第一章单元测试
- The nitrogen content of one protein sample is 0.5g，and then the protein content of it is ：（ ）
- Which of the followings is basic AA? （ ）
- Which of the following about α-helix is not correct：（ ）
- One AA( pI=5.6 ) will be negatively charged in a solution （ ）?
- Which of the following about protein denaturaion is not correct?（ ）
- All the common proein absorb light at a wavelength of UV close to （ ） nm?
- The amino acid found as constituents of mammalian proteins are all ( ) except for glycine?（ ）
- Which of the following about protein secondary structure is not correct? （ ）
- Which of the following about quaternary structue is correct? （ ）
- α helix of protein structure belongs to（ ）
A:1.565g B:3.125g C:1.25g D:12.5g E:6.25g
答案:3.125g
A:Glu B:Pro C:Lys D:Tyr E:Met
答案:Lys
A:the helix is right handed B:the helix is clockwise C:the peptide bonds are the major bonds to stabilize the helix D:one pitch is 0.54nm E:3.6 residues per circle
答案:the peptide bonds are the major bonds to stabilize the helix
A:pH8.6 B:pH4.7 C:pH2.6 D:pH5.0 E:pH5.6
答案:pH8.6
A:the physico-chemical property of protein changed B:precipitated protein not be sure to be denatured(C) C:denatured protein must precipitate D:The spatial structure of protein are destroied E:the secondary bond of protein are broken
答案:denatured protein must precipitate
A:260nm B:340nm C:200nm D:280nm E:300nm
答案:280nm
A:D-β-AA B:L-β-AA C:L-α-AA D:D-α-AA E:L，D-α-AA
答案:L-α-AA
A:it did not involve in the conformation of side chain of amnio acid B:amino acid sequence of protein C:it is local spatial structure of one certain part of peptide chain in protein D:it is the relative spatial position of skeleton atom on protein main chain E:it is hydrogen bond that maintain the stability of protein secondary structure
答案:amino acid sequence of protein
A:all the protein have quaternary structure B:quaternary structure of protein would not sure to be destoried C:the subunit were polymerized by noncovalent bond D:quaternary structure was essential condition for maintaining the protein biological activity E:the stability of protein quaternary structure was maintained by disulfide bond
答案:the subunit were polymerized by noncovalent bond
A:motif B:tertiary structure C:quaternary structure D:domain E:secondary structure
答案:secondary structure
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