1. A microRNA (miRNA) primarily regulates gene expression by _______

 Activating ribosomes

 Promoting DNA replication

 Enhancing transcription

 Binding to target mRNA to inhibit translation or promote its degradation

2. Ribosome stalling during translation elongation would most directly affect _______

 DNA replication

 Protein length and folding

 Chromatin structure

 mRNA transcription rate

3. The biological significance of RNA splicing lies in _______

 Enhancing genetic diversity and proteome complexity

 Increasing DNA stability

 Reducing RNA length only

 Preventing transcription

4. ___________ is a regulatory DNA sequence that increases the rate of transcription when bound by activator proteins

 Silencer

 Promoter

 Enhancer

 Operator

5. How does a point mutation in a coding region most directly affect gene expression at the level of translation?

 It may change a codon, potentially altering the amino acid sequence of the resulting protein

 It always prevents transcription, so no mRNA is produced

 It only affects introns and never influences protein sequence

 It guarantees that the protein will be completely absent in the cell

6. In eukaryotic cells, where does translation primarily occur, and which complex performs this process?

 In the mitochondria on DNA polymerase complexes

 In the Golgi apparatus on vesicle-coating proteins

 In the cytoplasm on ribosomes

 In the nucleus on RNA polymerase complexes

7. A frameshift mutation differs from a missense mutation because it _______

 Alters the reading frame downstream of the mutation

 Changes only a single amino acid

 Only affects promoter regions

 Does not affect the resulting protein

8. Exons are defined as _______

 Non-functional RNA segments

 Sequences removed during RNA processing

 Coding regions retained in mature mRNA

 DNA repair elements

9. Which statement best explains how gene regulation can affect gene expression without altering the DNA sequence?

 The central dogma implies gene expression cannot be modulated after transcription

 Regulatory proteins and epigenetic modifications control when and how strongly a gene is transcribed

 Only mutations in coding regions can change gene expression patterns

 Translation always proceeds at a constant rate regardless of cellular conditions

10. If histone acetyltransferase (HAT) activity increases, gene expression is expected to _______

 Increase due to chromatin relaxation

 Remain unchanged

 Decrease due to chromatin condensation

 Stop completely

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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.