【单选题】下列关于染色体畸变和基因突变的主要区别,错误的是()
A.
染色体结构变异是染色体的一个片段增加、缺失或替换等,而基因突变则是DNA分子碱基对的替换、增加或缺失
B.
原核生物和真核生物均可以发生基因突变,但只有真核生物能发生染色体畸变
C.
基因突变一般是微小突变,其对生物体影响较小,而染色体结构变异是较大的变异,其对生物体影响较大
D.
多数染色体结构变异可通过显微镜观察进行鉴别,而基因突变则不能
【简答题】¿A quién presenta Ronaldo a Raquel?
【简答题】When things aren’t going well, my parents always ______ (鼓励)me, telling me not to give up.
【判断题】商誉不具有实物形态,所以企业应当将其划分为无形资产核算。
【简答题】--Excuse me, but can you tell me the way to the post office? -- . A. Don’t ask that B Sorry, I’m a stranger here C No, I can't say that D No, you’re driving too fast
【单选题】They always ask me ____ hard.
【简答题】-Excuse me, where is Dr Smith's office? -________. A: You can't ask me. I don't know, either. B; Please don't say so. C; Sorry, I don't know. But you can ask the man over there.