Q1. Which of the following occurs first in eukaryotic gene expression?A. SplicingB. PolyadenylationC. TranscriptionD. Translation
Q2. Which of the following statements about ribosomes is incorrect?A. Ribosomes are composed of rRNA and proteins.B. Ribosomes function in protein synthesis.C. Ribosomes are present in both prokaryotic and eukaryotic cells.D. Ribosomes are membrane-bound organelles.
Q3. Which of the following is correct about RNA polymerase in eukaryotic transcription?A. RNA polymerase I transcribes mRNA.B. RNA polymerase II synthesizes rRNA.C. RNA polymerase III transcribes tRNA.D. RNA polymerase requires a primer to initiate transcription.
Q4. Which of the following statements about aminoacyl-tRNA synthetase is correct?A. It removes introns from mRNA.B. It catalyzes the attachment of amino acids to tRNA.C. It helps unwind DNA during replication.D. It adds a poly-A tail to mRNA.
Q5. Which of the following is NOT a function of RNA polymerase?A. Synthesizing RNA from a DNA templateB. Unwinding DNA strandsC. Catalyzing peptide bond formationD. Initiating transcription at the promoter
Q6. Which of the following elements regulates the expression of genes by binding to specific sequences in DNA?A. EnhancersB. IntronsC. ExonsD. Poly-A tail
Q7. Which feature of the genetic code ensures that an amino acid can be coded by more than one codon?A. UniversalityB. Non-overlapping natureC. DegeneracyD. Specificity
Q8. Which of the following statements about the genetic code is incorrect?A. The genetic code is universal.B. Each codon codes for only one amino acid.C. The genetic code is overlapping.D. The genetic code is degenerate.
Q9. Which of the following statements about the genetic code is true?A. Each amino acid is coded by only one codonB. It is non-overlapping and degenerateC. The same codon codes for different amino acidsD. It has only one stop codon
Q10. Which of the following best describes the function of a transcriptional repressor?A. Enhances gene expressionB. Prevents transcription by binding to the operatorC. Splices introns from pre-mRNAD. Facilitates ribosome attachment to mRNA