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• 5. Which of the following statements is   INCORRECT   for retroviruses?(A) They are enveloped RNA vi
• 6. Which of the following parts in an antibody does   NOT   contact with in antigen?(A) heavy chain(
• 7.Which of the following solutions is the most commonly used reagent to wash cells and retain the ce
• 8. An enzyme that recognizes specific palindromic sequence and digests double-stranded DNA is called
• 9. Which of the following techniques does   NOT   involve the use of antibodies?(A) ELISA(B) Flow cy
• 10. Which of the followings is utilized for studying DNA-protein interaction?(A) Pulse-field gel ele
• 11. Which of the following motifs is commonly found in many DNA-binding proteins?(A) inverted-repeat
• 12. Endotoxin is also known as(A) Peptidoglycan(B) Flagella(C) Teichoic acid(D) Lipopolysaccharide
• 13. Transduction is mediated by(A) Transposon(B) Plasmid(C) Bacterial phage(D) CRISPR-Cas system
• 14. In a DNA double helix the bases are held together by hydrogen bonds. These hydrogen bonds are(A)
• 15. Please check which one of the following mechanisms is wrongly paired with its location ofoccurre
• 16. Which of the followings serves as the first primer in RT-PCR for eukaryotic RNA?(A) Oligo A(B) O
• 17. What changes occur in the chromosome to make it inactive?(A) Methylation(B) Glycosylation(C) Ace
• 18. Monoclonal antibodies are produced by what method?(A) Recombinant DNA technology(B) Transformati
• 19. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) belong to which kind of virus?(A) s
• 20. During the expression process of a protein from its gene, what is the role of the promoter seque
• 21. Which of the following protein modifications is critically involved in the intracellular signali
• 22. Restriction enzymes are endonuclease that can recognize and digest(A) single-stranded RNA(B) sin
• 23. Which of the followings is the basis of the 'Modema COVID-19" vaccine?(A) Live attenua
• 24. In what direction is RNA transcribed?(A) 3' to 5'(B) 5' to 3'(C) N to C term
• 25. What is the purpose of RNA editing in different cells/tissues?(A) Increase effective genctic div
• 26. During DNA replication, the primers used for leading and lagging strand initiation must be remov
• 27. Which of the followings is an example of a silent mutation?(A) UAC to UAG(B) UCC to UCA(C) AAA t
• 28. There are varieties of vaccines developed and available for preventing COVID-19 infection   EXCE
• 29. Which of the following sequences is   NOT   found in pre-mRNA?(A) Exon(B) Intron(C) Promoter(D)