This quiz works best with JavaScript enabled. Home > Biology > Molecular Biology – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 1 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which best describes respiration? A) A cell process that releases energy from food. B) A cell process that converts carbon dioxide into energy. C) A plant process where sunlight is converted into energy. D) A plant process where chlorophyll produces sugar energy. Show Answer Correct Answer: A) A cell process that releases energy from food. 2. Transcription starts with ..... and results in ..... A) DNA / mRNA. B) MRNA / DNA. C) MRNA / tRNA. D) MRNA / Amino Acid Chain. Show Answer Correct Answer: A) DNA / mRNA. 3. HISTORY: Discovered Bacterial Transformation A) Fredrick Griffeth. B) Erwin Chargaff. C) Rosalind Franklin. D) Martha Chase. Show Answer Correct Answer: A) Fredrick Griffeth. 4. If the DNA molecule with 6 paired nitrogen bases were transcribed, how many codons would the resulting mRNA molecule contain? A) 1. B) 2. C) 3. D) 6. Show Answer Correct Answer: B) 2. 5. Which ratio is constant for DNA? A) A + G / T + C. B) A + T / G + C. C) A + C / U + G. D) A + U / G + C. Show Answer Correct Answer: A) A + G / T + C. 6. How does the enzyme that makes RNA know where to start transcribing the DNA? A) The enzyme starts at a promoter, which is a region of DNA that has specific base sequences. B) The enzyme starts at a start codon. C) The enzyme does not know where to start it just starts at a random point on the DNA. D) The enzyme uses the tRNA and rRNA to determine the spot on the DNA where the transcribing begins. Show Answer Correct Answer: A) The enzyme starts at a promoter, which is a region of DNA that has specific base sequences. 7. Proteins are polymers with a large range of structures and functions because A) Each individual has a unique proteome. B) They can be folded into different three dimensional shapes. C) They are made of amino acids which are amphoteric. D) They contain the element nitrogen. Show Answer Correct Answer: B) They can be folded into different three dimensional shapes. 8. Conservative transposons refers to the movement of ..... elements A) Large. B) Small. C) Medium. D) None of above. Show Answer Correct Answer: A) Large. 9. Starch and water molecules in potato cells are stored in what organelle? A) Mitochondria. B) Nucleus. C) Cell wall. D) Vacuole. Show Answer Correct Answer: D) Vacuole. 10. Aerobic respiration requires ..... A) Water. B) Oxygen. C) Glucose. D) None of above. Show Answer Correct Answer: B) Oxygen. 11. Which best describes how a diet with low carbohydrate intake would affect glucose levels and cellular respiration? A) Glucose levels would decrease, and cellular respiration would decrease. B) Glucose levels would increase, and cellular respiration would decrease. C) Glucose levels would increase, and cellular respiration would increase. D) Glucose levels would decrease, and cellular respiration would increase. Show Answer Correct Answer: A) Glucose levels would decrease, and cellular respiration would decrease. 12. Identify the purine base of nucleic acids in the following A) Cytosine. B) Thymine. C) Uracil. D) Adenine. Show Answer Correct Answer: D) Adenine. 13. What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized? A) DNA polymerase can join new nucleotides to the 3' end of the preexisting strand. B) Helicases and single-strand binding proteins work at the 5' end. C) The origins of replication occur only at the 5' end. D) DNA ligase works only in the 3' to 5' direction. Show Answer Correct Answer: A) DNA polymerase can join new nucleotides to the 3' end of the preexisting strand. 14. Which molecule is broken down during cellular respiration to produce energy for plants and animals? A) Glucose. B) Alcohol. C) Oxygen. D) Carbon dioxide. Show Answer Correct Answer: A) Glucose. 15. DNA can only be copied in the: A) Eukaryotic cell. B) 5' to 3' direction. C) 3' to 5' direction. D) Reverse order. Show Answer Correct Answer: B) 5' to 3' direction. 16. The percentage of thymine in the DNA of an organism is approximately 30 %. What is the percentage of guanine? A) 70 %. B) 30 %. C) 40 %. D) 20 %. Show Answer Correct Answer: D) 20 %. 17. An enzyme is a A) Carbohydrate. B) Protein. C) Lipid. D) Nucleic acid. Show Answer Correct Answer: B) Protein. 18. Which of the following help(s) to hold the DNA strands apart while they are being replicated? A) RNA primase. B) Single-strand binding proteins. C) DNA polymerase I. D) DNA ligase. Show Answer Correct Answer: B) Single-strand binding proteins. 19. Unbranched starch in helix form A) Amylopectin. B) Glycogen. C) Amylose. D) Cellulose. Show Answer Correct Answer: C) Amylose. 20. What bonds hold DNA bases together? A) Nitrogen bonds. B) Hydrogen bonds. C) Phosphorus bonds. D) Carbon bonds. Show Answer Correct Answer: B) Hydrogen bonds. Next →Related QuizzesMolecular Biology Quiz 2Molecular Biology Quiz 3Molecular Biology Quiz 4Molecular Biology Quiz 5Molecular Biology Quiz 6Molecular Biology Quiz 7Molecular Biology Quiz 8Molecular Biology Quiz 9Molecular Biology Quiz 10Molecular Biology Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books