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提问人:网友wangguoting 发布时间:2022-01-07
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South Koreas stem cell scientists have cloned a dog, smashing another biological barrier a

nd reigniting a fierce ethical debate—while producing a perky, lovable puppy. This immediately renewed calls for a global ban on human reproductive cloning before the technology moves any farther. "Successful cloning of an increasing number of species confirms the general impression that it would be possible to clone any mammalian species, including humans," said Ian Wilmut, a reproductive biologist at the University of Edinburgh who produced the first cloned mammal, Dolly the sheep, from an adult cell nearly a decade ago. Researchers have since cloned cats, goats, cows, mice, pigs, rabbits, horses, deer, mules and gaur, a large wild ox of Southeast Asia. So far, efforts to clone a monkey or another primate with the same techniques have failed. Uncertainties about the health and life span of cloned animals persist; Dolly died prematurely in 2003 after developing cancer and arthritis.

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更多“South Koreas stem cell scientists have cloned a dog, smashing another biological barrier a”相关的问题
第1题
Securities not listed on one of the exchanges trade in the over-the-counter market. In this exchange, dealers “make a market” by _________

A、buying stocks for inventory when investors want to sell.

B、selling stocks from inventory when investors want to buy.

C、doing both of the above.

D、doing neither of the above.

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第2题
The mystery in question is none other than the human embryo cloned a la Dolly. The aim is not to produce people. Through "therapeutic"(治疗的)cloning, scientists would create embryos to harvest stem cells, which may hold the key to treating a wide range of disease. But like most passionate debates, the real issue 一 commercialization 一 sits quietly in the background of the emotional chaos. The debate erupted across the industrially advanced world on January 22nd when Britain became the first European country to legalize the creation of cloned human embryos. Members of the European Parliament almost immediately expressed their shock and condemned the decision. Yet in many ways, the new law is a logical extension of rules dating back over a decade. Since 1990, UK researchers could create and use embryos for limited research purposes, namely to treat infertility and detect birth defects. The new law widens the field of study to include stem cells, which experts say could revolutionize medicine, offering the possibility of transplants to treat scores of illnesses from Parkinson's disease to diabetes (糖尿病).No one has yet applied for a license to perform. such experiments, according to the Human Fertilisation and Embryology Authority, which will carefully screen each request. No other uses of cloning would be allowed and a new law has been promised to explicitly (明确地)ban reproductive cloning.

As expected, the most rigid opposition has come from the Catholic Church, which considers the embryo to be a living person from the moment of conception. Cloning aside, even research involving "spare" embryos (created for infertility treatments but not used. is condemned because it is morally wrong to use a person for the benefit of someone else. At the opposite end of the spectrum (范围)lie the hardcore utilitarians (功利主义)of science and business, who are generally astute (精明的)enough not to announce their politically incorrect views: namely that the embryo isjust another batch of cellular sludge (淤积;淤沉)that can and should be used like any other biological resource in the pursuit of medical research.

1.The purpose of therapeutic cloning is to.()

A.produce people

B.commercialize stem cells

C.treat various diseases

D.clone human embryo in Dolly

2.What triggered the debate across the industrial countries?()

A.The commercialization of cloned human embryos.

B.Legalizing the creation of cloned human embryos in Britain.

C.A theoretical flaw in the experiment of human embryos cloning.

D.The European Parliament's harsh criticism on the UK's decision.

3.In the 1990s the British researchers use embryos basically to.()

A.harvest stem cells

B.reform. the system of medical care

C.treat infertility and detect birth defects

D.study the possibility of organ transplants

4.The Catholic Church argue against human embryos cloning because.()

A.cloning creates spare embryos

B.it considers the embryo to be a living person

C.it may lead to reproductive cloning

D.it's morally wrong to use a person for the benefit of another one

5.The utilitarians of science and business think.()

A.human embryos cloning is a hard choice

B.it's politically incorrect to clone human embryos

C.the embryos should be used like any other biological resource

D.human embryos are important samples in the pursuit of medical research

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第3题
根据下面材料,回答题。

Human Heart Can Make New Cells

Solving a longstanding mystery, scientists have found that the human heart continues to generate new cardiac cells throughout the life span, although the rate of new cell production slows with age.

The finding, published in the April 3 issue of Science, could open a new path for the treatment of heart diseases such as heart failure and heart attack, experts say.

"We find that the beating cells in the heart, cardiomyocytes, are renewed," said lead researcher Dr. Jonas Frisen, a professor of stem cell research at the Karolinska Institute in Stockholm, Sweden.

"It has previously not been known whether we were limited to the cardiomyocytes we are born with or if they could be renewed," he said.

The process of renewing these ceils changes over time, Frisen added. In a 20-year-old, about 1 percent of cardiomyocytes are exchanged each year, but the turnover rate decreases with age to only 0.45 percent by age 75.

"If we can understand how the generation of new cardiomyocytes is regulated, it may be potentially possible to develop pharmaceuticals that promote this process to stimulate regeneration after, for example, a heart attack," Frisen said.

That could lead to treatment that helps restore damaged hearts. "A lot of people suffer from chronic heart failure," noted co-author Dr.Ratan Bhardwaj, also from the Karolinska Institute.

"Chronic heart failure arises from heart cells dying," he said.

With this finding, scientists are "opening the door to potential therapies to having ourselves heal ourselves," Bhardwaj said. "Maybe one could devise a pharmaceutical agent that would make heart cells make new and more cells to overcome the problem they are facing."

But barriers remain. According to Bhardwaj, scientists do not yet know how to increase heart cell production to a rate that would replace cells faster than they are dying off, especially in older patients with heart failure. In addition, the number of new cells the heart produces was estimated using healthy hearts--whether the rate of cell turnover in diseased hearts is the same remains unknown.

The human heart stops producing cardiac cells____________. 查看材料

A.when a person is born

B.when a person becomes old

C.when a person gets sick

D.when a person dies

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第4题
Though _____ experience, she eventually got the chance of working in Dell Company.

[    ]

A. lack of

B. lacked

C. lack in

D. lacking

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第5题
Which of the following adjectives can best describe American economy between the 1840s and the 1860s?

A.Diversified.

B.Stable.

C.Thrilling.

D.Prosperous.

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第6题
There are ______ words by combining "white" ,"up" ,"wash" mutually.A.1B.2C.3D.4
There are ______ words by combining "white" ,"up" ,"wash" mutually.

A.1

B.2

C.3

D.4

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