1. The start codon in most organisms is _______

 UGA

 UAA

 UAG

 AUG

2. The role of transfer RNA (tRNA) in translation is to _______

 Synthesize messenger RNA (mRNA)

 Carry genetic information from DNA

 Degrade misfolded proteins

 Deliver specific amino acids to the ribosome

3. Proteins influence phenotype primarily through their _________________

 Role in DNA replication

 Participation in RNA degradation only

 Structural and functional roles in cells

 Involvement in chromosome segregation

4. Hemoglobin is an example of a protein involved in _______

 Protein synthesis machinery

 Cell signaling pathways

 Oxygen transport in blood

 DNA repair mechanisms

5. Protein folding is primarily determined by _______

 Amino acid sequence

 DNA structure

 mRNA sequence

 Ribosome size

6. Regulation of gene expression at the chromatin level involves _______

 Protein folding by chaperones

 Histone modification and chromatin remodeling

 DNA replication processes

 Translation of mRNA into proteins

7. Post-translational modification of proteins includes _______

 DNA replication during cell division

 Transcription of DNA into RNA

 Phosphorylation of amino acid residues

 Translation of mRNA into polypeptides

8. Termination of translation occurs when _______

 Start codon is reached

 Stop codon is encountered

 tRNA is absent

 Ribosome detaches randomly

9. Which of the following is NOT a stage of gene expression in eukaryotes?

 DNA replication

 RNA processing

 Transcription

 Translation

10. The genetic code is described as degenerate because _______

 It varies widely among organisms

 It lacks specificity in translation

 Multiple codons encode the same amino acid

 It is highly error-prone

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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.