网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
名词解释题
Sperm capacitation
参考答案
参考解析
解析：
暂无解析
更多 “名词解释题Sperm capacitation” 相关考题
考题
( ) is torn by the women’s first sexual intercourse or othercauses like injuries or some kind of vigorous physical activities. ()
A、wombB、hymenC、labiaD、sperm
考题
Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Channel Dolphin and Wildlife Foundation (SDWF) has been studying a group of up to 120 bottle-nose dolphins in the River Shannon using vocalisations collected on a computer in a cow shed near the River Shannon.As part of a research project, student Ronan Hickey digitised and analysed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated them into six fundamental whistle types and 32 different categories. Of the categories, he found most were used by both sets of dolphins—but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them with behaviour like foraging, resting, socialising and the communications of groups with calves," project leader Simon Berrow said. "Essentially we are building up what is like a dictionary of words they use or sounds they make. "Berrow, a marine biologist, said the dolphins' clicks are used to find their way around and locate prey. The whistles are communications. "They do a whole range of other sounds like barks, groans and a kind of gunshot. " He said. "The gunshot is an intense pulse of sound. Sperm whales use it to stun their prey. ""When I first heard it I was surprised as I thought sperm whales were the only species who used it. We can speculate the dolphins are using it for the same reason as the sperm whales. " Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been resident there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25,000 tourists every year take special sightseeing tours on local boats to visit them.The difference in eating habits between the bottle-nose dolphins and the sperm whales interested the SDWF scientists.A．RightB．WrongC．Not mentioned
考题
共用题干
The Greatest Mystery of WhalesThe whale is a warm一blooded,air-breathing animal,giving birth to its young alive,sucking them一and, like all mammals,originated on land. There are many________________(51)of this. Its front flippers（鳍状肢）, used for steering and stability,are traces of feet.Immense strength is________________(52)into the great body of the big whales,and in fact most of a whale's body is one gigantic muscle.The blue whale's pulling strength has been estimated________________(53) 400 horsepower. One specimen was reported to have towed（拖）a whaling vessel for seven hours at the _______________ (54)of eight knot（节）.An angry whale will________________(55).A famous example of this was the fate of Whaler Essex, ________________(56)was sunk off the coast of South America early in the last century. More recently,steel ships have ___________( 57 ) their plates buckled（使弯曲）in the same way. Sperm whales（抹香鲸）were known to seize the old-time whaleboats in their jaws and crush them.The greatest________________(58)of whales is their diving ability.The sperm whale dives to the bottom foi his________________(59)food,the octopus（章鱼）.In that search he is known to go as far down as 3 , 200 feet, where the________________(60)is 1,400 pounds,to a square inch.Doing so he will________________(61)underwa-ter as long as one hour. Two special skills are involved in this storing up enough________________(62)(allwhales are air-breathed)and tolerating the great change in pressure.Just how he does it scientists have nol_______________ (63).It is believed that some of the oxygen is stored in a special________________(64)of blood vessels,rather than just held in the lungs.And it is believed that a special kind of oil in his head is some sort of a compensating mechanism that________________(65)adjusts the internal pressure of his body.But since you can't bring a live whale into the laboratory for study,no one knows just how these things work._________(63)A:witnessedB:determinedC:appliedD:calculated
考题
共用题干
The Greatest Mystery of WhalesThe whale is a warm-blooded,air-breathing animal,giving birth to its young alive,sucking them-and, like all mammals,originated on land.There are many______(51)of this.Its front flippers（鳍状肢）, used for steering and stability,are traces of feet.Immense strength is______(52)into the great body of the big whales,and in fact most of a whale's body is one gigantic muscle.The blue whale's pulling strength has been estimated______(53) 400 horsepower.One specimen was reported to have towed（拖）a whaling vessel for seven hours at the ______(54)of eight knot（节）.An angry whale will______(55).A famous example of this was the fate of Whaler Essex, ______(56)was sunk off the coast of South America early in the last century.More recently,steel ships have______( 57 ) their plates buckled（使弯曲）in the same way.Sperm whales（抹香鲸）were known to seize the old-time whaleboats in their jaws and crush them.The greatest______(58)of whales is their diving ability.The sperm whale dives to the bottom for his______( 59 ) food , the octopus（章鱼）.In that search he is known to go as far down as 3 , 200 feet, where the______(60)is 1,400 pounds to a square inch.Doing so he will______(61) underwater as long as one hour.Two special skills are involved in this storing up enough______(62) (all whales are air-breathed)and tolerating thern great change in pressure.Just how he does it scientists have not______(63).It is believed that some of the oxygen is stored in a special ______(64)of blood vessels,rather than just held in the lungs.And it is believed that a special kind of oi1 in his head is some sort of a compensating mechanism that______(65)adjusts the internal pressure of his body.But since you can't bring a live whale into the laboratory for study,no one knows just how these things work.53._________A:at B:in C:of D:with
考题
共用题干
That scientists have cloned a sheep sends academics and the public into a panic at the prospect that humans might be next. That's an understandable reaction.(46)___________,so it's not unreasonable to be concerned that it might threaten human society and dignity.Yet much of the ethical oppo-- sition seems also to grow out of an unthinking disgust. And that makes it hard for even trained scientists and ethicists to see the matter clearly.While human cloning might not offer great benefits to humarnty,no one has yet made a persuasive case that it would do any real harm,either.(47)_______That would surely be true if a cloned individual were treated as a lesser being, with fewer rights or lower stature.But why suppose that cloned persons wouldn't share the same rights and dignity as the rest of us?A leading ethicist has suggested that cloning would violate the "right to genetic identity".(48)________It makes perfect sense to say that adult persons have a right not to be cloned without their voluntary,informed consent. But if such consent is given,whose "right"to genetic identity would be violated?So who will likely take advantage of cloning?Perhaps a grieving couple whose child is dying. (49)________But a cloned child born to such dubious parents stands no greater or lesser chance of being loved,or rejected,or warped than a child normally conceived.Infertile couples are also likely to seek out cloning. That such couples have other options(in vitro fertilization or adoption)is not an argument for denying them the right to clone.Or consider an example raised by Judge Richard Posner:a couple in which the husband has some tragic genetic defect. Currently,if this couple wants a genetically related child,(50)________They can reproduce naturally and risk passing on the disease to the child.They can go to a sperm bank and take a chance on unknown genes.They can try in vitro fertilization and dispose of any afflicted embryo though that might be objectionable,too.Or they can get a male relative of the father to donate sperm,if such a relative exists.This is one case where even people unnerved by cloning might see it as not the worst option.Even if human cloning offers no obvious benefits to humanity,why ban it?In a democratic society we don't usually pass laws outlawing something before there is actual or probable evidence of harm.Most important,human cloning should be governed by the same laws that now protect human rights.A world not safe for cloned humans would be a world not safe for the rest of us._______（49）A:they have four not altogether pleasant options.B:This might seem psychologically twisted.C:Theologians contend that to clone a human would violate human dignity.D:Parents might clone a child to have"spare parts"in case the original child needs an organ transplant.E:Cloning is a radical challenge to the most fundamental laws of biology.F: Where did he come up with such a right?
考题
共用题干
Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Shannon Dolphin and Wildlife Foundation(SDWF)has been studying a group of up to 120 bottle- nose dolphins in the River Shannon using vocalizations（发声）collected on a computer in a cow shed near the River Shannon.As part of a research project,student Ronan Hickey digitized and analyzed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated theni into six fundamental whistle types and 32 different categories.Of the categories,he found most were used by both sets of dol-phins一but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them withbehavior like foraging（觅食）,resting, socializing and the communications of grown.ups with calves (幼 仔）,"project leader Simon Berrow said.“Essentially we are building up what is like a dictionary of wordsthey use or sounds they mnake."Berrow,a marine biologist,said the dolphins'clicks are used to find their way around and locate prey.The whistles are communications."They do a whole range 0f other sounds like barks．groans and a kind of gunshot," he said. "The gunshot is an intense pulse（脉冲）of sound. Sperm whales use it to stun（击昏）their prey.”"When I first heard it I was surprised as I thought sperm whales were the onlyh species who used it. Wecan speculate the dolphins are using it for the same reason as the sperm whales,"Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been residents there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25.000 tourists every year take special sightseeing tours on local boats to visit them.As early as the 6th century,Irish fishermen started raising dolphins in the Shannon estuary.A:RightB:WrongC:Not mentioned
考题
共用题干
Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Shannon Dolphin and Wildlife Foundation(SDWF)has been studying a group of up to 120 bottle- nose dolphins in the River Shannon using vocalizations（发声）collected on a computer in a cow shed near the River Shannon.As part of a research project,student Ronan Hickey digitized and analyzed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated theni into six fundamental whistle types and 32 different categories.Of the categories,he found most were used by both sets of dol-phins一but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them withbehavior like foraging（觅食）,resting, socializing and the communications of grown.ups with calves (幼 仔）,"project leader Simon Berrow said.“Essentially we are building up what is like a dictionary of wordsthey use or sounds they mnake."Berrow,a marine biologist,said the dolphins'clicks are used to find their way around and locate prey.The whistles are communications."They do a whole range 0f other sounds like barks．groans and a kind of gunshot," he said. "The gunshot is an intense pulse（脉冲）of sound. Sperm whales use it to stun（击昏）their prey.”"When I first heard it I was surprised as I thought sperm whales were the onlyh species who used it. Wecan speculate the dolphins are using it for the same reason as the sperm whales,"Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been residents there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25.000 tourists every year take special sightseeing tours on local boats to visit them.Irish dolphins attract tourists and over 25,000 people come to see them every year.A:RightB:WrongC:Not mentioned
考题
共用题干
Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Shannon Dolphin and Wildlife Foundation(SDWF)has been studying a group of up to 120 bottle- nose dolphins in the River Shannon using vocalizations（发声）collected on a computer in a cow shed near the River Shannon.As part of a research project,student Ronan Hickey digitized and analyzed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated theni into six fundamental whistle types and 32 different categories.Of the categories,he found most were used by both sets of dol-phins一but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them withbehavior like foraging（觅食）,resting, socializing and the communications of grown.ups with calves (幼 仔）,"project leader Simon Berrow said.“Essentially we are building up what is like a dictionary of wordsthey use or sounds they mnake."Berrow,a marine biologist,said the dolphins'clicks are used to find their way around and locate prey.The whistles are communications."They do a whole range 0f other sounds like barks．groans and a kind of gunshot," he said. "The gunshot is an intense pulse（脉冲）of sound. Sperm whales use it to stun（击昏）their prey.”"When I first heard it I was surprised as I thought sperm whales were the onlyh species who used it. Wecan speculate the dolphins are using it for the same reason as the sperm whales,"Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been residents there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25.000 tourists every year take special sightseeing tours on local boats to visit them.The difference in eating habits between the bottle-nose dolphins arid the sperm wha1c, intcrcotcd the SDWFscientists.A:RightB:WrongC:Not mentioned
考题
单选题The sperm-separation technique is based on the fact that the chromosomes responsible for babies’ sex _____.A
are of different shapesB
are of different sizesC
can be identifiedD
can be reproduced
考题
单选题When MiShel gave birth to her first girl, the new sperm-separation technique _____.A
had already been well-developedB
had not been declared successfulC
was available to those who wanted itD
had been widely accepted in the medical world
考题
名词解释题Capacitation
热门标签
最新试卷
