简述幼儿自我评价的发展的特点。
马克思认为:“一种商品变成货币,首先是作为价值尺度和流通手段的统一。换句话说,价值尺度和流通手段的统一是货币。”这句话说明了()
[*]
Credibilityaboutmessagesishigh,becausetheyarereportedinindependentmedia.Anewspaperreviewofamoviehasmorebeli
Europeisnotagender-equalityheaven.Inparticular,thecorporateworkplacewillneverbecompletelyfamily-friendlyuntilwo
最新回复
(
0
)