PASSAGE 22 In two studies publicly presented on Monday at the annual meeting of the American Society for Biochemistry and Molecular Biology in Orlando, Florida in the United States, scientists have disclosed new steps toward using natural adhesives made by the dusky Arion slug (Arion subfuscus) in medical applications such as in closing skin wounds and reducing scarring Arion slug secretes an unusual glue, making itself a difficult target for predators This glue remains both sticky and flexible and works even when the surface the slug is on is wet Previous studies have shown that, unlike many artificial adhesives, Arion slug glue is non-toxic to mammalian tissue Scientist Rebecca Falconer, an Ithaca College undergraduate who led one of the two studies, said "Typical sutures like staples and stitches often lead to scarring and create holes in the skin that could increase the chance of infection after surgery [ ] Understanding the roles of adhesive proteins in the slug glue would aid in the creation of a medical adhesive that can move and stretch yet still retain its strength and adhesiveness." In her set of experiments, Falconer observed eleven proteins found only in the Arion slug glue and used DNA recombination to produce usable amounts of each of these proteins, whereas Christopher Gallego-Lazo, also an Ithaca undergraduate, evaluated the glue by focusing on the chemical bonds within it Gallego-Lazo found that slight changes in these chemical bonds could alter the strength of the slug glue Gallego-Lazo said, "Few studies on biological adhesives have identified the exact nature of the bonds holding the glue together This knowledge can guide the development of an organic synthetic adhesive that would reduce the risk of infection and scarring compared to stitches and staples and could be applied rapidly and simply." (Adapted from Wikinews) Question The word “disclosed” in the passage is closest in meaning to A discovered B approved C revealed D proved Question The word “its” in the third paragraph refers to _ A slug glue B adhesive proteins C the creation D medical adhesive Question According to the passage, all of the following characteristics of the slug glue have been studied by scientists EXCEPT for _ A Inner chemical bonds B Toxicity C Adhesive proteins D DNA recombination Question What is the passage mainly about? A New discoveries about artificial adhesives B Ongoing research about a new type of organic glue C The drawbacks of typical sutures D Reducing the risk of infection caused by stiches and staples Question The chemical bonds of the slug glue are being studied because A they can directly alter the strength of the slug glue B they can be used to produce usable amounts of adhesive proteins C they can lead to infection like stiches and staples D they can provide scientists with useful information Page ĐÁP ÁN 1-C 2-D 3-D 4-B 5-D Page