首页
登录
职称英语
When we think of animals and plants, we have a pretty good way of dividing th
When we think of animals and plants, we have a pretty good way of dividing th
游客
2024-01-23
52
管理
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. [br] 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)。
转载请注明原文地址:http://tihaiku.com/zcyy/3388676.html
相关试题推荐
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
[originaltext](23)Overtimeanimalshavedevelopedmanywaystostayawayf
[originaltext](23)Overtimeanimalshavedevelopedmanywaystostayawayf
Whenwethinkofanimalsandplants,wehaveaprettygoodwayofdividingth
Whenwethinkofanimalsandplants,wehaveaprettygoodwayofdividingth
Whenwethinkofanimalsandplants,wehaveaprettygoodwayofdividingth
[originaltext]Wildcarrotsprobablyevolvedwiththeotherfloweringplants
随机试题
A、Atrailwaystations.B、Incinemas.C、Atrestaurants.D、Inhotels.D文章提及了开饭时间、房
[originaltext]Continuingoursurveyofthe19thcentury,let’stakealook
下列各句,属于误用否定的是( )。A.一个人即使办事认真,也不可能不犯错误
校对工作中的“对片”是将胶片与()核对。A.校样 B.原稿 C.三校样
中国驻某国大使馆设计 试题要求 1.任务描迷 我国拟在北半球某国修建
发挥作用最慢的利尿药是()。A.氢氯噻嗪 B.呋塞米 C.螺内酯 D.阿
注册会计师在了解及评价被审计单位内部控制后,实施控制测试的范围是( )。A、对财
血吸虫虫卵肉芽肿形成的机制主要是T细胞介异的几型变态反应A.都可以B.Ⅲ型变态反
保险合同成立后,保险人按()的时间开始承担保险责任。A.保险合同签订时 B.
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
最新回复
(
0
)