Unit-V Biomolecular StructureBy abdulslambsn@gmail.com / June 14, 2025 Quiz 5 | Unit-V Biomolecular Structure Your Good Name: Your College Name: Morning/Evening/Private: Email: 1. What is the monomer of proteins? Fatty acids Amino acids Monosaccharides Nucleotides None 2. Which of the following statements about DNA is FALSE? It contains the sugar deoxyribose It is single-stranded in humans It stores genetic information Its strands are antiparallel None 3. Which RNA carries amino acids to the ribosome? rRNA tRNA mRNA snRNA None 4. The base pairing in DNA is: A-G, C-T A-U, C-G A-T, C-G A-C, T-G None 5. Which component is present in RNA but not in DNA? Thymine Ribose Deoxyribose Double helix None 6. The 3D structure of a protein is mostly determined by: Enzymes mRNA sequence Amino acid sequence Phospholipids None 7. Which of the following is NOT a nucleic acid? DNA RNA ATP Collagen None 8. What is the direction of synthesis of a polypeptide chain? 5' to 3' C-terminal to N-terminal N-terminal to C-terminal 3' to 5' None 9. Which bond forms between two amino acids? Glycosidic bond Hydrogen bond Peptide bond Phosphodiester bond None 10. Which of the following bonds stabilizes the secondary structure of proteins? Disulfide bonds Hydrogen bonds Peptide bonds Ionic bonds None 11. Which level of protein structure is lost first during denaturation? Primary Secondary Tertiary Quaternary None 12. Which of the following amino acids contains sulfur? Alanine Glycine Cysteine Tyrosine None 13. Which of the following contains codons? tRNA rRNA mRNA DNA only None 14. In eukaryotes, which RNA is most abundant? tRNA mRNA rRNA snRNA None 15. Which enzyme is responsible for joining Okazaki fragments? DNA helicase DNA ligase DNA polymerase RNA primase None 16. DNA replication occurs in which cell phase? G1 S phase G2 M phase None 17. Why is RNA more reactive than DNA? Double-stranded nature Lacks phosphate Presence of uracil Ribose has hydroxyl group at 2’ position None 18. A DNA molecule with 30% adenine will have how much cytosine? 20% 30% 40% 70% None 19. Which base is found only in RNA? Thymine Cytosine Uracil Adenine None 20. Which best explains why denatured enzymes lose function? DNA mutation Substrate absence Loss of active site shape Broken phosphodiester bonds None 21. Which level of protein structure is directly encoded by DNA? Primary Secondary Tertiary Quaternary None 22. Which of the following is a double-stranded molecule? mRNA DNA tRNA rRNA None 23. Which structure in RNA allows it to fold into functional shapes? Phosphate backbone Antiparallel strands Base pairing N-terminal domains None 24. The tertiary structure of a protein is stabilized by all EXCEPT: Ionic bonds Disulfide bonds Hydrophobic interactions Phosphodiester bonds None 25. How many nitrogenous bases are there in DNA? 2 3 4 5 None 1 out of 3 Thanks For Submitting Your Quiz !!