Chọn câu đúng 1. Phản ứng Biuret dương tính cho tất cả các acid amin
2. Acid amin serin có chứa nhóm – SH
3. Glutathiol chứa acid glutamic, glycin, histidin
4. Các tripeptide, protein luôn cho phản ứng Biuret dương tính

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation:

voluntary muscles are controlled by the cerebellum.

dna is a set of a gene held together by a chemical bond

carbon traps heat so more of it makes it hotter causing global warming. during the ice age carbon levels in the atmosphere were low so it got very cold. so the common things between them is carbon levels in the atmosphere.