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
Despite the fact that today virus are known to cause cancer in animals and in plants, there exists a great reluctance to accept
Despite the fact that today virus are known to cause cancer in animals and in plants, there exists a great reluctance to accept
admin
2014-01-13
49
问题
Despite the fact that today virus are known to cause cancer in animals and in plants, there exists a great reluctance to accept viruses as being of importance in human cancer. Basic biological phenomena generally do not differ strikingly as one goes from one species to another. It should be recognized that cancer is a biological problem and not a problem that is unique for man. Cancer originates when a normal cell suddenly becomes a cancer which multiplies widely and without apparent restraint. Cancer may originate in many different kinds of cell, but the cancer cell usually continues to carry certain traits of the cell of origin. The transformation of a normal cell into a cancer cell may have more than one kind of cause, but there is good reason to consider the relationships that exist between viruses and cancer.
Since there is no evidence that human cancer, as generally experienced, is infectious, many persons believe that because viruses are infectious agents they cannot possibly be of importance in human cancer. However, viruses can mutate and examples are known in which a virus that never kills its host can mutate to form a new strain of virus that always kills its host. It does not seem unreasonable to assume that an innocuous latent virus might mutate to form a strain that causes cancer. Certainly the experimental evidence now available is consistent with the idea that viruses as we know them today could be the causative agents of most, if not all cancer, including cancer in man.
According to the passage, which is true?
选项
A、The transformation of a cell into a cancer has just one reason.
B、There is no relationship between viruses and cancers.
C、Viruses can mutate in some cases.
D、Viruses are not contagious.
答案
C
解析
根据文章第二段第二句“viruses can mutate and examples are known in which a virus that never kills its host can mutate to form a new strain of virus that always kills its host.”可知,病毒是可以变异的,一个不能导致受体死亡的病毒会变异成一种新式病毒,这种病毒常常会导致受体的死亡。所以C正确。据此判断,本题选C。
转载请注明原文地址:https://kaotiyun.com/show/eIQO777K
0
考博英语
相关试题推荐
Forlaymenethnologyisprobablythemostinterestingofthebiologicalsciencesfortheveryreasonthatitconcernsanimalsin
Forlaymenethnologyisprobablythemostinterestingofthebiologicalsciencesfortheveryreasonthatitconcernsanimalsin
1.Thesinglelongastockfigureinstories,songsandpersonalads.wastraditionallysomeoneatthemarginsofsociety:afigu
1.Thesinglelongastockfigureinstories,songsandpersonalads.wastraditionallysomeoneatthemarginsofsociety:afigu
Shouldwecareifover150knownspeciesofanimalshave【1】fromtheearthinthelastfiftyyears?Shouldwebeconcernedthatt
Shouldwecareifover150knownspeciesofanimalshave【1】fromtheearthinthelastfiftyyears?Shouldwebeconcernedthatt
Shouldwecareifover150knownspeciesofanimalshave【1】fromtheearthinthelastfiftyyears?Shouldwebeconcernedthatt
Shouldwecareifover150knownspeciesofanimalshave【1】fromtheearthinthelastfiftyyears?Shouldwebeconcernedthatt
Shouldwecareifover150knownspeciesofanimalshave【1】fromtheearthinthelastfiftyyears?Shouldwebeconcernedthatt
Shouldwecareifover150knownspeciesofanimalshave【1】fromtheearthinthelastfiftyyears?Shouldwebeconcernedthatt
随机试题
患者,男,31岁。发现高血压1年,发热、咽痛2天,肉眼血尿1天。查体:血压160/100mmHg,咽红,扁桃体Ⅱ度肿大,双下肢无水肿。化验:尿蛋白2.5g/d,尿沉渣镜检红细胞满视野,血肌酐210gmol/L,尿比重1.018,肝功能正常,乙肝两对半阴性,
导致肾素分泌增加的常见病理或生理原因有
巴戟天薄壁组织中可见
某村有年满18周岁以上村民500人,其中有100名村民联名提出罢免村委会主任。500名村民都参加了投票,经村民会议投票,下列选项中哪个是罢免被通过的最低人数要求?()
仓储合同中,保管人的义务是()。
关于投资性房地产后续计量模式的转换,下列表述中正确的有()。
已知1mol白磷(s)转化成1mol红磷,放出18.39kJ热量,又知:4P(白磷,s)+5O2(g)=2P2O5(s);△H1,4P(红磷,s)+5O2(g)=2P2O5(s);△H2,则△H1和△H2的关系正确的是()。
已知(114)6表示六进制的114,则其用八进制可表示为(15)。
WASHINGTON—Nearly40millionchildrenindevelopingcountriesstandtoloseoneorbothparentsduetoAIDS(艾滋病)overthenext
PubLictransit.InNorthAmerica,publictransportationhasbeenthemajorcasualtyofthecommitmenttotheautomobile.Rider
最新回复
(
0
)