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【单选题】

Most people think of lions as strictly African beasts, but only because they"re been killed off almost everywhere else. Ten thousand years ago lions spanned vast sections of the globe. Now lions hold only a small fraction of their former habitat, and Asiatic lions, a subspecies that split from African lions perhaps 100,000 years ago, hang on to an almost impossibly small slice of their former territory.
India is the proud steward of these 300 or so lions, which live primarily in a 560-square-mile sanctuary (保护区). It took me a year and a half to get a permit to explore the entire Gir Forest—and no time at all to see why these lions became symbols of royalty and greatness. A tiger will hide in the forest unseen, but a lion stands its ground, curious and unafraid lionhearted. Though they told me in subtle ways when I got too close, Gir"s lions allowed me unique glimpses into their lives during my three months in the forest. It"s odd to think that they are threatened by extinction; Gir has as many lions as it can hold—too many, in fact. With territory in short supply, lions move about near the boundary of the forest and even leave it altogether, often clashing with people. That"s one reason India is creating a second sanctuary. There are other pressing reasons, outbreaks of disease or natural disasters. In 1994 a serious disease killed more than a third of Africa"s Serengeti lions—a thousand animals—a fate that could easily happen to Gir"s cats. These lions are especially vulnerable to disease because they descend from as few as a dozen individuals. "If you do a DNA test, Asiatic lions actually look like identical twins," says Stephen O"Brien, a geneticist (基因学家) who has studied them. Yet the ers are hidden, and you wouldn"t suspect them by watching these lords of the forest. The lions display vitality, and no small measure of charm.
Though the gentle intimacy of play vanishes when it"s time to eat, meals in Gir are not necessarily frantic affairs. For a mother and her baby lion sharing a deer, or a young male eating an antelope (羚羊), there"s no need to fight for a cut of the kill. The animals they hunt for food are generally smaller in Gir than those in Africa, and hunting groups tend to be smaller as well. What does the sentence "...meals in Gir are not necessarily frantic affair" mean

A.
The lions do not show intimacy among them any more.
B.
The lions may not need to fight for food.
C.
Food is not readily available in that region.
D.
Meals can be obtained only with great effort.
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参考答案:
举一反三

【单选题】建立自然保护区的目的是______。

A.
保护濒临灭绝的动物
B.
保护生物多样性和各种生态系统
C.
保护具有药用价值的植物资源
D.
保护自然遗迹、发展旅游业

【单选题】src基因是()

A.
转录因子
B.
抑癌基因
C.
两者都是
D.
两者皆非

【单选题】关于植物转基因方法选择,下列说法中不正确的选项是 。

A.
对农杆菌敏感的植物,可以优选农杆菌介导的植物转基因方法
B.
对于原生质体易于制备和培养的植物,可以选择PEG介导直接转化
C.
对于多胚珠植物,可以选用显微注射法
D.
对于转化难度很大,多种方法都无效的植物,可以选用基因枪法进行尝试

【单选题】下列不属于获取目的基因方法的是[ ]

A.
利用DNA连接酶复制目的基因
B.
利用DNA聚合酶复制目的基因
C.
从基因文库中获取目的基因
D.
利用PCR技术扩增目的基因

【单选题】lzcZ'基因指的是()。

A.
β-半乳糖苷酶基因
B.
氨苄西林抗性基因
C.
四环素抗性基因
D.
卡那霉素抗性基因
相关题目:
【单选题】建立自然保护区的目的是______。
A.
保护濒临灭绝的动物
B.
保护生物多样性和各种生态系统
C.
保护具有药用价值的植物资源
D.
保护自然遗迹、发展旅游业
【单选题】src基因是()
A.
转录因子
B.
抑癌基因
C.
两者都是
D.
两者皆非
【单选题】关于植物转基因方法选择,下列说法中不正确的选项是 。
A.
对农杆菌敏感的植物,可以优选农杆菌介导的植物转基因方法
B.
对于原生质体易于制备和培养的植物,可以选择PEG介导直接转化
C.
对于多胚珠植物,可以选用显微注射法
D.
对于转化难度很大,多种方法都无效的植物,可以选用基因枪法进行尝试
【单选题】下列不属于获取目的基因方法的是[ ]
A.
利用DNA连接酶复制目的基因
B.
利用DNA聚合酶复制目的基因
C.
从基因文库中获取目的基因
D.
利用PCR技术扩增目的基因
【单选题】lzcZ'基因指的是()。
A.
β-半乳糖苷酶基因
B.
氨苄西林抗性基因
C.
四环素抗性基因
D.
卡那霉素抗性基因
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