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Medicine comes in lots of different packages. Painkillers in a tablet can make your headache go away. Antibiotic cream (抗菌素膏) from a tube can pr your cuts from becoming infected. But can medicine come packaged in chicken eggs? A team of scientists from Scotland say “yes”. They’ve engineered special chickens that lay eggs with disease-treating drugs inside. These eggs come from chickens that have been engineered to produce certain drugs inside their egg whites. These drugs are made of molecules called proteins(蛋白质). Animals make thousands of proteins — they’re the main element in skin, hair, milk and meat. Since animals can make proteins easily, they’re good candidates (候选者) for protein drugs. Researchers have already made cows, sheep and goats produce protein drugs in their milk. But chickens are cheaper to take care of, need less room, and grow faster than these other animals. Those qualities could make chickens a better choice to become living drug factories, says Simon Lillico of the Roslin Institute near Edinburgh, Scotland. Lillico and a team of researchers changed chickens’ DNA — the code that tells cells how to make proteins — so that the birds’ cells made two protein drugs. One drug can treat skin cancer, and the other treats a nerve disease called multiple sclerosis (多发性硬化). The scientists changed the chickens’ DNA so that the birds made these drugs only in their egg whites. This protects the chickens’ bodies from the drugs’ possible harmful effects and makes it easy for scientists to collect the drugs. 小题1:If you cut your finger, you may use ________ to cure it. A.painkillers in a tablet B.antibiotic cream from a tube C.chicken eggs D.protein drugs 小题2:Which of the following statements is NOT true? A.Scientists from Scotland have succeeded in packing medicine into chicken eggs. B.The drugs are made of molecules called proteins. C.Scientists chose chickens for their experiments because chicken eggs taste delicious. D.The animals are good candidates for protein drugs. 小题3:The drugs in special chicken eggs can ________. A.treat lung cancer B.help reduce headache C.change people’s DNA D.treat multiple sclerosis 小题4:We can infer from the passage that ________. A.eating eggs is the best choice for the patients now B.scientists changed the chicken’s DNA and put all the drugs in chicken eggs C.we may eat special eggs as drugs when we are sick in the future D.the drugs produce harmful effects on the chicken’s bodies 小题5:The best title for the passage is ________. A.Chicken Eggs to Replace Medicine B.Chicken Eggs as Drug C.Chicken Eggs and Medicine D.Chicken Eggs and Animal Milk

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刷刷题刷刷变学霸
举一反三

【单选题】蛋白质的等电点是指()

A.
蛋白质溶液的pH值等于7时溶液的pH值
B.
蛋白质溶液的pH值等于7.4时溶液的pH值
C.
蛋白质分子呈正离子状态时溶液的pH值
D.
蛋白质分子呈负离子状态时溶液的pH值
E.
蛋白质分子的正电荷与负电荷相等时溶液的pH值

【单选题】蛋白质属于()

A.
植物化学物
B.
宏量营养素
C.
微量元素
D.
宏量元素
E.
抗氧化营养素

【单选题】多发性硬化眼部最常见的改变是( )

A.
视乳头炎
B.
急性球后视神经炎
C.
视乳头血管炎
D.
视乳头水肿
E.
缺血性视神经病变

【单选题】()为蛋白质的基本结构。

A.
一级结构
B.
二级结构
C.
三级结构
D.
四级结构

【单选题】蛋白质的一级结构指的是

A.
蛋白质的 α- 螺旋结构
B.
蛋白质分子的无规则卷曲
C.
蛋白质分子内氨基酸以肽键相连接
D.
蛋白质分子内氨基酸的排列顺序

【单选题】多发性硬化()

A.
血乳酸升高,活动后更明显
B.
血清抗空肠弯曲菌抗体阳性
C.
血清抗心磷脂抗体阳性
D.
血清CK显著升高20~30倍
E.
寡克隆区带在脑脊液阳性,在血中阴性

【单选题】脑内多发性硬化最常见部位是()

A.
侧脑室周围白质
B.
视交叉及视神经
C.
基底节
D.
脑干
E.
小脑白质