Biochemistry Regulation Gene Expression Prokaryotes Online Exam Quiz
Biochemistry Regulation Gene Expression Prokaryotes GK Quiz. Question and Answers related to Biochemistry Regulation Gene Expression Prokaryotes. MCQ (Multiple Choice Questions with answers about Biochemistry Regulation Gene Expression Prokaryotes
Which of the following is the most appropriate definition of an operator?
Options
A : A non-coding, regulatory DNA sequence that is bound by RNA polymerase
B : A non-coding, regulatory DNA sequence that is bound by a repressor protein
C : A DNA-binding protein that regulates gene expression
D : A cluster of genes that are regulated by a single promoter
Which of the following bacterial operon is not controlled by attenuation?
Options
A : Arabinose
B : Tryptophan
C : Leucine
D : Histidine
Which of the following statements is not correct?
Options
A : Bacteria possess only one type of RNA polymerase
B : Attenuation is a regulatory process used by bacteria to control the initiation of transcription
C : Repressor binds to operator
D : Bacterial genes are polycistronic
The mechanism by which CBP activates transcription is?
Options
A : CBP has DNA methyl transferase activity
B : CBP has histone acetyl transferase activity
C : CBP interacts with the basal transcription complex
D : CBP interacts with the basal transcription complex and has histone acetyl transferase activity
Which of the following statements about lac operon in e.coli is true?
Options
A : Promoter is the binding site for the lac repressor
B : Operon is only switched on in the absence of lactose in the growth medium
C : ?-galactosidase is only produced in large quantities when the lac repressor is bound to the operator
D : Lac operon mRNA is a polycistronic mRNA
Which of the following statements regarding the regulation of trp operon expression by attenuation is correct?
Options
A : Rapid translation of the leader peptide prevents completion of mRNA transcript
B : Rapid translation of the leader peptide allows completion of mRNA transcript
C : The leader peptide sequence encodes enzymes required for tryptophan synthesis
D : The leader peptide sequence contains no tryptophan residues
Which of the following about mRNA stability is not correct?
Options
A : Regulation of mRNA stability is a way of regulating gene expression
B : Prokaryotic mRNAs have a half-life of only a few minutes
C : Histone mRNAs have especially long poly-A tails and are stable
D : It is thought that poly-A tails stabilize eukaryotic mRNAs
RNAi stands for ____________
Options
A : RNA inducer
B : RNA interference
C : RNA intron
D : RNA insertion
Which of the following increases gene expression as much as 200-fold?
Options
A : TATA box
B : Insulator
C : Enhancer
D : CAAT box
To which class of transcription factor do nuclear receptors belong?
Options
A : Zinc finger proteins
B : Leucine zipper proteins
C : Helix-turn-helix proteins
D : Helix-loop-helix proteins
Chemical Engineering Basics - Part 1 more Online Exam Quiz
Biochemistry Protein Tertiary Quaternary Structures
Biochemistry Regulation Cell Cycle Protein Kinases
Biochemistry Regulation Metabolic Pathways
Biochemistry Regulation Oxidative Phosphorylation
Biochemistry Regulation Transcription Steroid Hormones