1. Environmental factors influence gene expression through _______

 Regulatory networks and signaling pathways

 Protein degradation only

 Only DNA mutations

 Chromosome loss

2. Alternative splicing allows a single gene to _______

 Produce only one protein

 Encode multiple protein isoforms

 Avoid transcription

 Replicate faster

3. A mutation in the TATA box of a eukaryotic promoter will most likely _______

 Increase ribosome binding

 Increase translation efficiency

 Enhance mRNA stability

 Reduce transcription initiation

4. Which experimental approach best distinguishes between transcriptional and translational regulation of gene expression?

 DNA sequencing

 Western blot analysis only

 Combined qPCR and ribosome profiling

 Quantitative PCR (qPCR) only

5. A gene exhibits high mRNA abundance but low protein levels. The most plausible explanation is _______

 Rapid protein degradation or translational repression

 Increased promoter strength

 Efficient RNA splicing

 Enhanced transcription factor binding

6. A nonsense mutation occurring early in the coding sequence typically results in _______

 Enhanced translation efficiency

 Restoration of the reading frame

 A longer protein product

 A truncated protein due to a premature stop codon

7. Which of the following events occurs during the elongation phase of translation?

 Aminoacyl-tRNAs enter the ribosome, and peptide bonds form between amino acids

 A release factor binds to a stop codon, releasing the completed polypeptide

 RNA polymerase detaches from DNA at a terminator sequence

 The small ribosomal subunit binds to the mRNA start codon

8. What is the primary role of transfer RNA (tRNA) during translation?

 To act as an adaptor that matches specific amino acids to corresponding mRNA codons

 To serve as the template read by ribosomes for amino acid sequence

 To catalyze peptide bond formation between amino acids

 To replicate genetic material before cell division

9. In eukaryotic cells, transcription occurs in the _______

 Ribosome

 Golgi apparatus

 Cytoplasm

 Nucleus

10. Gene expression at the cellular level primarily involves _______

 Chromosomes only

 Cell wall

 Ribosomes and cytoplasmic machinery

 Nucleus only

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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.