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提问人:网友sun1735 发布时间:2022-01-07
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A Messenger from the PastHis people said good-bye and watched him walk off toward the moun

A Messenger from the Past

His people said good-bye and watched him walk off toward the mountains. They had little reason to fear for his safety: the man was well dressed in insulated clothing and equipped with tools needed to survive the Alpine climate. However, as weeks passed without his return, they must have grown worried, then anxious, and finally resigned, After many years everyone who knew him had died, and a note even a memory of the man remained.

Then, on an improbably distant day, he came down from the mountain. Things had changed a bit: it wasn't the Bronze Age anymore, and he was a celebrity.

When a melting glacier released its hold on a 4,000-year-old corpse in September, it was quite rightly called one of the most important archeological finds of the century. Discovered by a German couple hiking at 10,500 feet in the Italian Tyrol near the Austrian border, the partially freeze-dried body still wore remnants of leather garments and boots that had been stuffed with straw for insulation. The hikers alerted scientists from the University of Innsbruck in Austria, whose more complete examination revealed that the man was tattooed on his back and behind his knee. At his side was a bronze ax of a type typical in southern central Europe around 2000 B C. On his expedition--perhaps to hunt or to search for metal ore--he had also carded an all-purpose stone knife, a wooden backpack, a bow and a quiver, a small bag containing a flint lighter and kindling, and an arrow repair kit in a leather pouch.

Such everyday gear gives an unprecedented perspective on life in early Bronze Age Europe. "The most exciting thing is that we genuinely appear to be looking at a man who had some kind of accident in the course of a perfectly ordinary trip," says archeologist Ian Kinnes of the British Museum. "These are not artifacts placed in a grave, but the fellow's own possessions."

Unlike the Egyptians and Mesopotamians of the time, who had more advanced civilizations with cities and central authority, the Ice Man and his countrymen lived in a society built around small, stable villages. He probably spoke in a tongue ancestral to current European languages. Furthermore, though he was a member of a farming culture, he may well have been hunting when he died, to add meat to his family's diet. X-rays of the quiver showed that it contained 14 arrows. While his backpack was empty, careful exploration of the trench where he died revealed remnants of animal skin and bones at the same spot where the pack lay. There was also the remainder of a pile of berries. Clearly the man didn't starve to death.

A The trench provided him so with shelter from the elements, and he also had a braided mat of grass to keep him warm. B If injury or illness caused the Ice Man's death, an autopsy on the 4,000-year-old victim could turn up some clues. C The circumstances of his death may have preserved such evidence, as well as other details of his life. D Freeze-dried by the frigid climate, his inner organs and other soft tissues are much better preserved than those of dried-up Egyptian mummies or the waterlogged Scandinavian "Bog Men" found in recent years.

One concern, voiced by archeologist Colin Renfrew of Cambridge University, is that the hot TV lights that greeted the hunter's return to civilizetion may have damaged these fragile tissues, jeopardizing a chance to recover additional precious genetic information from his chromosomes. If not, Renfrew says, "it may be possible to get very long DNA sequences out of this material. This is far and away the most exciting aspect of the discovery."

For the time being, all biological research has literally 68 been put on ice at the University of Innsbruck while an in ternational team of experts, led by researcher Konrad Spindler, puzzlees out a way to thaw the body without destroying it. As sensational as it so

A.tell the readers a true story about the Ice Man and his family.

B.tell the readers about the cause of the Ice Man's death.

C.provide some information about the life 4,000 years ago.

D.introduce some background to the Ice Man in a vivid way.

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更多“A Messenger from the PastHis people said good-bye and watched him walk off toward the moun”相关的问题
第1题
It can be inferred from the passage that which of the following is dependent on the fertil
ization of an egg?

A.Copying of maternal genes to produce maternal messenger RNA’s

B.Sythesis of proteins called histones

C.Division of a cell into its nucleus and the cytoplasm

D.Determination of the egg cell’s potential for division

E.Generation of all of a cell’s morphogenetic determinants

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第2题
How do GPCRs regulate intracellular cyclic AMP levels?
A.Many?extracellular?signals?acting?via?GPCRs?affect?the?activity?of?the?enzyme?adenylyl?cyclase?and?thus?alter?the?intracellular?concentration?of?the?second?messenger?molecule?cyclic?AMP.

B.Most?commonly,?the?activated?G?protein?α?subunit?switches?on?the?adenylyl?cyclase,?causing?a?dramatic?and?sudden?increase?in?the?synthesis?of?cyclic?AMP?from?ATP.

C.To?help?terminate?the?signal,?a?second?enzyme,?called?cyclic?AMP?phosphodiesterase,?rapidly?converts?cyclic?AMP?to?ordinary?AMP.?Cyclic AMP phosphodiesterase is continuously active inside the cell. Because it eliminates cyclic AMP so quickly, the cytosolic concentration of this second messenger can change rapidly in response to extracellular signals, rising or falling tenfold in a matter of seconds.

D.Cyclic AMP is water-soluble,so it can, in some cases, carry the signal throughout the cell, traveling from the site on the membrane where it is synthesized to interact with proteins located in the cytosol, in the nucleus, or on other organelles. One?way?that?caffeine?acts?as?a?stimulant?is?by?inhibiting?this?phosphodiesterase?in?the?nervous?system,?blocking?cyclic?AMP?degradation?and?thereby?keeping?the?concentration?of?this?second?messenger?high.

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第3题
第一信使(first messenger)

第一信使(first messenger)

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第4题
第一信使(first messenger)

第一信使(first messenger)

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第5题
下面哪项关于Messenger广告描述正确的是()

A、Messenger广告客户可以直接发起聊天

B、Messenger广告可以发布任何产品的销售信息

C、Messenger广告不需要提前重置广告费

D、Messenger广告只能在Messenger软件中出现

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第6题
Ever since Gregor Mendel' s famous experiments with hybrid sweet peas, it has been known t
hat there must be unitary elements within the cells which exert control over inherited characteristics, and for a long time there was considerable speculation about what these were. These elements came to be known as genes, and although they were long treated as hypothetical constructs, a great deal of knowledge about them slowly accumulated. It came to be known, for example, that each gene had to be passed along virtually unchanged from generation to generation; that there must be many thousands of these particles in every human cell, distributed unevenly among the twenty-three pairs of chromosomes; that each gene must occupy a very definite place (locus) on its chromosome; and that each pair of homologous chromosomes had to contain homologous assortments of genes, arranged with few exceptions in precisely the same order on each member of the chromosome pail' s. A wonderfully complex and fruitful system thus emerged about an aspect of the world which no one has ever directly observed. Let us now briefly turn to some of the newly acquired insights which have greatly expanded the already impressive theory of genetics.

Genes are, of course, too small to be seen even by the most powerful electron microscopes, but recent research by geneticists, microbiologists, and biochemists has rapidly advanced our information about their constitution and action. The chemical substance of which the genes and thus the chromosomes are made, is now known to be deoxyribonucleic acid (DNA), a giant molecule containing a double-spiral strand of material which embodies the genetic code. The chromosomes consist of long strands of DNA, which, although it is capable of transmitting vastly complex "code messages", is comprised of combinations of only four primary chemical subunits, or "code letters". This great insight into the structure and functioning of genetic material, which was first proposed by James D. Watson and Francis H. C. Crick in 1953, involves a new description of what genes are like. A gene is simply a specific portion of the double-spiral strand of DNA which consists of a particular combination of the code letters that spell out a particular code word.

Various combinations of the four code letters, forming different code words, provide the biochemical information used in the construction of the different proteins in the cell. Many of these proteins act as enzymes. The enzymes, as has been pointed out above, are the biological catalysts which direct all the chemical or metabolic reactions that are going on continuously in all cells. These metabolic functions are, of course, the basis of all the physical growth and development of any living organism.

The code is embodied in the DNA of the chromosomes and genes, but exactly how does this code deter mine the production of proteins. Obviously, the code must be transmitted to the sites at which the actual work of protein synthesis is carried out. The material which accomplishes this task is ribonucleic acid (RNA, a substance very similar to DNA and complementary to it. From the code site on the linear DNA molecule, which is the gene), RNA, the messenger, carries the code to the cellular particles out into the cytoplasm of the cell, where proteins are manufactured. This messenger RNA provides the pattern, and another type of RNA, transfer RNA, collects from within the cytoplasm the raw materials, the amino acids, from which the proteins are made. With the pattern and the materials, the proteins are formed, one step at a time. These proteins act as enzymes or biological catalysis. They exist in all living organisms and control their growth and function through the control of the chemical transformations involved in metabolism. A very large number of enzymes are present in any living creature, and the absence or malformation of any enzyme can destroy the normal sequence of metab

A.proteins are formed

B.chromosomes are paired

C.enzymes are produced

D.cells multiply

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第7题
【单选题】________, son of Zeus and Maia, was the messenger of Zeus.

A.Hermes

B.Apollo

C.Poseidon

D.Dionysus

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第8题
Zeus sent his messenger Hermes to slay a hundred-eyed giant Argos.
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第9题
Which of the following is a secondary messenger?

A.Na+

B.K+

C.Mg2+

D.Ca2+

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第10题
The messenger rushed into the camp, his face ______ with sweat.A.coversB.coveredC.covering

The messenger rushed into the camp, his face ______ with sweat.

A.covers

B.covered

C.covering

D.was covered

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