皮皮学，免费搜题
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【多选题】
PBR322 的优点是( )A.
具有复制起点 ori ，保证质粒在 E.coil 种复制
B.
具有两种抗生素基调，氨苄西林抗性基因，和四环素抗性基因
C.
相对分子质量较小
D.
具有较高的拷贝数， 24 个克隆位点
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】根据短文内容及首字母提示补全单词。 Jack went to a barber's shop and had his hair cut, but when he came out, he was not (1)_h_______ with the result. When his friend Bob saw him, he (2)l_______ and said, 'What happen...
【简答题】春暖花开，老师组织同学们到郊外野炊。活动中，同学们携带了铁锅、鸡蛋、面条、西红柿、食用油、食盐、味精、食醋、去污粉（有效成份为碳酸钠）等物品。 （1）从同学们所带的食物中挑选出能为人体提供较多维生素的一种食物是____________（填写所选食物的名称）,在大家所带食物中还缺少的一种人体所必需的营养素是___________（填写营养素的名称） （2）携带过程中，不慎将装食盐、去污粉的瓶子混淆了...
【简答题】My six-year-old granddaughter, Caitlyn, and I stopped at a Tim Horton’s shop for a blueberry cake. As we were going out of the door, a young age boy was coming in. This young man had no hair on si...
【简答题】一般在 造林结束后( )天进行造林面积检查。也可延至造林成活率检查时进行。
【单选题】What should we avoid doing if we want succeed according to the conversation?
A.
Being ready to accept others' advice.
B.
Not being too self-confident.
C.
Beating Endurance and persistence.
D.
Having a disproportional belief in one' ability.
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