第七章单元测试
- Which is NOT a final product of gene expression?（ ）
- If a gene is expressed at relatively constant rate in almost all the cells, it is called a(an) （ ）
- The most efficient step of gene expression regulation is （ ）
- Which one is NOT a cis-acting element?（ ）
- The prokaryotic operator sequence is usually （ ） .
- In the regulation of lac operon, when the medium contains both glucose and lactose, which statement is true?（ ）
- In lac operon, repressor protein could bind to( )sequence.（ ）
- In the regulation of lac operon, when the medium contains only glucose, which statement is true?（ ）
- If a gene is expressed only in certain organs or tissues, this is called （ ）
- Which is NOT the basal cis-acting elements in eukaryotes?（ ）
- Enhancers must locate on the upstream region of promoter.（ ）
- The active chromatin usually shows low level of methylation.（ ）
A:rRNA B:mRNA C:tRNA D:protein
答案:mRNA
A:repressible gene B:inducible gene C:housekeeping gene D:constant gene
A:activation of chromosomes B:transcription initiation C:transcription termination D:translation initiation
A:promoter B:enhancer C:silencer D:activator protein
A:bound by CAP B:located on the downstream region of promoter C:located on the upstream region of promoter D:bound by RNA polymerase
A:repressor is active; CAP is inactive B:both repressor and CAP are inactive C:repressor is inactive; CAP is active D:both repressor and CAP are active
A:operator B:lac Z C:lac I D:promoter
A:concentration of cAMP is low, CAP is active B:concentration of cAMP is low, CAP is inactive C:concentration of cAMP is high, CAP is active D:concentration of cAMP is high, CAP is inactive
A:temporal specificity of gene expression B:none of the above C:stage specificity of gene expression D:spatial specificity of gene expression
A:enhancer B:promoter C:operator D:insulator
A:错 B:对
A:对 B:错
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