This quiz works best with JavaScript enabled. Home > Agriculture > Biology > Molecular > Molecular Biology – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 1 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which best describes respiration? A) A cell process that converts carbon dioxide into energy. B) A plant process where chlorophyll produces sugar energy. C) A cell process that releases energy from food. D) A plant process where sunlight is converted into energy. Show Answer Correct Answer: C) A cell process that releases energy from food. 2. Transcription starts with ..... and results in ..... A) MRNA / DNA. B) MRNA / Amino Acid Chain. C) DNA / mRNA. D) MRNA / tRNA. Show Answer Correct Answer: C) DNA / mRNA. 3. HISTORY: Discovered Bacterial Transformation A) Fredrick Griffeth. B) Martha Chase. C) Rosalind Franklin. D) Erwin Chargaff. 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) 6. C) 2. D) 3. Show Answer Correct Answer: C) 2. 5. Which ratio is constant for DNA? A) A + C / U + G. B) A + U / G + C. C) A + T / G + C. D) A + G / T + C. Show Answer Correct Answer: D) 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) They contain the element nitrogen. B) They are made of amino acids which are amphoteric. C) Each individual has a unique proteome. D) They can be folded into different three dimensional shapes. Show Answer Correct Answer: D) 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) Adenine. B) Cytosine. C) Uracil. D) Thymine. Show Answer Correct Answer: A) 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) Oxygen. B) Alcohol. C) Carbon dioxide. D) Glucose. Show Answer Correct Answer: D) Glucose. 15. DNA can only be copied in the: A) 3' to 5' direction. B) 5' to 3' direction. C) Reverse order. D) Eukaryotic cell. 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) 20 %. B) 40 %. C) 70 %. D) 30 %. Show Answer Correct Answer: A) 20 %. 17. 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. 18. Unbranched starch in helix form A) Glycogen. B) Cellulose. C) Amylose. D) Amylopectin. Show Answer Correct Answer: C) Amylose. 19. What bonds hold DNA bases together? A) Nitrogen bonds. B) Carbon bonds. C) Phosphorus bonds. D) Hydrogen bonds. Show Answer Correct Answer: D) Hydrogen bonds. 20. What is the name for this RNA --> proteins? A) Translation. B) Transcription. C) Replication. D) None of these. Show Answer Correct Answer: A) Translation. 21. What organelle surrounds and supports plant cells? A) Cell Membrane. B) Cell Wall. C) Nucleus. D) Golgi Complex. Show Answer Correct Answer: B) Cell Wall. 22. Carbohydrates are broken down into smaller molecules for what purpose? A) To provide energy. B) To form cell membranes. C) To transmit genetic information. D) To form muscle. Show Answer Correct Answer: A) To provide energy. 23. REPLICATION:DNA Replication is: A) Is Semi-conservative. B) Makes a protein. C) Has no hydrogen Bonds. D) Is a double helix. Show Answer Correct Answer: A) Is Semi-conservative. 24. Under ..... light, a plant would grow well because chlorophyll would ..... the photons. A) Green, absorb. B) Red, absorb. C) Green, reflect. D) Red, reflect. Show Answer Correct Answer: B) Red, absorb. 25. The codon chart contains what information? A) Amino acids. B) Protein chains. C) Sugars. D) DNA sequences. Show Answer Correct Answer: A) Amino acids. 26. The two polynucleotide chains of DNA are held together by bonds between A) Amino acids. B) Sugars and phosphates. C) Complementary bases. D) Adenine and uracil. Show Answer Correct Answer: C) Complementary bases. 27. Cytosine always pairs with A) Thymine. B) Guanine. C) Adenine. D) Uracil. Show Answer Correct Answer: B) Guanine. 28. Further processing of eukaryotic mRNA includes A) Splicing and tailing. B) Caping and tailing. C) Caping, tailing and splicing. D) Splicing only. Show Answer Correct Answer: C) Caping, tailing and splicing. 29. The site where transcription begins A) In nucleus. B) Rho factor. C) Promoter. D) Template. Show Answer Correct Answer: C) Promoter. 30. How to start or initiate the lac operon function? A) Sucrose not available, pentose is available. B) Pentose not available, sucrose is available. C) Glucose not available, lactose is available. D) Glucose is available, lactose not available. Show Answer Correct Answer: C) Glucose not available, lactose is available. Next →Related QuizzesBiology QuizzesAgriculture QuizzesMolecular Biology Quiz 2Molecular Biology Quiz 3Molecular Biology Quiz 4Molecular Biology Quiz 5Molecular Biology Quiz 6Molecular Biology Quiz 7Molecular Biology Quiz 8Molecular Biology Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books