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【单选题】

Interferon For several years, scientists have been testing a substance called interferon (干扰素),a potential wonder drug that is proving to be effective in treating a variety of ailments, including virus infections, bacteria infections, and tumors. To date, the new drug has provoked no negative reaction of sufficient significance to discourage its use. But in spite of its success, last year only one gram was produced in the entire world. The reason for the scarcity lies in the structure of interferon. A species specific protein, the interferon produced from one animal species cannot be used in treating another animal species. In other words, to treat human beings, only interferon produced by human beings may be used. The drug is produced by infecting white blood cells with a virus. Fortunately, it is so potent that the amount given each patient per injection is very small. Unlike antibiotics(抗菌素), interferon does not attack germs directly. Instead, it makes unaffected cells resistant to infection, and prs the multiplication of viruses within cells. As you might conclude, one of the most dramatic uses of interferon has been in the treatment of cancer. Dr. Hans Strander, research physician at Sweden’’s famous Karolinska Institute, has treated more than one hundred cancer patients with the new drug. Among a group of selected patients who had undergone surgical procedures for advanced cancer, half were given conventional treatments and the other half were given interferon. The survival rate over a three-year period was 70 percent among those who were treated with interferon as compared with only 10 to 30 percent among those who had received the conventional treatments. In the United States, a large-scale project supported by the American Cancer Society is now underway. If the experiment is successful, interferon could become one of the greatest medical discoveries of our time. Interferon has serious side effects, whereas antibiotics do not.

A.
Right
B.
Wrong
C.
Not Mentioned
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参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】干扰素的特点是:

A.
属于多糖类物质
B.
分为Ⅰ、Ⅱ、Ⅲ三种类型
C.
可直接抑制病毒的复制
D.
由感染机体的病毒合成
E.
具有抗病毒作用

【单选题】对头孢菌素的错误描述为()

A.
与青霉素仅有部分交叉过敏现象
B.
抗菌作用机制与青霉素类似
C.
与青霉素类协同抗菌作用
D.
第三代药物对革兰阳性菌和革兰阴性菌的作用均比第一、二代强
E.
第一、二代药物对肾均有毒性

【单选题】关于干扰素,正确的是

A.
机体细胞自主合成
B.
间接杀伤病毒作用
C.
B淋巴细胞合成
D.
特异性免疫分子
E.
化学性质是脂类

【单选题】头孢菌素类抗生素在发展过程中,按其发明年代的先后和抗菌性能的不同,在临床上可将其划分一、二、三、四代 第一代头孢菌素

A.
对革兰阳性菌和β-内酰胺酶的抵抗能力较弱
B.
对革兰阴性菌和β-内酰胺酶的抵抗能力较弱
C.
抗菌谱广
D.
对革兰阴性菌活性较强
E.
以上答案都不符合

【单选题】下列关于干扰素的描述错误的是:

A.
具有广谱抗病毒作用
B.
直接杀伤病毒
C.
由宿主细胞产生
D.
是一组具有高活性的多功能糖蛋白
E.
在适应性免疫之前发挥作用