1. What is the primary role of messenger RNA (mRNA) in gene expression?

 To form the structural and catalytic core of ribosomes

 To unwind the DNA double helix during replication

 To transport specific amino acids to the ribosome during translation

 To carry genetic information from DNA to the ribosome for protein synthesis

2. Epigenetics refers to _______

 Changes in the DNA sequence itself

 Protein degradation pathways

 Mutations occurring in RNA molecules

 Heritable changes in gene expression without alteration of DNA sequence

3. In the lac operon, the presence of lactose leads to _______

 Activation of gene expression

 Termination of transcription

 Inhibition of translation

 Repression of gene expression

4. The relationship between genotype and phenotype is _______

 Independent of environmental influence

 Always linear

 Fixed and unchangeable

 Complex and regulated by genetic and environmental interactions

5. During transcription in eukaryotes, which statement best describes how genetic information is copied?

 RNA polymerase copies both DNA strands simultaneously into double-stranded RNA

 RNA polymerase uses one DNA strand as a template to synthesize a complementary RNA strand

 Ribosomes read DNA directly to produce a polypeptide chain

 DNA polymerase uses RNA as a template to synthesize a new DNA strand

6. DNA methylation generally leads to _______

 Gene activation

 RNA degradation

 Protein synthesis

 Gene silencing

7. Molecular chaperones primarily assist in _______

 DNA replication and repair

 Regulation of cell division

 Correct folding and refolding of proteins

 RNA transcription and processing

8. RNA splicing primarily involves the removal of _______ from pre-mRNA

 Introns

 Exons

 Codons

 Promoter sequences

9. Enhancers function is to _______

 Inhibit translation

 Increase gene expression

 Terminate transcription

 Degrade RNA

10. Codon–anticodon pairing during translation ensures _______

 RNA degradation

 Proper protein folding

 Correct amino acid incorporation into the polypeptide chain

 DNA replication fidelity

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Question 1 of 10

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Gene Expression MCQs

Gene Expression is the process by which information encoded in DNA is converted into functional products—primarily proteins or functional RNAs.

It occurs in two main stages:

• Transcription: DNA is copied into messenger RNA (mRNA).
• Translation: mRNA is decoded by ribosomes to synthesize proteins.

Gene expression is tightly regulated at multiple levels (epigenetic, transcriptional, post-transcriptional, and translational), allowing cells to control when, where, and how much of a gene product is produced, which underlies cell differentiation, development, and environmental responses.