已选分类
医学基础医学
单选题逆转录的方向是
单选题下列哪项最能反映脓肿的本质
单选题A．颗粒细胞B．内膜细胞C．卵母细胞D．成纤维细胞
单选题左心的附壁血栓脱落后可导致
单选题有关近球小管对Na
+
的重吸收，下列哪一项叙述正确
单选题A．四氢生物蝶呤
B．维生素B
12
C．磷酸吡哆醛
D．NAD
+
单选题影响PTH分泌最重要的因素是
单选题对蛋白激酶A的叙述不正确的是
单选题男性，74岁，患有亚急性感染性心内膜炎，并有房颤病史，某天清晨，突然觉得四肢活动不灵，麻木感，可能的原因是
单选题When a disease of epidemic proportions threatens the public, scientists immediately get to work, trying to locate the source of affliction and find ways to combat. Vaccination is one of the effective ways to protect the (1) population of a region or country which may be (2) grave risk. The process of vaccination allows the patient's body to (3) immunity to the virus or disease so that, if it is encountered, one can fight it (4) naturally. To accomplish this, a small weak or dead (5) of the disease is actually injected into the patient in a controlled environment, (6) his body's immune system can learn to fight the invader (7) . Information (8) how to penetrate the disease's defenses is (9) to all elements of the patient's immune system in a process that occurs naturally, in which genetic information is passed from cell to cell. This makes sure that (10) the patient later come into contact with the real problem, his body is well equipped and trained to (11) with it, having already done so before. There are, however, dangers (12) in the process. (13) , even the weakened version of the disease contained in the vaccine proves (14) much for the body to handle, resulting in the immune system (15) , and, therefore, the patient's death. Such is the case of the smallpox vaccine, (16) to eradicate the smallpox epidemic that nearly (17) the whole Native American population and killed massive numbers of settlers. (18) 1 in 10,000 people who receive the vaccine (19) the smallpox disease from the vaccine itself and dies from it. Consequently, the process, which is truly a (20) , may indeed hide some hidden curses.
单选题A．IgAB．IgEC．IgGD．IgM
单选题子宫平滑肌瘤与子宫平滑肌肉瘤镜下的主要鉴别要点是
单选题动脉粥样硬化的起始病变是
单选题上皮非典型性增生是指
单选题心脏每搏输出量的70%是在哪个时期完成的
单选题下列物质中升血压作用最强的是
单选题非霍奇金淋巴瘤工作分类中，高度恶性的是
单选题A．胞液B．线粒体C．胞液和内质网D．溶酶体
单选题下列不符合皮肤基底细胞癌的描述是
单选题A．A基因B．I基因C．Z基因D．Y基因