This quiz works best with JavaScript enabled. Home > Agriculture > Biology > Molecular > Molecular Biology – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 3 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An insertion sequence or IS element is a short ..... sequence moves from one location to another A) TRNA. B) RNA. C) DNA. D) MRNA. Show Answer Correct Answer: C) DNA. 2. DNA has the following bases EXCEPT: A) Uracil. B) Cytosine. C) Adenine. D) Guanine. Show Answer Correct Answer: A) Uracil. 3. What are Okazaki fragments? A) Pieces of new DNA forming on the lagging strand. B) Pieces of new DNA forming on that leading strand. C) Pieces of DNA that are discarded. D) Pieces of RNA that serve as primers. Show Answer Correct Answer: A) Pieces of new DNA forming on the lagging strand. 4. ..... fills the single stranded gaps in mechanism of bacterial IS element transpositions A) RNA polymerase. B) RNA ligase. C) DNA ligase. D) DNA polymerase. Show Answer Correct Answer: D) DNA polymerase. 5. What is a difference between the sense and antisense strands of DNA? A) Nucleotides are linked to the sense strand by hydrogen bonding during transcription, but not to the antisense strand. B) The sense strand has the same base sequence as tRNA, but the antisense strand does not. C) Nucleotides are linked to the antisense strand by hydrogen bonding during transcription, but not to the sense strand. D) The antisense strand has the same base sequence as mRNA but the sense strand does not. Show Answer Correct Answer: C) Nucleotides are linked to the antisense strand by hydrogen bonding during transcription, but not to the sense strand. 6. Which best describes the process by which the energy from the sun is used to create glucose (sugar) molecules? A) Photosynthesis. B) Cellular respiration. C) Chemosynthesis. D) Fermentation. Show Answer Correct Answer: A) Photosynthesis. 7. Which food provides the most energy for the body in the shortest amount of time? A) Meat. B) Fruit. C) Potato. D) Milk. Show Answer Correct Answer: B) Fruit. 8. Why is the action spectrum for photosynthesis similar to the absorption spectra of photosynthetic pigments? A) Only wavelengths of light absorbed by pigments can be used in photosynthesis. B) The amount of energy absorbed by photosynthetic pigments is equal to the activation energy for photosynthesis. C) Photosynthetic pigments have the same optimum temperature as the enzymes used in photosynthesis. D) Plants absorb the same photosynthetic pigments for use in photosynthesis. Show Answer Correct Answer: A) Only wavelengths of light absorbed by pigments can be used in photosynthesis. 9. The enzyme during transcription moves in ..... direction and construction of mRNA is in ..... direction. A) 3' to 5', 3' to 5'. B) 3' to 5', 5' to 3'. C) 5' to 3', 5' to 3'. D) 5' to 3' and 3' to 5'. Show Answer Correct Answer: B) 3' to 5', 5' to 3'. 10. Where in the cell does translation occur? A) Always the cytoplasm. B) Always the nucleus. C) In the cytoplasm in eukaryotes and the nucleus in prokaryotes. D) In the cytoplasm in prokaryotes and the nucleus in eukaryotes. Show Answer Correct Answer: A) Always the cytoplasm. 11. What charge is DNA? A) Positive. B) Negative. C) Neutral. D) None of above. Show Answer Correct Answer: B) Negative. 12. A mutation can occur if a base pair is ....., deleted, or substituted for another. A) Modified. B) Added. C) Transferred. D) None of above. Show Answer Correct Answer: B) Added. 13. A polymer of alpha-D-glucose found in plants has mostly 1, 4 linkages and some 1, 6 linkages. Which molecule fits this description? A) Amylopectin. B) Amylose. C) Glycogen. D) Cellulose. Show Answer Correct Answer: A) Amylopectin. 14. Where is replication located? A) Ribosome. B) Nucleus. C) Nucleolus. D) Cytoplasm. Show Answer Correct Answer: B) Nucleus. 15. Crystal is trying to increase the protein in her diet. Which foods will best satisfy this nutritional need? A) Peas, fish, milk, and beans. B) Apples, carrots, juice, and rice. C) Kiwi, lettuce, tea, and strawberries. D) Watermelon, spinach, coffee, and pasta. Show Answer Correct Answer: A) Peas, fish, milk, and beans. 16. Which biomolecule is your main source of energy? A) Nucleic Acid. B) Carbohydrate. C) Protein. D) Lipid. Show Answer Correct Answer: B) Carbohydrate. 17. A template strand of DNA is 3' TAGGCATTGCA 5'.What is the complementary DNA strand that is created from this template during replication? A) 5' ATCCGTAACGT 3'. B) 5' TAGGCATTGCA 3'. C) 5' TGCAATGCCTA 3'. D) 5' AUCCGUAACGU 3'. Show Answer Correct Answer: A) 5' ATCCGTAACGT 3'. 18. Bacteria protect themselves from viruses by fragmenting viral DNA with A) Exonuclease. B) Gyrase. C) Ligase. D) Endonuclease. Show Answer Correct Answer: D) Endonuclease. 19. Some yeast genes can be replaced by human genes that then continue to produce the same human proteins in the yeast cells. Which statement helps to explain this evidence? A) The DNA of yeast and humans is identical. B) Yeast and humans have the same number of chromosomes. C) The genetic code is universal. D) Yeast and humans are both eukaryotes. Show Answer Correct Answer: C) The genetic code is universal. 20. HISTORY: Two time Nobel Prize winner who suggested a structure for DNA - but got it completely wrong..... A) Linnus Pauling. B) Rosalind Franklin. C) Francis Crick. D) James Watson. Show Answer Correct Answer: A) Linnus Pauling. 21. In bacteria, transposons jump from A) Plasmid RNA to chromosomal DNA. B) Plasmid DNA to chromosomal RNA. C) Chromosomal RNA to plasmid DNA. D) Chromosomal DNA to plasmid DNA. Show Answer Correct Answer: D) Chromosomal DNA to plasmid DNA. 22. Because some amino acids can be coded for by multiple codons, this type of mutation is possible. A) Degenerate Mutation. B) Silent Mutation. C) Nonsense Mutation. D) Missense Mutation. Show Answer Correct Answer: B) Silent Mutation. 23. If a DNA molecule is 18% Guanine which of the following is correct A) 32% cytosine, 32% adenine, 18% thymine. B) 32% cytosine, 18% adenine, 32% thymine. C) 18% cytosine, 32% adenine, 32% thymine. D) 18% cytosine, 64% adenine, 64% thymine. Show Answer Correct Answer: C) 18% cytosine, 32% adenine, 32% thymine. 24. Which molecule carries the protein code from the nucleus to the ribosome? A) DNA. B) TRNA. C) MRNA. D) RRNA. Show Answer Correct Answer: C) MRNA. 25. In cellular respiration, approximately 38% of the energy contained in glucose is released for an organism to use carrying out life processes. Which best explains what happens to the remaining 62% of the energy contained in glucose? A) The energy is used to start the process of cellular respiration when more glucose is consumed by the organism. B) The energy is used to convert leftover glucose into protein to be stored by the cells of the organism. C) The energy is stored by the cells and released later when needed by the organim. D) The energy is converted to thermal energy, which provides heat to the organism. Show Answer Correct Answer: D) The energy is converted to thermal energy, which provides heat to the organism. 26. Which would NOT be a part of production of lactose-free products? A) Hydrolysis of lactase. B) Adding digestive enzyme to dairy products. C) Filter milk over enzyme immobilized in mesh. D) Hydrolysis of lactose. Show Answer Correct Answer: A) Hydrolysis of lactase. 27. What process forms triglycerides? A) Hydrolysis. B) Glycolysis. C) Evaporation. D) Condensation. Show Answer Correct Answer: D) Condensation. 28. What is the function of telomeres on a DNA strand? A) They are used as a recognition site for DNA helicase to bond & begin "unzipping" the strand for replication. B) They bond the Okazaki fragments together forming a continuous replication of DNA on the lagging strand. C) When cell continually replicate, the DNA gets shorter so by adding telomeres to the ends of DNA, they extend the life of a cell. D) They help untangle the DNA strand prior to DNA helicase's arrival to unzip the DNA strand, readying it for replication. Show Answer Correct Answer: C) When cell continually replicate, the DNA gets shorter so by adding telomeres to the ends of DNA, they extend the life of a cell. 29. The enzyme catalase hydrolyzes H2O2 (hydrogen peroxide) into what products? A) H2O2 + O2. B) H2O + O2. C) CO2 + O2. D) NH3 + O2. Show Answer Correct Answer: B) H2O + O2. 30. The addition of nucleotides to a growing mRNA strand is called A) Mutagen. B) Frameshift. C) Elongation. D) Splicing. Show Answer Correct Answer: C) Elongation. ← PreviousNext →Related QuizzesBiology QuizzesAgriculture QuizzesMolecular Biology Quiz 1Molecular Biology Quiz 2Molecular 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