题干

下列对动物核移植技术的描述不正确的是(   )

A:哺乳动物核移植包括胚胎细胞核移植和体细胞核移植,动物体细胞核移植的难度明显高于胚胎核移植

B:体细胞核移植的过程中可通过显微操作去核法去除卵母细胞中的核

C:体细胞核移植过程中通常采用MⅡ期卵母细胞作为受体细胞

D:通过体细胞核移植方法生产的克隆动物是对供体细胞动物进行了100%的复制

上一题 下一题 0.0难度 选择题 更新时间:2018-02-08 03:26:15

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D

同类题1

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    TV Ears patented (有专利权的) technology includes a revolutionary noise reduction ear tip, not used in any other commercially available headset. This tip reduces outside noise so that television dialogue is clear and understandable. Get the technology that has proven to help the most demanding customers. That's why TV Ears has earned the trust and confidence of audiologists (听觉学家) nationwide as well as world-famous doctors.

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同类题5

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    People are being lured(引诱) onto Facebook with the promise of a fun, free service without realizing they're paying for it by giving up large amounts of personal information. Facebook then attempts to make money by selling their data to advertisers that want to send targeted messages.

    Most Facebook users don't realize this is happening. Even if they know what the company is up to, they still have no idea what they're paying for Facebook because people don't really know what their personal data is worth.

    The biggest problem, however, is that the company keeps changing the rules. Early on, you keep everything private. That was the great thing about Facebook—you could create your own little private network. Last year, the company changed its privacy rules so that many things—your city, your photo, your friends' names—were set, by default(默认) to be shared with everyone on the Internet.

    According to Facebook's vice-president Elliot Schrage, the company is simply making changes to improve its service, and if people don't share information, they have a “less satisfying experience”.

    Some critics think this is more about Facebook looking to make more money. Its original business model, which involved selling ads and putting them at the side of the page, totally failed. Who wants to look at ads when they're online connecting with their friends?

    The privacy issue has already landed Facebook in hot water in Washington. In April, Senator(议员) Charles Schumer called on Facebook to change its privacy policy. He also urged the Federal Trade Commission to set principles for social-networking sites. “I think the senator rightly communicated that we had not been clear about what the new products were and how people could choose to use them or not to use them,” Schrage admits.

    I suspect that whatever Facebook has done so far to invade our privacy is only the beginning, which is why I'm considering deactivating (撤销) my account. Facebook is a handy site, but I'm upset by the idea that my information is in the hands of people I don't know. That's too high a price to pay.