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若四个检查项目均不低于Bu级，可按占多数的等级确定 若仅一个检查项目低于Bu级，定为Bu级 若不止一个检查项目低于Bu级，定为Cu级 若三个检查项目低于Bu级，定为Du级
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互补配对，烯醇式可与G.互补配对。在含有5—BU的培养基中培养大肠杆菌，得到少数突变体大肠杆菌，突变型大肠杆菌中的碱基数目不变，但（A.+T）/（C.+G）的碱基比例不同于原大肠杆菌。下列说法错误的是 A.5—BU诱发突变的机制是诱发DNA链发生碱基种类替换 5—BU诱发突变的机制是阻止碱基配对 培养过程中可导致A./T对变成G./C对 5—BU诱发突变发生在DNA分子复制过程中
5- BU诱发突变的机制是诱发DNA链发生碱基种类替换 5- BU诱发突变的机制是阻止碱基配对 培养过程中可导致A/T对变成G/C对，或G/C对变成A/T对 5- BU诱发突变发生在DNA分子复制过程中
Japan people Japanese Japaneses people of Japanese
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sheeps, people sheep, people sheeps, peoples sheep, peoples
sheep; people sheeps; people sheeps; peoples sheep; peoples
adopted adapted accompanied annoyed
若四个检查项目均不低于Bu级，则可按占多数的等级确定 若仅一个检查项目低于Bu级，则定为Bu级 若不止一个检查项目低于Bu级，则定为Cu级 若三个检查项目低于Bu级，则定为Du级
was it do they wastn't it didn't he
Million Millions of Lot A.lot
5- BU诱发突变的机制是诱发DNA链发生碱基种类替换 5- BU诱发突变的机制是阻止碱基配对 培养过程中可导致A/T对变成G/C对 5- BU诱发突变发生在DNA分子复制过程中
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horse; people horses; peoples cow; people sheep; people
sheeps, people sheep, people sheeps, peoples sheep, peoples
0.7ΔBD 0.7ΔBU 0.5ΔBD 0.5ΔBU
beng fu beng bu ben fu peng bu
5－BU诱发突变的机制是诱发DNA链发生碱基种类替换 5－BU诱发突变的机制是阻止碱基配对 培养过程中可导致A/T对变成G/C对，或G/C对变成A/T对 5－BU诱发突变发生在DNA分子复制过程中
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