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
18
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
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. [br] It may be inferred from the passage that, in contrast to their present view, microbiologists once believed that
选项
A、only a single feature of endospore biology was responsible for their success
B、potentially, a canning process could be developed that was capable of destroying all endospores
C、ultraviolet radiation was a possible means of destroying microorganisms that practice cellular dormancy
D、cellular mitosis was the root cause of the resilience of the microorganisms under discussion
E、only single-celled organisms, like those of fungal spores, could practice cellular dormancy
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3352730.html
相关试题推荐
So-calledenvironmentalistshavearguedthattheproposedGoldenLakeDevelopmen
Theproblemthatenvironmentaleconomicsaimstoremedyisthefollowing:people
TheEnvironmentalProtectionAgencymustrespondtothehazardtochildren’she
Environmentalscientist:Itistruethatoverthepasttenyears,therehasbeen
Tomanyenvironmentalists,theextinctionofplants—accompaniedbytheincreasin
Inthefaceofwidespreadconcernaboutenvironmentalwaste,compactdiscmanufa
Lessthan400SumatranrhinossurviveontheMalaypeninsulaandontheislands
Innosense______,thebillionaire’sfortunessurvivedyetanotherfinancialp
Innosense______,thebillionaire’sfortunessurvivedyetanotherfinancialpan
Howanyfetussurvivesgestationhasbaffledscientistsfordecades:theembryo’
随机试题
()拍照点()物品存放处[br]()失物招领处()问讯处H/A
WhichofthefollowingisNOTamongthecriteriaofthe100mostpowerfulwomen
Theriver,whichis__________theYangtze
被动地旋转或环转关节的一种手法是( )。A.摇法 B.摆法 C.抖法 D
一侧舌咽神经、迷走神经损害不出现A.同侧软腭上提受限 B.发"啊"时悬雍垂偏向
下列有关工程变更的控制,描述错误的是( )。 A、总监理工程师组织专业监理工
下列不属于要约邀请的是()。A:寄送的价目表 B:拍卖广告 C:招标公告
腰椎间盘突出症局部注射药物治疗的目的不包括A、消肿 B、减轻粘连 C、预防感
痰湿內阻之痞满当选( ) A.保和丸 B.四逆散 C.大黄黄连泻心汤
男,32岁,近2个月上床后近2小时方能入睡,每周3~4次,只能睡眠2~4小时,晨
最新回复
(
0
)