题干

2012年诺贝尔生理学或医学奖与细胞核重新编程相关.该技术是将成年体细胞重新诱导回早期干细胞状态,以用于形成各种类型的细胞,使细胞内的基因表达由一种类型变成另一种类型.通过这一技术,可在同一个体上将较容易获得的细胞(如皮肤细胞)类型转变成另一种较难获得的细胞类型(如脑细胞)下列叙述不正确的是(    )

A:干细胞保留着细胞分裂和细胞分化能力

B:成年体细胞重新诱导回早期干细胞状态的过程中分化程度由高变低

C:通过这一技术若能实现将皮肤细胞形成各种类型的细胞,则能体现细胞的全能性

D:这一技术的实现将能避免异体移植产生的排异反应

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答案(点此获取答案解析)

C

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    Typing with one hand when the other one is occupied can be a real pain, so imagine having to type with just one foot. It's got to be a nightmare, but 21-year-old Hu Huiyuan from China's Anhui Province is using her only functional foot to write not just a few sentences, but an entire fiction novel!

    Born prematurely(过早地), Hu was diagnosed with cerebral palsy(脑瘫) when she was only 10 months old. This left her permanently paralyzed—the only parts of her body she can move are her head and left foot. As she grew older, she learned how to perform everyday tasks using her foot.

    Despite not having received formal education, Hu is surprisingly well-spoken. Over the years, with the help of her mother, she taught herself to read and write. “I'm not a genius, but I'm very focused,” she said, modestly. “When I watched TV in my childhood, I often learned words on the screen.”

    “When I was teaching her how to speak, I had to repeat every single word a thousand times before she got it, ”Hu's mother said. “But once she mastered the word. I felt satisfied.”

    With time going by, Hu's language got so proficient that she set out to write a story about the pursuit of dreams and love. She's doing this by typing out every single word on her computer using only one foot.

    In spite of all these setbacks, Hu is able to type 20 to 30 words a minute. She has already written six chapters—that's 60,000 words—and says she only has two more chapters to go before the novel is complete.