Statement: What a fool I am to rely on trickster like Shaleen ! Assumptions: Shaleen is unreliable. I am a fool. p> ?->(Show Answer!)

1. Statement: What a fool I am to rely on trickster like Shaleen ! Assumptions: Shaleen is unreliable. I am a fool.

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MCQ-> Cells are the ultimate multi-taskers: they can switch on genes and carry out their orders, talk to each other, divide in two, and much more, all at the same time. But they couldn’t do any of these tricks without a power source to generate movement. The inside of a cell bustles with more traffic than Delhi roads, and, like all vehicles, the cell’s moving parts need engines. Physicists and biologists have looked ‘under the hood’ of the cell and laid out the nuts and bolts of molecular engines.The ability of such engines to convert chemical energy into motion is the envy nanotechnology researchers looking for ways to power molecule-sized devices. Medical researchers also want to understand how these engines work. Because these molecules are essential for cell division, scientists hope to shut down the rampant growth of cancer cells by deactivating certain motors. Improving motor-driven transport in nerve cells may also be helpful for treating diseases such as Alzheimer’s, Parkinson’s or ALS, also known as Lou Gehrig’s disease.We wouldn’t make it far in life without motor proteins. Our muscles wouldn’t contract. We couldn’t grow, because the growth process requires cells to duplicate their machinery and pull the copies apart. And our genes would be silent without the services of messenger RNA, which carries genetic instructions over to the cell’s protein-making factories. The movements that make these cellular activities possible occur along a complex network of threadlike fibers, or polymers, along which bundles of molecules travel like trams. The engines that power the cell’s freight are three families of proteins, called myosin, kinesin and dynein. For fuel, these proteins burn molecules of ATP, which cells make when they break down the carbohydrates and fats from the foods we eat. The energy from burning ATP causes changes in the proteins’ shape that allow them to heave themselves along the polymer track. The results are impressive: In one second, these molecules can travel between 50 and 100 times their own diameter. If a car with a five-foot-wide engine were as efficient, it would travel 170 to 340 kilometres per hour.Ronald Vale, a researcher at the Howard Hughes Medical Institute and the University of California at San Francisco, and Ronald Milligan of the Scripps Research Institute have realized a long-awaited goal by reconstructing the process by which myosin and kinesin move, almost down to the atom. The dynein motor, on the other hand, is still poorly understood. Myosin molecules, best known for their role in muscle contraction, form chains that lie between filaments of another protein called actin. Each myosin molecule has a tiny head that pokes out from the chain like oars from a canoe. Just as rowers propel their boat by stroking their oars through the water, the myosin molecules stick their heads into the actin and hoist themselves forward along the filament. While myosin moves along in short strokes, its cousin kinesin walks steadily along a different type of filament called a microtubule. Instead of using a projecting head as a lever, kinesin walks on two ‘legs’. Based on these differences, researchers used to think that myosin and kinesin were virtually unrelated. But newly discovered similarities in the motors’ ATP-processing machinery now suggest that they share a common ancestor — molecule. At this point, scientists can only speculate as to what type of primitive cell-like structure this ancestor occupied as it learned to burn ATP and use the energy to change shape. “We’ll never really know, because we can’t dig up the remains of ancient proteins, but that was probably a big evolutionary leap,” says Vale.On a slightly larger scale, loner cells like sperm or infectious bacteria are prime movers that resolutely push their way through to other cells. As L. Mahadevan and Paul Matsudaira of the Massachusetts Institute of Technology explain, the engines in this case are springs or ratchets that are clusters of molecules, rather than single proteins like myosin and kinesin. Researchers don’t yet fully understand these engines’ fueling process or the details of how they move, but the result is a force to be reckoned with. For example, one such engine is a spring-like stalk connecting a single-celled organism called a vorticellid to the leaf fragment it calls home. When exposed to calcium, the spring contracts, yanking the vorticellid down at speeds approaching three inches (eight centimetres) per second.Springs like this are coiled bundles of filaments that expand or contract in response to chemical cues. A wave of positively charged calcium ions, for example, neutralizes the negative charges that keep the filaments extended. Some sperm use spring-like engines made of actin filaments to shoot out a barb that penetrates the layers that surround an egg. And certain viruses use a similar apparatus to shoot their DNA into the host’s cell. Ratchets are also useful for moving whole cells, including some other sperm and pathogens. These engines are filaments that simply grow at one end, attracting chemical building blocks from nearby. Because the other end is anchored in place, the growing end pushes against any barrier that gets in its way.Both springs and ratchets are made up of small units that each move just slightly, but collectively produce a powerful movement. Ultimately, Mahadevan and Matsudaira hope to better understand just how these particles create an effect that seems to be so much more than the sum of its parts. Might such an understanding provide inspiration for ways to power artificial nano-sized devices in the future? “The short answer is absolutely,” says Mahadevan. “Biology has had a lot more time to evolve enormous richness in design for different organisms. Hopefully, studying these structures will not only improve our understanding of the biological world, it will also enable us to copy them, take apart their components and recreate them for other purpose.”According to the author, research on the power source of movement in cells can contribute to
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MCQ-> Read the following passage carefully and answer the question given below it Certain words/phrases have been printed in bold to help you locate them while answering some of the questionsOnce a king saw some young boys pelting stones on a snake. He prevented the boys from killing the snake. Thus he saved its life.The snake, which was the King of the Snake World, thanked him and favoured him with a supernatural gift by which he could understand the language of any animal. But he warned him that that divulgence of the secret would cost him his life. One day, when the King was sitting in his garden and enjoying breakfast, a small portion of the sweet fell on the ground.Soon he heard an ant shouting, “My God”, what a big wagon-ful of sweet has fallen and there is none to consume it.Ah ! I can enjoy all, now.”Hearing this, the King smiled and chuckled.The queen, who was sitting next to him,was curious to note the changing countenance of the King.She asked him to tell her the reason for the smile. But the King kept silence,she attacked his self-respect by calling him a “liar” and muttered that all his expressions of endearment like-You are dearer to me than my very life”.-were nothing but a pack of lies.The King, however,could not bear the attacks on his self-respect and eventually conceded to divulge the secret on the following day in the royal,garden; and made up his mind to sacrifice his life. A donkey overheard the King’s resolve and decided to save him,because the King was righteous.So, he picked up one of his friends-the goat and they both decided to save the King. Next day, when the King and his retinues were on the way to the royal park,the donkey and the goat stood conversing on one side of the path.The King overheard the goat saying to the donkey, “You are a fool but not as big a fool as in the king. “Having heard so, the King was curious to know as to why was he being called a “bigger fool”. So, he said to the goat. “Pray, then tell me what to do as I am now committed to tell her on her back”. When the King reached the garden he said to the queen “I am now ready to tell you the secret on the condition that you are willing to receive one hundred lashes in return”.The queen considered the condition a joke and nodded in agreement.The King then waved at one of his guards to lash her with all his power.And no sooner than she received two lashes she wailed and shouted “No ! No ! Stop, do not lash me ! I don’t want to know the secret now”. The King then said scornfully, “You wanted to know the secret at the cost of my life, but now you don’t want to know because you have to save your skin.You deserve a few more lashes.”But before he could order his man to give her a few more lashes, the King’s trustworthy minister intervened and requested him to forgive her.Thus the queen was not lashed further, yet she received the same honour and dignity.Why did the snake give a gift to the King ?
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