第三章单元测试
- Which of following is correct about enzyme?（ ）
- Which of following is correct about character of enzyme?（ ）
- Specificity of enzyme refers to：（ ）
- Which of following is not correct about active site of an enzyme?（ ）
- Which of following is not correct about Km?（ ）
- The relationship between competitive inhibitor and substrate is that they have :（ ）
- Isoenzymes are enzymes that ：（ ）
- Which of following is not correct about allosteric enzyme? （ ）
- Which of following is not correct about covalent modification?（ ）
- Which of following is not correct about LDH isoenzymes?（ ）
A:the substrates of enzyme are all organic compounds B:catalytic DNA and RNA are not biocatalysts C:enzymes are biocatalysts that catalyze the multiple dynamic processes in the body D:all enzymes are proteins E:enzymes can not be updated in living tissue
答案:enzymes are biocatalysts that catalyze the multiple dynamic processes in the body
A:all the enzymes can accelerate the rates of reactions B:enzymes speed up reaction by elevating the activation energy C:all groups in active site are termed the essential groups D:enzymes can change equilibrium point of reaction E:the enzymes catalyze the reactions with high efficiency for its coenzyme or prosthetic group
A:different catalytic mechanism B:different classification of enzymes C:specific site that enzyme exist D:the ability of an enzyme to discriminate between two competing substrates E:enzymes have highly specificity for coenzymes
A:the enzymes which catalyze the same reaction have the same active site B:there are binding groups and catalytic groups in it C:it binds substrate and catalyzes the reaction D:all groups in active site are termed the essential groups E:it is formed by groups that primary structure is close to each other in the polypeptide sequence
A:Km is equivalent to the substrate concentration at which V is equal to Vmax/2 B:Km is one of the characteristic constants of the enzyme C:Km reflects approximately the affinity of enzyme to substrate D:Km is independent of enzyme structure E:Km is independent of enzyme concentration
A:same physico-chemical property B:same function C:same solubility D:similar structure E:same molecular weight
A:have the same immunological properties B:have the same physiocochemical properties C:have the same structure D:catalyze the same reaction E:show the same electrophoretic mobility
A:allosteric effector binds with enzyme noncovalently B:allosteric effector binds to active site of enzyme C:it contains many subunits D:it is known as rate-limiting enzyme E:allosteric effector binds with enzyme reversibly
A:enzyme binds with specific chemical groups covalently B:it consumes ATP C:activity of enzyme increased after phosphorylated D:it is a fast regulation E:the most common type is phosphorylation
A:different isoenzymes shows a characteristic electrophoretic mobility B:two subunits are products of different genes C:contains H and M subunits D:LDH has five different isoenzymes E:have the same Km to the same substrate
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