第一章单元测试
- All of the following amino acids are acidic or basic amino acids, EXCEPT（ ）.
- The amino acids that determine the UV-absorbing properties of proteins are（ ）.
- The protein molecule (PI=4.5) will mobile to the negative electrode when the PH of electrophoresis buffer is（ ）.
- Gel filtration chromatography is a method that can be used to separate and purify proteins, basing on the solubility of proteins（ ）
- What is primary structure of protein? Please state the relationships between the primary structure and
functions of proteins by an example.
A:Asp B:Ser C:Glu D:Lys
答案:Ser
A:Tryptophan, Phenylalanine, Tyrosine B:Histidine, Tryptophan, Phenylalanine C:Histidine, Proline, Phenylalanine D:Phenylalanine, Proline, Tyrosine
答案:Tryptophan, Phenylalanine, Tyrosine
A:PH=4.5 B:PH=5.0 C:PH=7.0 D:PH=3.0
答案:PH=3.0
A:对 B:错
答案:错
答案:The primary structure of a protein refers to the specific sequence of amino acids that make up the protein chain. An example illustrating the relationship between primary structure and function is the hormone insulin. Insulin consists of two polypeptide chains (A and B) linked by disulfide bridges. The precise arrangement of amino acids in its primary structure is crucial for its biological function. Any alteration in this sequence can lead to changes in insulin's ability to regulate blood glucose levels effectively, highlighting how the primary structure directly influences protein function.
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