Prime Time 8. Coursebook plus Semester Self-checks, Schulbuch

Language in use I: Nanotechnology Read the text about nanotechnology. In most lines (1–10) there is a word that should not be there. Write these words in the spaces provided. 2–4 lines are correct. Make a ✔ in the space if the line is correct. There are two examples (0, 00) at the beginning. Nanotechnology is a diverse branch of the research and the 0 engineering working on the scale of atoms and molecules between ✔ 00 1 and 1000 nanometres. [1 nanometre (nm) is under one billionth 1 (10 -9 ) of a metre]. However, nanotechnology is employed to make 2 ultrasmall tools and then build powerful mini-machines smaller 3 than a pinhead set. A fly could carry a camera on its back! 4 One day, nano-machines, also called nano-robots, may ever be 5 able to replicate themselves and, for example, make designer drugs 6 specific not just to one disease but to one designer person. 7 Nanoparticles are so small that they can pass over boundaries 8 within the body, which poses more potential safety risks. 9 There is no doubt that nanotechnology will have a huge impact. 10 Language in use II: Stem cells Read the text about stem cells. Some words are missing. Choose the correct answer (A, B, C or D) for each gap (1–7). Put a cross ( ✘ ) in the correct box. The first one (0) has been done for you. Stem cells can be compared … 0 blank slates. … 1 regular cells, which can only replicate to create more of their own kind, stem cells are pluripotent: they can develop … 2 any type of cell in the human body. In addition, they also have the capability … 3 reproduce themselves many times over. There are two types of stem cells: embryonic stem cells and adult stem cells. Embryonic stem cells come from an embryo – the mass of cells … 4 the earliest stage of human development that, if implanted in a woman’s womb, will eventually grow into a foetus. When the embryo is … 5 three and five days old, it contains stem cells, which are busily working to create the various organs and tissues that will make … 6 the foetus. Adults also have stem cells in the heart, brain, bone marrow, lungs and other organs. They can regenerate cells damaged … 7 disease or injury. In general, adult stem cells are more limited than embryonic stem cells, but some types of adult stem cells are more versatile than others. 0 A on B to ✘ C over D by 1 A Like B Alike C Unlike D Likely 2 A into B to C onto D in 3 A into B of C on D to 4 A in B by C to D for 5 A by B between C under D over 6 A for B into C out of D up 7 A from B by C under D into 3 4 99 Nur zu Prüfzwe ken – Eigentum des Verlags öbv