1. The functional outcome of RNA splicing is the formation of _______

 Untranslated RNA fragments

 Mature mRNA with joined exons

 DNA–RNA hybrids

 Double-stranded RNA

2. A newly synthesized polypeptide becomes functionally active after _______

 RNA splicing

 Transcription of the gene

 Folding into its native three-dimensional structure

 DNA replication

3. Which of the following best describes a codon in the context of translation?

 A three–amino acid sequence in a protein that signals termination

 A region of DNA where RNA polymerase binds to initiate transcription

 A sequence of three nucleotides in mRNA that specifies an amino acid or a stop signal

 A loop structure in tRNA that carries an amino acid

4. Failure of proper RNA splicing would most directly affect _______

 Protein sequence and functional integrity

 Lipid metabolism pathways

 Chromosome segregation during mitosis

 DNA replication accuracy

5. The junctions where introns are removed during RNA splicing are recognized by _______

 DNA helicase activity

 Ribosomal scanning mechanisms

 Random enzymatic cleavage

 Specific conserved nucleotide sequences at splice sites

6. Translation elongation requires _______

 ATP/GTP as energy sources

 Helicase

 DNA ligase

 RNA polymerase

7. The enzyme primarily responsible for synthesizing mRNA from a DNA template during transcription is _______

 DNA polymerase

 RNA polymerase

 DNA ligase

 Helicase

8. RNA splicing in eukaryotes occurs primarily during _______

 Transcriptional elongation

 Post-transcriptional processing

 Translation

 DNA replication

9. The molecular machinery responsible for RNA splicing is the _______

 Spliceosome

 Ribosome

 DNA polymerase complex

 Proteasome

10. The spliceosome is composed primarily of _______

 RNA and proteins (snRNPs)

 Histones and DNA

 DNA and lipids

 Carbohydrates and enzymes

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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.