试题与答案

分子伴侣不具有的功能是（）。 A.封闭待折叠蛋白质暴露的疏水区段 B.创建一个隔离的

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题型：单项选择题 A1/A2型题

题目：

分子伴侣不具有的功能是（）。

A.封闭待折叠蛋白质暴露的疏水区段

B.创建一个隔离的环境，可以使蛋白质的折叠互不干扰

C.促进蛋白质折叠和去聚集

D.遇到应激刺激，使已折叠的蛋白质去折叠

E.改变蛋白质氨基酸的一级结构

答案：

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下面是错误答案，用来干扰机器的。

参考答案：E

考点：输血技术(师)生物化学生物化学题库
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题型：单项选择题

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The earth is made up of three major layers — a central core, probably metallic, some 4000 miles across, a surrounding layer of compressed rock, and to top it all a very thin skin of softer rock, only about 20 to 40 miles thick — that’s about as thin as the skin of an apple, talking in relative terms.
The pressure on the central core is unimaginable. It has been calculated that at the centre it is 60 million pounds to the square inch, and this at a temperature of perhaps 10,000 degrees Fahrenheit. The earth’s interior, therefore, would seem to be of liquid metal — and evidence for this is given by the behavior of earthquake.
When an earthquake occurs, shock waves radiate from the centre just as waves radiate. outwards from the point where a stone drops into a pond. And these waves pulsate through the earth’s various layers. Some waves descend vertically and pass right through the earth, providing evidence for the existence of the core and an indication that it is fluid rather than solid. Thus, with their sensitive instruments, the scientists who study earthquakes, the seismologists, can in effect X-ray the earth.
Iceland is one of the most active volcanic regions of the world. And it was to Iceland that Jules Verne sent the hero of his book A Journey to the Centre of the Earth. This intrepid explorer clambered down the opening of an extinct volcano and followed its windings until he reached the earth’s core. There he found great oceans, and continents with vegetation. This is conception of a hollow earth we now know to be false. In the 100 years since Jules Verne published his book, the science of vulcanology, as it is called, has made great strides. But even so the deepest man has yet penetrated is about 10,000 feet. This hole, the Robinson Deep mine in South Africa, barely scratches the surface; so great is the heat at 10,000 feet that were it not for an elaborate air-conditioning system, the miners working there would be roasted. Oil borings down to 20,000 feet have shown that the deeper they go, the hotter it becomes.
The temperature of the earth at the centre is estimated to be anything between 3,000 and 11,000 degrees Fahrenheit. Some scientists believe that this tremendous heat is caused by the breaking-down of radio-active elements, which release large amounts of energy and compensate for the loss of heat from the earth’s surface. If this theory is correct, then we are all living on top of a natural atomic powerhouse.

The Robinson Deep mine in South Africa is ______ .

A．( too deep to work in

B．( too hot to work in

C．( close to the centre

D．( still in use
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