物联网是一种非常复杂、形式多样的系统技术 。根据信息生成、传输、处理和应用的原则，可以把物联网分为4层：（）、网络构建层、管理服务层和（）。
Cell lysis is carried out by which substance? __________
A. Lysozyme and detergents
B. Water
C. Sugar solution
D. Suphuric Acid
Proteins can be removed via treatment by? __________
A. Phenol and chloroform treatment
B.Treatment with sodium hydroxide
Chloroform treatment alone
D. Centrifuging
Nucleic acid precipitated constitutes of ____________
A.plasmid DNA
B.plasmid DNA, along with RNA and chromosomal DNA
C.RNA alone
D.chromosomal DNA only
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