This quiz works best with JavaScript enabled. Home > Agriculture > Biology > Molecular > Molecular Biology – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 9 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The base sequence of a fragment of DNA is:ACC GTG CAG GATWhat is the base sequence on the messenger RNA (mRNA) molecule transcribed from it? A) TGG CUC GTC CTU. B) UGG CAC GUC CUA. C) UGG CTC GUC CUT. D) TGG CAC GTC CTA. Show Answer Correct Answer: B) UGG CAC GUC CUA. 2. What is the composition of nucleoside? A) A base + a sugar + phosphate. B) A base + a sugar. C) A sugar + a phosphate. D) A base + a phosphate. Show Answer Correct Answer: B) A base + a sugar. 3. PCR technique was invented by A) Karry Mullis. B) Sanger. C) Cohn. D) Boyer. Show Answer Correct Answer: A) Karry Mullis. 4. STRUCTURE: Which 2 molecules form the sides of the DNA ladder? A) Deoxyribose and adenine. B) Deoxyribose and a hydrogen bond. C) Sugar and the nucleus. D) Deoxyribose (sugar) and phosphate. Show Answer Correct Answer: D) Deoxyribose (sugar) and phosphate. 5. Crick and Watson elucidated the structure of DNA using which of the following? A) Model making. B) Gel Electrophoresis. C) X-ray crystallography. D) Condensation reactions. Show Answer Correct Answer: A) Model making. 6. In prokaryotes, DNA molecules are located in the A) Histones. B) Nucleus. C) Ribosomes. D) Cytoplasm. Show Answer Correct Answer: D) Cytoplasm. 7. A gene gives the instructions for protein synthesis. Which type of molecule is responsible for "reading" the instructions and then creating the protein? A) ATP. B) DDT. C) DNA. D) RNA. Show Answer Correct Answer: D) RNA. 8. The following strand of DNA is transcribed:51 TGA ACT GCT 31What will be the second codon of the mRNA formed from transcription? A) AGU. B) AGT. C) UGA. D) TGA. Show Answer Correct Answer: A) AGU. 9. A frameshift mutation could result from A) A base insertion only. B) A base deletion only. C) Either an insertion or a deletion of a base. D) A base substitution only. Show Answer Correct Answer: C) Either an insertion or a deletion of a base. 10. Which best explains why organisms need food? A) Food is the source of energy required for growth and repair of tissues. B) Food provides the raw materials for producers to produce more food. C) Food is the source of water needed to hydrate the surface of cells. D) Food provides the oxygen necessary for plant and animal survival. Show Answer Correct Answer: A) Food is the source of energy required for growth and repair of tissues. 11. In his work with pneumonia-causing bacteria & mice, Griffith found that A) Some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic. B) Heat-killed pathogenic cells caused pneumonia. C) The protein coat from pathogenic cells was able to transform nonpathogenic cells. D) The polysaccharide coat of bacteria caused pneumonia. Show Answer Correct Answer: A) Some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic. 12. Which pair of nitrogen bases are correctly matched? A) Adenine with thymine. B) Cytosine with thymine. C) Adenine with cytosine. D) Guanine with adenine. Show Answer Correct Answer: A) Adenine with thymine. 13. The artificial production of which substance (normally produced by living organisms) helped disprove vitalism? A) Urine. B) Ammonia. C) Uric acid. D) Urea. Show Answer Correct Answer: D) Urea. 14. The enzyme that unzips DNA during transcription A) DNA polymeras. B) RNA polymerase. C) Ligase. D) RNA primase. Show Answer Correct Answer: B) RNA polymerase. 15. If one strand of DNA is TTGCA, what is the sequence of the other complementary DNA strand? A) AACGT. B) TTGCA. C) AACGU. D) UUCGT. Show Answer Correct Answer: A) AACGT. 16. Which characteristic do all single-celled and multicellular organisms have in common? A) They release carbon dioxide as a waste product. B) They require oxygen for the production of glucose and water. C) They take in nutrients and break down the nutrients to release energy. D) They consume other organisms to obtain energy from food. Show Answer Correct Answer: C) They take in nutrients and break down the nutrients to release energy. 17. Which macromolecule causes newly formed cells to specialize? A) Steroids. B) Nucleic acids. C) Lipids. D) Carbohydrates. Show Answer Correct Answer: B) Nucleic acids. 18. The greatest amount of ATP is produced during A) Glycolysis. B) Aerobic respiration. C) Anaerobic respiration. D) Fermentation. Show Answer Correct Answer: B) Aerobic respiration. 19. If carbon dioxide is completely removed from a plant's environment, what would you expect to happen to the plant's production of glucose (rate of photosynthesis)? A) The rate of sugar production will decrease . B) Fewer sugars will be produced at first, but then the plant will recover. C) Sugar production will likely increase. D) Sugars will not be produced. Show Answer Correct Answer: D) Sugars will not be produced. 20. In RNA, the nitrogen base..... replaces ..... that was present in DNA. A) C, G (cytosine, guanine). B) U, A (uracil, adenine). C) A, U (adenine, uracil). D) U, T (uracil, thymine). Show Answer Correct Answer: D) U, T (uracil, thymine). 21. Pick the type of food that would be a good choice for a healthy snack? A) Potato chips. B) Candy bar. C) Nuts. D) Soda. Show Answer Correct Answer: C) Nuts. 22. Where does photosynthesis take place in the plant cell? A) Nucleus. B) Chloroplast. C) Cytoplasm. D) Mitochondria. Show Answer Correct Answer: B) Chloroplast. 23. CH3 is a ..... group A) Methyl. B) Amine. C) Hydroxyl. D) Carboxyl. Show Answer Correct Answer: A) Methyl. 24. Where does transcription occur in eukaryotic cells? A) Ribosome. B) Rough E.R. C) Cytoplasm. D) Nucleus. Show Answer Correct Answer: D) Nucleus. 25. 00512 mL is equivalent to ..... $\mu$L. A) $0.00512 \times 10^6 $. B) $0.0512 \times 10^3$. C) 5.12. D) 51.2. Show Answer Correct Answer: C) 5.12. 26. The second step of protein synthesis is best summarized by which of the following? A) Nucleus to ribosome. B) MRNA to DNA. C) DNA to protein. D) MRNA to protein. Show Answer Correct Answer: D) MRNA to protein. 27. Personal medical records become more available and more detailed because of biotechnological research. Based on this information, which is a major concern to the public? A) Overdiagnosis of certain medical conditions. B) Transmission of more diseases. C) An increase in under qualified doctors. D) Inappropriate use of medical information. Show Answer Correct Answer: D) Inappropriate use of medical information. 28. The individuality of an organism is determined by the A) Number of nitrogenous bases in a codon. B) Sequence of nitrogenous bases in deoxyribonucleic acid. C) Position of the ribosomes on the endoplasmic resticulum. D) Number of amino acids in a cell. Show Answer Correct Answer: B) Sequence of nitrogenous bases in deoxyribonucleic acid. 29. When an organism oxidizes food, some of the energy is lost. Which explains this loss of energy? A) Energy is stored for later use. B) Energy is converted to waste. C) Energy is converted to chemical compounds. D) Energy is lost or released as heat. Show Answer Correct Answer: D) Energy is lost or released as heat. 30. What is a codon? A) A sequence of nucleotides on mRNA that corresponds to an amino acid. B) A sequence of nucleotides on rRNA that corresponds to an amino acid. C) A sequence of nucleotides on tRNA that corresponds to an amino acid. D) A sequence of nucleotides on DNA that corresponds to an amino acid. Show Answer Correct Answer: A) A sequence of nucleotides on mRNA that corresponds to an amino acid. ← PreviousNext →Related QuizzesBiology QuizzesAgriculture QuizzesMolecular Biology Quiz 1Molecular Biology Quiz 2Molecular Biology Quiz 3Molecular Biology Quiz 4Molecular Biology Quiz 5Molecular Biology Quiz 6Molecular Biology Quiz 7Molecular Biology Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books