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
专升本
Since the early 1980s, scientists have revealed some 40 human genes involved in cancer. These genes are essential for normal gro
Since the early 1980s, scientists have revealed some 40 human genes involved in cancer. These genes are essential for normal gro
admin
2012-12-31
56
问题
Since the early 1980s, scientists have revealed some 40 human genes involved in cancer. These genes are essential for normal growth, but can be subverted to cause a tumor.
Dr. Jorge Yunis of the University of Minnesota Medical School in Minneapolis has found that 70 percent of oncogenes, or cancer-causing genes, are located near inherited weak points on chromosomes(染色体). Varying from individual to individual, vulnerable to chemical carcinogens(致癌剂), X rays and other cancer-inducing agents.
"If a chromosome snaps apart in the immediate vicinity of an oncogene," says Yunis, "normal genetic control mechanisms could break down and the stage would be set for the formation of cancer." Younis has shown that such a sequence occurs at the beginning of numerous leukemias (白血病), lymphomas(淋巴瘤) and some tumors of the lung, colon(结肠) and breast.
Yunis and other investigators have found that petroleum-based products--notably pesticides and insecticides-damage specific sites on at least two of the 23 pairs of human chromosomes that carry genetic information. Similarly, tobacco smoke tends to attack a part of another chromosome.
From paragraph 1, we know that some 40 genes involving in cancer are ______. ( )
选项
A、harmful to the human body
B、necessary to the human body
C、the elements that form cancer
D、useless to the human body
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/TteC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Cananimalsbemadetoworkforus?Somescientiststhinkthatonedayanimalsmaybetrainedtodoanumberofsimplejobsthat
Pickouttheappropriateexpressionsfromtheeightchoicesbelowandcompletethefollowingdialogsbyblackeningthecorrespon
Mostdictionarieswilltellyouanumberof【21】aboutalanguage.Therearethreethingsinparticularthat【22】important.Theset
Mostdictionarieswilltellyouanumberof【21】aboutalanguage.Therearethreethingsinparticularthat【22】important.Theset
Forthispart,youaresupposedtowriteacompositionof100-120wordsbasedonthefollowingsituation.Remembertowriteitc
Ahundredyearsago,thegamewenowcallfootballdidnotexist.Americanfootballstartedduringagamebetweentwocolleges.
Mr.AndMrs.SmithhadalwaysspenttheirsummerholidaysinNewJerseyinthepast,stayinginasmallinnatthefootofahil
Thehumorousstorymaybetoldtogreatlength,andmaywanderaroundasmuchasitpleases,andarrivenowhereinparticular;b
Normallyastudentmustattendacertainnumberofcoursesinordertograduate,andeachcoursewhichheattendsgiveshimacr
Heis______ahorse.
随机试题
A.呕吐物为隔餐食物,带腐臭味B.呕吐物为黄绿色,带粪臭味C.呕吐物为大量黏液及食物D.呕吐物为血液E.吐出胃内容物后仍干呕不止急性胆囊炎的临床表现是
3,3’-二羟基黄酮与7,4’-二羟基黄酮的分离可用
根据《药品经营质量管理规范》,关于药品批发企业药品收货与验收的说法,错误的是
小钱护士给大学生讲解女性保健常识。
按规定不属于造价工程师执业范围的是()。
凯恩斯学派认为货币政策的传导变量是()。
“竖大拇指”在北美一般被认为是“做得好”的意思,但在澳大利亚就成了无理的肢体语言;吃面条时发出声音,日本人和韩国人觉得很正常,但英国人可能感到不舒服。这类现象表明()。
Thereareagreatmanycareersinwhichtheincreasingemphasisisonspecialization.Youfindthesecareersinengineering,in
在面向对象的系统中,系统责任的良好分配原则是(7)。软件配置项是软件配置管理的对象,即软件工程过程中产生的(8)。软件测试计划开始于需求分析阶段,完成于(9)阶段。
Wedeveloptradewiththatcompanyforourshared________.
最新回复
(
0
)