Lesson 3.4.2
3.4.2 Differential gene expression and the lac operon Quiz: Pearson Edexcel Biology, Unit 3
20 questions
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Lesson 3.4.2, Differential gene expression and the lac operon: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 3: Voice of the Genome, written with Revision Ninja.
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The 20 questions
-
What term describes the selective transcription of specific genes in different cell types?
- Epigenetic cloning
- Genetic modification
- Differential gene expression
- Alternative splicing
-
Which molecule carries the genetic code from DNA in the nucleus to the ribosome?
- DNA polymerase
- tRNA
- mRNA
- rRNA
-
Where does the lac repressor protein bind in E. coli when lactose is absent?
- Operator
- Promoter
- Structural gene
- RNA polymerase
-
Which molecule binds to the lac repressor protein to prevent it from binding the operator?
- Maltose
- Glucose
- Lactose
- Galactose
-
Which enzyme is encoded by the lac operon and used to break down lactose?
- Pepsin
- Beta-galactosidase
- Amylase
- Catalase
-
What type of operon is switched on in the presence of its substrate?
- Repressible operon
- Constitutive operon
- Inducible operon
- Continuous operon
-
Which DNA region in an operon acts as the binding site for repressor proteins?
- Promoter
- Exon
- Terminator
- Operator
-
Why do human muscle cells and neurons have completely different structures and functions?
- Different genetic codes
- Different chromosome numbers
- Different genes present
- Different genes expressed
-
What process synthesises an mRNA molecule using a DNA template strand?
- Transcription
- Translation
- Translocation
- Replication
-
What process uses mRNA codons to assemble amino acids into a polypeptide?
- Splicing
- Translation
- Transcription
- Replication
-
What is the main advantage of producing lac operon enzymes only when lactose is present?
- Accelerates DNA replication
- Saves energy
- Increases cell size
- Saves water
-
If a repressor protein cannot bind to the lac operon operator, what happens to gene transcription?
- Terminated transcription
- Delayed transcription
- Continuous transcription
- No transcription
-
Which process causes an unspecialised cell to become a specialised cell?
- DNA replication
- Differential gene expression
- Protein denaturation
- Gene duplication
-
Which molecule is an inducer of the lac operon?
- Allolactose
- Lac repressor
- Beta-galactosidase
- Glucose
-
What state is the lac operon in when an added molecule fails to bind the repressor?
- Switched off
- Continuously active
- Fully induced
- Rapidly transcribed
-
Which mechanism is used by both plants and animals to produce specialised cells?
- Binary fission
- Gene duplication
- Differential gene expression
- Polyploidy
-
What is the primary function of the structural genes in the lac operon?
- Code for enzymes
- Bind repressor proteins
- Block promoter region
- Produce RNA polymerase
-
Why is the lac repressor protein classified as a negative control element?
- It degrades mRNA
- It activates promoters
- It unwinds DNA
- It blocks transcription
-
Where is the lac repressor protein bound when lactose is absent from E. coli?
- RNA polymerase
- Structural genes
- Promoter region
- Operator region
-
Which DNA region is the binding site for RNA polymerase to start transcription?
- The operator
- The intron
- The codon
- The promoter
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