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The rats fed unrestricted diets do NOT
A．have one preventing-aging protein increased.
B．have their cell death increased or doubled.
C．have their DNA fragmentation doubled.
D．have the levels of proteins increased.
答案
更多“The rats fed unrestricted diets do NOTA．have one preventing-aging protein increased.B．have”相关的问题
第1题
The rats fed unrestricted diets do NOT ______
A．have one preventing-aging protein increased
B．have their cell death increased or doubled
C．have their DNA fragmentation doubled
D．have the levels of proteins increased
第2题
By mating in successive generations only those animals that failed to develop hypertension from salt ingestion, a resistant strain (the" R" strain) has been evolved in which consumption of large quantities of salt fails to influence the blood pressure significantly. In contrast, by mating only animals that quickly develop hypertension from salt, a sensitive strain ("S" strain) has also been developed.
The availability of these two strains permits investigations not heretofore possible. They provide a plausible laboratory model on which to investigate some clinical aspects of the human proto - types of hypertension. More important, there might be the possibility of developing methods by which genetic susceptibility of human beings to high blood pressure can be defined without waiting for its appearance.
Which statement relates the main idea of this passage？
A．When salt is added to their diets, rats and men react in much the same way.
B．The near future will see a cure for high blood pressure.
C．Modem research has shown that high blood pressure is a result of salt in the diet.
D．A tendency toward high blood pressure may be a hereditary factor.
第3题
Controlling Robots with the Mind
Belle, our tiny monkey, was seated in her special chair inside a chamber at our Duke University lab. Her right hand grasped a joystick (操纵杆) as she watched a horizontal series of lights on a display panel. She knew that if a light suddenly shone and she moved the joystick left or right to correspond to its position, she would be sent a drop of fruit juice into her mouth.
Belle wore a cap glued to her head. Under it were four plastic connectors, which fed arrays of microwires - each wire finer than the finest sewing thread- into different regions of Belle's motor cortex (脑皮层), the brain tissue that plans movements and sends instructions. Each of the 100 microwires lay beside a single motor neuron (神经元). When a neuron produced an electrical discharge, the adjacent microwire would capture the currant and send it up through a small wiring bundle that ran from Belle's cap to a box of electronics on a table next to the booth. The box, in turn, was linked to two computers, one next door and the other half a country away.
After months of hard work, we were about to test the idea that we could reliably translate the raw electrical activity in a living being's brain - Belle's mere thoughts - into signals that could direct the actions of a robot. We had assembled a multijointed robot arm in this room, away from Belle's view, which she would control for the first time. As soon as Belle's brain sensed a lit spot on the panel, electronics in the box running two real-time mathematical models would rapidly analyze the tiny action potentials produced by her brain cells. Our lab computer would convert the electrical patterns into instructions that would direct the robot arm. Six hundred miles north, in Cambridge, Mass, a different computer would produce the same actions in another robot arm built by Mandayam A. Srinivasan. If we had done everything correctly, the two robot arms would behave as Belle's arm did, at exactly the same time.
Finally the moment came. We randomly switched on lights in front of Belle, and she immediately moved her joystick back and forth to correspond to them. Our robot arm moved similarly to Belle's real arm. So did Srinivasan's. Belle and the robots moved in synchrony (同步), like dancers choreographed (设计舞蹈动作) by the electrical impulses sparking in Belle's mind.
In the two years since that day, our labs and several others have advanced neuroscience, computer science and microelectronics to create ways for rats, monkeys and eventually humans to control mechanical and electronic machines purely by "thinking through," or imagining the motions. Our immediate goal is to help a person who has been unable to move by a neurological (神经的) disorder or spinal cord (脊髓) injury, but whose motor cortex is spared, to operate a wheelchair or a robotic limb.
Belle would be fed some fruit juice if she
A．grasped the joystick.
B．moved the joystick to the side of the light.
C．sat quietly in a special chair.
D．watched lights on a display panel.
第4题
Controlling Robots with the Mind
Belle, our tiny monkey, was seated in her special chair inside a chamber at our Duke University lab. Her right hand grasped a joystick (操纵杆) as she watched a horizontal series of lights on a display panel. She knew that if a light suddenly shone and she moved the joystick left or right to correspond to its position, she would be sent a drop of fruit juice into her mouth.
Belle wore a cap glued to her head. Under it were four plastic connectors, which fed arrays of microwires-each wire finer than the finest sewing thread- into different regions of Belle's motor cortex (脑皮层), tile brain tissue that plans movements and sends instructions. Each of the 100 microwires lay beside a single motor neuron (神经元). When a neuron produced an electrical discharge, the adjacent microwire would capture the current and send it up through a small wiring bundle that ran from Belle's cap to a box of electronics on a table next to the booth. The box, in turn, was linked to two computers, one next door and the other half a country away.
After months of hard work, we were about to test the idea that we could reliably
translate the raw electrical activity in a living being's brain-Belle's mere thoughts-into signals that could direct the actions of a robot. We had assembled a multi-jointed robot arm in this room, away from Belle's view, which she would control for the first time. As soon as Belle's brain sensed a lit spot on the panel, electronics in the box running two real-time mathematical models would rapidly analyze the tiny action potentials produced by her brain cells. Our lab computer would convert the electrical patterns into instructions that would direct the robot arm. Six hundred miles north, in Cambridge, Mass, a different computer would produce the same actions in another robot arm built by Mandayam A. Srinivasan. If we had done everything correctly, the two robot arms would behave as Belle's arm did, at exactly the same time.
Finally the moment came. We randomly switched on lights in front of Belle, and she immediately moved her joystick back and forth to correspond to them. Our robot arm moved similarly to Belle's real arm. So did Sriniwlsan's. Belle and the robots moved in synchrony (同步), like dancers choreographed (设计舞蹈动作) by the electrical impulses sparking in Belle's mind.
In the two years since that day, our labs and several others have advanced neuroscience, computer science and microelectronics to create ways for rats, monkeys and eventually humans to control mechanical and electronic machines purely by "thinking through," or imagining, the motions. Our immediate goal is to help a person who has been unable to move by a neurological (神经的) disorder or spinal cord (脊髓) injury, but whose motor codex is spared, to operate a wheelchair or a robotic limb.
Belle would be fed some fruit juice if she
A．grasped the joystick.
B．moved the joystick to the side of the light.
C．sat quietly in a special chair.
D．watched lights on a display panel.
第5题
根据下列文章,请回答 41～45 题。
Controlling Robots with the Mind
Belle, our tiny monkey, was seated in her special chair inside A cha mber at our Duke University lab. Her right hand grasped a joystick (操纵杆) as she watched A horizontal series of lights on adisplay panel. She knew that if alight suddenly sho, ne and she moved the joystick left or right to correspond to its position, she would be sent adrop of fruit juice into her mouth.
Belle wore A cap glued to her head. Under it were four plastic connectors, which fed arrays of microwires - each wire finer than the finest sewing thread- into different regions of Belle's motor cortex, the brain tissue that plans movements and sends instructions. Each of the 100 microwires lay beside A single motor neuron (神经元) When aneuron produced an electrical discharge, the adjacent microwire would capture the current and send it up through asmall wiring bundle that ran from Belle's cap to A box of electronics on A table next to the booth. The box, in turn, was linked to two computers, one next door and the other half acountry a way.
After months of hard work, we were about to test the ide athat we could reliably translate the ra w electrical activity in aliving being's brain - Belle's mere thoughts - into signals that could direct the actions of arobot. We had assembled a multi jointed robot arm in this room, a way from Belle's view, which she would control for the first time. As soon as Belle's brain sensed alit spot on the panel, electronics in the box running two real-time mathematical models would rapidly analyze the tiny action potentials produced by her brain cells. Our lab computer would convert the electrical patterns into instructions that would direct the robot arm。 Six hundred miles north, in Ca mbridge, Mass, adifferent computer would produce the sa me actions in another robot arm built by Mandaya m A． Srinivasan, If we had done everything correctly, the two robot arms would beha ve as Belle's arm did, at exactly the sa me time.
Finally the moment ca me. We randomly switched on lights in front of Belle, and she immediately moved her joystick back and forth to correspond to them. Our robot arm moved similarly to Belle's real arm. So did Srinivasan's. Belle and the robots moved in synchrony (同步), like dancers choreographed (设计舞蹈动作) by the electrical impulses sparking in Belle's mind.
In the two years since that day, our labs and several others ha ve advanced neuroscience, computer science and microelectronics to create ways for rats, monkeys and eventually humans to control mechanical and electronic machines purely by"thinking through," or ima gining, the motions. Our immediate goal is to help A person who has been unable to move by A neurological (神经的) disorder or spinal cord (脊髓) injury,but whose motor cortex is spared, to operate A wheelchair or A robotic limb.
第 41 题 Belle would be fed some fruit juice if she
A．grasped the joystick.
B．moved the joystick to the side of the light.
C．sat quietly in A special chair.
D．watched lights on A display panel.
第6题
A deep hole was dug so that ______ could take any rats from the pile.
A．anybody
B．nobody
C．somebody
第7题
The best title for the text would be ______.
A．Killing Cats to Save Rats
B．Problems with Shipping Cats
C．Fighting between Cats and Rats
D．Keeping the Rat Population Down
第8题
The less crowded the space is, ______.
A．the more rats like to sleep and eat
B．the less rats want to live with others
C．the more rats try to kill each other
D．the less likely rats bite and kill each other
第9题
A．The experiments on the rats have nothing to do with humans.
B．The experiments on the rats are very important for animals.
C．The experiments on the rats are much the same on humans.
D．The experiments on the rats are much the same on other animals.
