Bên cạnh PHÂN TÍCH ĐỀ THI THẬT TASK 2 (dạng advantages & disadvantages) Some students work while studying. Discuss the advantages and disadvantages of this trend and give your opinion?NGÀY 04/8/2020 IELTS WRITING GENERAL MÁY TÍNH (kèm bài được sửa hs đi thi), IELTS TUTOR cũng cung cấp luyện đề Spider silk 2 (Đề thi IELTS READING 20/08/2023)
I. Kiến thức liên quan
II. Spider silk 2 (Đề thi IELTS READING 20/08/2023)
Spider silk 2
A strong, light bio-material made by genes from spiders could transform construction and industry
Scientists have succeeded in copying the silk-producing genes of the Golden Orb Weaver spider and are using them to create a synthetic material which they believe is the model for a new generation of advanced bio-materials. The new material, biosilk, which has been spun for the first time by researchers at DuPont, has an enormous range of potential uses in construction and manufacturing.
The attraction of the silk spun by the spider is a combination of great strength and enormous elasticity, which man-made fibres have been unable to replicate. On an equal-weight basis, spider silk is far stronger than steel and it is estimated that if a single strand could be made about 10m in diameter, it would be strong enough to stop a jumbo jet in flight. A third important factor is that it is extremely light. Army scientists are already looking at the possibilities of using it for lightweight, bulletproof vests and parachutes. >> IELTS TUTOR lưu ý: PHÂN TÍCH ĐỀ THI 30/5/2020"Some education systems make students focus on certain subjects at the age of 15, while others require students to study a wide range of subjects until they leave school. What are the benefits of each system? Which is better?"IELTS WRITING TASK 2 (kèm bài sửa HS đạt 6.5)
For some time, biochemists have been trying to synthesise the drag-line silk of the Golden Orb Weaver. The drag-line silk, which forms the radial arms of the web, is stronger than the other parts of the web and some biochemists believe a synthetic version could prove to be as important a material as nylon, which has been around for 50 years, since the discoveries of Wallace Carothers and his team ushered in the age of polymers.
To recreate the material, scientists, including Randolph Lewis at the University of Wyoming, first examined the silk-producing gland of the spider. ‘We took out the glands that produce the silk and looked at the coding for the protein material they make, which is spun into a web. We then went looking for clones with the right DNA,’ he says.
At DuPont, researchers have used both yeast and bacteria as hosts to grow the raw material, which they have spun into fibres. Robert Dorsch, DuPont’s director of biochemical development, says the globules of protein, comparable with marbles in an egg, are harvested and processed. ‘We break open the bacteria, separate out the globules of protein and use them as the raw starting material. With yeast, the gene system can be designed so that the material excretes the protein outside the yeast for better access,’ he says.
‘The bacteria and the yeast produce the same protein, equivalent to that which the spider uses in the draglines of the web. The spider mixes the protein into a water-based solution and then spins it into a solid fibre in one go. Since we are not as clever as the spider and we are not using such sophisticated organisms, we substituted man-made approaches and dissolved the protein in chemical solvents, which are then spun to push the material through small holes to form the solid fibre.’
Researchers at DuPont say they envisage many possible uses for a new biosilk material. They say that earthquake-resistant suspension bridges hung from cables of synthetic spider silk fibres may become a reality. Stronger ropes, safer seat belts, shoe soles that do not wear out so quickly and tough new clothing are among the other applications. Biochemists such as Lewis see the potential range of uses of biosilk as almost limitless. ‘It is very strong and retains elasticity: there are no man-made materials that can mimic both these properties. It is also a biological material with all the advantages that have over petrochemicals,’ he says. >> IELTS TUTOR lưu ý: Phân tích & Sửa đề"Traffic and accommodation problems are increasing and the government should encourage some businesses to move from cities to rural areas. Does the advantages outweigh the disadvantages?" (ngày21/11/2020)
At DuPont’s laboratories, Dorsch is excited by the prospect of new super-strong materials but he warns they are many years away. ‘We are at an early stage but theoretical predictions are that we will wind up with a very strong, tough material, with an ability to absorb shock, which is stronger and tougher than the man-made materials that are conventionally available to us,’ he says.
The spider is not the only creature that has aroused the interest of material scientists. They have also become envious of the natural adhesive secreted by the sea mussel. It produces a protein adhesive to attach itself to rocks. It is tedious and expensive to extract the protein from the mussel, so researchers have already produced a synthetic gene for use in surrogate bacteria.
Reading Passage 1 has nine paragraphs, A-I
Which paragraph contains the following information?
Write the correct letter, A-I, in boxes 1-5 on your answer sheet.
1 a comparison of the ways two materials are used to replace silk-producing glands
2 predictions regarding the availability of the synthetic silk
3 ongoing research into other synthetic materials
4 the research into the part of the spider that manufactures silk. >> IELTS TUTOR lưu ý: Phân tích +kèm sửa bài"The table below shows the number of visitors in the UK and their average spending from 2003 to 2008" IELTS WRITING TASK 1 (table)
5 the possible application of the silk in civil engineering
Complete the flow-chart below.
Choose NO MORE THAN TWO WORDS from the passage for each answer.
Write your answers in boxes 6-10 on your answer sheet.
Synthetic gene grown in 6 or 7
globules of 8 .
dissolved in 9
passed through 10
to produce a solid fibre
Do the following statements agree with the information given in Reading Passage?
In boxes 11-13 on your answer sheet, write
TRUE if the statement is true
FALSE if the statement is false
NOT GIVEN if the information is not given in the passage
12 The spider produces silk of varying strengths.
13 Lewis and Dorsch co-operated in the synthetic production of silk.
|1. E||8. protein|
|2. H||9. chemical|
|3. I||10. holes|
|4. D||11. FALSE|
|5. G||12. TRUE|
|6. yeast||13. NOT GIVEN|