首页
登录
职称英语
Many microorganisms survive such environmental stresses as heat, cold
Many microorganisms survive such environmental stresses as heat, cold
游客
2024-01-11
7
管理
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
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.
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://tihaiku.com/zcyy/3354032.html
相关试题推荐
A、carbondioxidetendstoalleviateenvironmentalhaze,whilesulfurousgasesus
Innosense______,thebillionaire’sfortunessurvivedyetanotherfinancialp
Manymicroorganismssurvivesuchenvironmentalstressesasheat,cold
Howanyfetussurvivesgestationhasbaffledscientistsfordecades:theembryo’
Manymicroorganismssurvivesuchenvironmentalstressesasheat,cold
Manymicroorganismssurvivesuchenvironmentalstressesasheat,cold
The______ofsedimentintherivercausedconcernamongenvironmentalistsandi
The______ofsedimentintherivercausedconcernamongenvironmentalistsandind
Thesupplyoffreshwatercontinuestobea______formostenvironmentalistssinc
Managerswhothinkthatstrongenvironmentalperformancewill(i)______theircom
随机试题
[originaltext]W:IforgottotellyouthatFredcalledlastnighttoborrowyou
不需要联动自动消防设备的保护对象宜采用的自动报警系统是()A.区域报警系统
由下列哪一种土构成的土坡进行稳定分析时一般采用条分法?A.粗砂土 B.碎石土
上述药物中,在完带汤中有燥湿运脾作用的是A.白术B.苍术C.车前子D.山药E.人
共用题干 GiantStructuresItisanimpossibl
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性: A.如
城市轨道交通归纳起来主要可以从()方面进行分类。A.运营范围 B.运输能
货物投标报价表的内容应包括()。A、各种税费B、人工费C、保险费D、所需货
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
根据《征管法》的规定,设立下列主体应当办理税务登记的有()。A.甲政府新设立
最新回复
(
0
)