试题与答案

口腔临床检查时发现某患者牙龈因炎症有颜色改变,龈袋深度2mm,舌侧有龈下石,探诊后出

题型:单项选择题

题目:

口腔临床检查时发现某患者牙龈因炎症有颜色改变,龈袋深度2mm,舌侧有龈下石,探诊后出血,用CPI指数标准记分应为

A.0
B.1
C.2
D.3
E.4

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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DNA的分子结构并不是一成不变的,在各种心理因素或环境因素的影响下,DNA上碱基排列顺序即遗传密码可能发生改变,从而引起基因突变。即使在正常情况下,DNA复制过程中也发生频率极低的突变。这段话主要支持的观点是( )

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B.DNA的突变是因为遗传密码发生改变

C.DNA复制过程中不会发生突变

D.DNA复制过程中经常会发生突变

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