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

 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

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

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

 Increase ribosome binding

 Reduce transcription initiation

 Increase translation efficiency

 Enhance mRNA stability

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

 Increased promoter strength

 Rapid protein degradation or translational repression

 Enhanced transcription factor binding

 Efficient RNA splicing

4. In eukaryotic cells, transcription occurs in the _______

 Nucleus

 Cytoplasm

 Golgi apparatus

 Ribosome

5. Alternative splicing allows a single gene to _______

 Replicate faster

 Avoid transcription

 Encode multiple protein isoforms

 Produce only one protein

6. Environmental factors influence gene expression through _______

 Protein degradation only

 Chromosome loss

 Only DNA mutations

 Regulatory networks and signaling pathways

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

 RNA polymerase detaches from DNA at a terminator sequence

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

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

 The small ribosomal subunit binds to the mRNA start codon

8. Gene expression at the cellular level primarily involves _______

 Chromosomes only

 Nucleus only

 Cell wall

 Ribosomes and cytoplasmic machinery

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

 A truncated protein due to a premature stop codon

 Enhanced translation efficiency

 Restoration of the reading frame

 A longer protein product

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

 DNA sequencing

 Combined qPCR and ribosome profiling

 Quantitative PCR (qPCR) only

 Western blot analysis 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.