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  3. When we think of animals and plants, we have a pretty good way of dividing them into two distinct groups: one converts sunlight

When we think of animals and plants, we have a pretty good way of dividing them into two distinct groups: one converts sunlight

admin2021-01-06  41
问题    When we think of animals and plants, we have a pretty good way of dividing them into two distinct groups: one converts sunlight into energy and the other has to eat food to make its energy. Well, those dividing lines come crashing down with the discovery of a sea slug (嗨蛞蝓) that’s truly half animal and half plant. It’s pretty incredible how it has managed to hijack the genes of the algae (藻类) on which it feeds.
   The slugs can manufacture chlorophyll, the green pigment (色素) in plants that captures energy from sunlight, and hold these genes within their body. The term kleptoplasty is used to describe the practice of using hijacked genes to create nutrients from sunlight. And so far, this green sea slug is the only known animal that can be truly considered solar-powered, although some animals do exhibit some plant-like behaviors. Many scientists have studied the green sea slugs to confirm that they are actually able to create energy from sunlight.
   In fact, the slugs use the genetic material so well that they pass it on to their future generations. Their babies retain the ability to produce their own chlorophyll, though they can’t generate energy from sunlight until they’ve eaten enough algae to steal the necessary genes, which they can’t yet produce on their own.
   "There’s no way on earth that genes from an alga should work inside an animal will," says Sidney Pierce from the University of South Florida. "And yet here, they do. They allow the animal to rely on sunshine for its nutrition. So if something happens to their food source, they have a way of not starving to death until they find more algae to eat."
   The sea slugs are so good at gathering energy from the sun that they can live up to nine months without having to eat any food. They get all their nutritional needs met by the genes that they’ve hijacked from the algae.
What does Sidney Pierce say about genes from an alga?
选项 A、They are stolen from animals like the sea slug.
B、They can’t function unless exposed to sunlight.
C、They don’t usually function inside animal cells.
D、They can readily be converted to sea slug genes.
答案C
解析 推理判断题。定位句提到了西德尼-皮尔斯的话：在地球上，藻类的基因不可能在动物细胞内奏效，但是在海蛞蝓身上，它们却做到了。由此可见，根据西德尼-皮尔斯的观点，通常情况下，藻类基因是不能在动物细胞内起作用的，故答案为C)。
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