Gene Expression and Regulation MCQs with Answers

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Welcome to the Gene Expression and Regulation MCQs with Answers. In this post, we have shared Gene Expression and Regulation Online Test for different competitive exams. Find practice Gene Expression and Regulation Practice Questions with answers in Biology Tests exams here. Each question offers a chance to enhance your knowledge regarding Gene Expression and Regulation.

Gene Expression and Regulation Online Quiz

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Test Name: Gene Expression and Regulation MCQ Quiz Practice
Type: Quiz Test
Total Questions: 40
Total Marks: 40
Time: 40 minutes

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Gene Expression and Regulation

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1 / 40

What is the role of a promoter in gene expression?

Splices RNA

Initiates transcription

Terminates transcription

2 / 40

What is a feedback inhibition in gene regulation?

A method where the end product of a pathway inhibits an earlier step

A method of splicing RNA

A process that enhances gene expression

3 / 40

What is the difference between positive and negative gene regulation?

Positive regulation increases transcription, negative regulation decreases transcription

Positive regulation decreases transcription, negative regulation increases transcription

Both increase transcription

4 / 40

What is the primary function of the lac repressor?

Degrades lactose

Inhibits the lac operon in the absence of lactose

Enhances the lac operon

5 / 40

What is alternative splicing?

Synthesizing RNA from DNA

Degrading mRNA

Producing different mRNAs from the same transcript

6 / 40

What is chromatin remodeling?

The degradation of mRNA

The dynamic modification of chromatin architecture to allow access of condensed genomic DNA to the regulatory transcription machinery proteins

The splicing of RNA

7 / 40

What is a transcriptional repressor?

A protein that binds to specific DNA sequences to inhibit transcription

An enzyme that synthesizes RNA

A protein that enhances transcription

8 / 40

What is RNA interference (RNAi)?

A method of sequencing RNA

A way to synthesize RNA

A biological process in which RNA molecules inhibit gene expression

9 / 40

Which process removes introns from pre-mRNA?

Translation

RNA splicing

Transcription

10 / 40

What is gene silencing?

Inhibition of gene expression

Duplication of genes

Activation of gene expression

11 / 40

What is the function of a terminator in transcription?

Initiates transcription

Enhances translation

Signals the end of transcription

12 / 40

What is a silencer sequence?

A protein that degrades mRNA

A DNA sequence capable of binding repressors to inhibit gene transcription

A sequence that enhances transcription

13 / 40

What is the primary mechanism by which gene expression is regulated in prokaryotes?

Operon model

RNA splicing

Chromatin remodeling

14 / 40

What is a constitutive gene?

A gene that is continuously expressed

A gene that is inactive

A gene that is regulated

15 / 40

What is the function of the 5' cap in eukaryotic mRNA?

Enhances DNA replication

Protects mRNA from degradation and assists in ribosome binding during translation

Marks mRNA for splicing

16 / 40

What is a transcriptional activator?

A protein that increases gene transcription

A protein that inhibits transcription

An enzyme that degrades RNA

17 / 40

What is the role of enhancers in eukaryotic gene regulation?

Splice RNA

Enhance the transcription of associated genes

Inhibit gene transcription

18 / 40

What is the function of a core promoter in transcription?

The region where mRNA is degraded

The region where RNA is spliced

The region where RNA polymerase binds to initiate transcription

19 / 40

What is epigenetic regulation?

Mutation in genes

Changes in protein structure

Gene expression regulation through DNA modifications not involving changes in the DNA sequence

20 / 40

What is a gene expression profile?

The sequence of genes

The pattern of genes expressed in a cell at a given time

The number of chromosomes

21 / 40

What is the function of riboswitches in gene regulation?

Regulatory segments of mRNA that bind small molecules to regulate gene expression

DNA sequences that regulate transcription

Protein segments that bind to DNA

22 / 40

What is the role of histone acetylation in gene expression?

Decreases transcription

Increases transcription

Splices RNA

23 / 40

What is the role of mediator proteins in gene expression?

Splice RNA

Assist in the assembly of the transcription complex

Degrade mRNA

24 / 40

What is the role of a ribosome in gene expression?

Synthesizes DNA

Synthesizes proteins from mRNA

Splices RNA

25 / 40

What is the lac operon?

A type of RNA molecule

A group of genes involved in lactose metabolism

A gene regulating cell division

26 / 40

What is the significance of the poly-A tail in mRNA?

Stabilizes mRNA and regulates its translation

Enhances transcription

Marks mRNA for degradation

27 / 40

What is an operon?

A type of RNA molecule

A group of genes regulated together

A single gene

28 / 40

What is an operon model an example of?

Prokaryotic gene regulation

Viral gene regulation

Eukaryotic gene regulation

29 / 40

What is the function of a transcription factor?

Replicates DNA

Regulates gene expression

Synthesizes proteins

30 / 40

What is a regulatory gene?

A gene coding for structural proteins

A gene coding for enzymes

A gene involved in controlling the expression of one or more other genes

31 / 40

How do transcription factors influence gene expression?

By synthesizing proteins

By binding to DNA sequences near genes and regulating transcription

By degrading mRNA

32 / 40

What is the role of ubiquitin in post-translational regulation?

Tags proteins for degradation

Enhances protein synthesis

Regulates RNA splicing

33 / 40

What is an enhancer?

A protein that degrades mRNA

An enzyme that synthesizes RNA

A DNA sequence that increases transcription

34 / 40

What is the function of a repressor protein?

Inhibits transcription

Enhances transcription

Synthesizes RNA

35 / 40

What is post-transcriptional regulation?

Regulation during protein synthesis

Regulation of gene expression after mRNA is produced

Regulation at the DNA level

36 / 40

Which molecule initiates transcription in eukaryotes?

RNA polymerase

DNA polymerase

Ribosome

37 / 40

What is an inducible operon?

An operon that can be turned on by the presence of a specific molecule

An operon that is always on

An operon that is always off

38 / 40

What is the TATA box?

A protein involved in translation

An enzyme that repairs DNA

A DNA sequence indicating where a genetic sequence can be read and decoded

39 / 40

What is the function of siRNA in gene regulation?

Silences gene expression by degrading mRNA

Replicates DNA

Enhances protein synthesis

40 / 40

What are microRNAs (miRNAs)?

Small non-coding RNAs that regulate gene expression

Proteins involved in translation

DNA sequences

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admin4 weeks ago

0 22 1 minute read