This quiz works best with JavaScript enabled. Home > Agriculture > Biology > Molecular > Molecular Biology – Quiz 26 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 26 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The separation of the two single strands of DNA creates a 'Y' shape? A) Enzyme. B) Unzip. C) A replication fork. D) None of above. Show Answer Correct Answer: C) A replication fork. 2. According to the induced fit model, as a substrate approaches an enzyme, it induces a ..... in the active site. A) Conformational change. B) Chemical change. C) Color change. D) None of above. Show Answer Correct Answer: A) Conformational change. 3. Which part of an amino acid varies? A) Carbonyl. B) C-C-N backbone. C) Hydroxyl. D) R-group. Show Answer Correct Answer: D) R-group. 4. Which is transported in the blood in lipoprotein droplets? A) Cholesterol. B) Glucose. C) Amino acids. D) Sodium ions. Show Answer Correct Answer: A) Cholesterol. 5. STRUCTURE: What Nitrogenous Base does RNA contain that DNA does not? A) Thymine. B) Adenine. C) Love. D) Uracil. Show Answer Correct Answer: D) Uracil. 6. Which best explains why some fats are recommended as part of a healthy diet? A) Fats provide the body with the chemicals necessary for controlling the pH of the blood. B) Fats act as a catalyst, reacting with the sugars in fruits and vegetables. C) Fats provide the body and its organs with insulation and protection. D) None of above. Show Answer Correct Answer: C) Fats provide the body and its organs with insulation and protection. 7. Which of these nitrogenous bases is NOT in DNA? A) Cytosine. B) Uracil. C) Guanine. D) Thymine. Show Answer Correct Answer: B) Uracil. 8. Carbon is the basis of biological polymers becauseI It can form chains by bonding to other carbon atomsII It is found in carbohydratesIII It can form four covalent bonds A) I only. B) I and II only. C) I and III only. D) I, II and III. Show Answer Correct Answer: C) I and III only. 9. If a piece of double stranded DNA has 30% G's, what percentage of the DNA is T's? A) 20%. B) 40%. C) 10%. D) 30%. Show Answer Correct Answer: A) 20%. 10. What is the name of the binding site of RNA polymerase in eukaryotes? A) Inducer. B) Promoter. C) Operon. D) Operator. Show Answer Correct Answer: B) Promoter. 11. What mutation is a deletion or insertion of one or more nucleotides that changes the reading frame of the base sequence? A) Splicing. B) Elongation. C) Frameshift. D) Mutagen. Show Answer Correct Answer: C) Frameshift. 12. The process of creating a protein from RNA is called A) Reverse transcription. B) Replication. C) Translation. D) Transcription. Show Answer Correct Answer: C) Translation. 13. Which of the following features is/are present in mitochondria but not in chloroplasts?I. DNA and ribosomesII. Outer and inner membranesIII. Cristae A) I only. B) II only. C) III only. D) I and III only. Show Answer Correct Answer: C) III only. 14. What enzyme keeps DNA from overwinding ahead of replication forks? A) Primase. B) Topoisomerase. C) Single-Stand Binding Protein. D) Helicase. Show Answer Correct Answer: B) Topoisomerase. 15. Fish, nuts, oils and avocado are health sources of..... A) Fat. B) Protein. C) Minerals. D) Fiber. Show Answer Correct Answer: A) Fat. 16. Which best describes the process of photosynthesis? A) Carbon dioxide and oxygen are converted into glucose and water. B) Carbon dioxide and water are converted into glucose and oxygen. C) Oxygen and glucose are converted into carbon dioxide and water. D) Oxygen and water are converted into carbon dioxide and glucose. Show Answer Correct Answer: B) Carbon dioxide and water are converted into glucose and oxygen. 17. Which type of diet best contributes to a healthy lifestyle? A) A diet high in fat and protein. B) A diet high in fruits, vegetables and fat. C) A diet high in carbohydrates and vegetables. D) A diet high in fruits, vegetables and lean protein. Show Answer Correct Answer: D) A diet high in fruits, vegetables and lean protein. 18. How do the leading, and the lagging strands differ? A) The leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction. B) The leading strand is synthesized at twice the rate of the lagging strand. C) The leading strand is synthesized in short fragments that are ultimately stitched together, whereas the lagging strand is synthesized continuously. D) The leading strand is synthesized by adding nucleotides to the 3' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 5? end. Show Answer Correct Answer: A) The leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction. 19. In an analysis of the nucleotide composition of DNA, which of the following will be found? A) A = C. B) A = G and C = T. C) A + C = G + T. D) G + C = T + A. Show Answer Correct Answer: C) A + C = G + T. 20. Which scientists built a 3-D model of the DNA double helix? A) Hershey and Chase. B) Watson and Crick. C) Chargaff and Franklin. D) Griffith and Avery. Show Answer Correct Answer: B) Watson and Crick. 21. Repetitive sequences of DNA on the ends of chromosomes (TTAGGG) that get smaller with each replication A) Telomerase. B) Telomeres. C) Primer. D) Okazaki fragments. Show Answer Correct Answer: B) Telomeres. 22. Which molecule created by plants is broken down by the human body to provide energy for its life processes? A) Glucose. B) Water. C) Carbon dioxide. D) Oxygen. Show Answer Correct Answer: A) Glucose. 23. The genetic code is essentially the same for all organisms. From this, one can logically assume which of the following? A) The same codons in different organisms translate into the different amino acids. B) A gene from an organism can theoretically be expressed by any other organism. C) All organisms have experienced convergent evolution. D) DNA was the first genetic material. Show Answer Correct Answer: B) A gene from an organism can theoretically be expressed by any other organism. 24. The shape of a DNA molecule is a: A) Single strand. B) Twisted cone. C) Double helix. D) Linear helix. Show Answer Correct Answer: C) Double helix. 25. Acridine orange is a ..... A) DNA Intercalating agent. B) Ligation agents. C) DNA polymerase. D) None of the above. Show Answer Correct Answer: A) DNA Intercalating agent. 26. If below is the wild-type DNA sequence, which one shows a point mutation?5'-ATTCGC-3' A) 5' - ATTCGC - 3'. B) 5' - AATTCGC - 3'. C) 5'- ATCCGC - 3'. D) 5' - ATCGC - 3'. Show Answer Correct Answer: C) 5'- ATCCGC - 3'. 27. Hydrochloric acid is secreted in the ..... . A) Oesophagus. B) Stomach. C) Large intestine. D) Small intestine. Show Answer Correct Answer: B) Stomach. 28. ..... are produced when DNA from another species is inserted into the genome of an organism, which then begins to produce the protein encoded on the recombinant DNA. A) Vectors. B) Gene guns. C) Plasmids. D) Transgenic organisms. Show Answer Correct Answer: D) Transgenic organisms. 29. Translation is the process where A) Is where lipids are synthesised. B) MRNA is created in the Nucleus. C) MRNA is decoded to form a protein. D) Glucose molecules are made. Show Answer Correct Answer: C) MRNA is decoded to form a protein. 30. Anticodons on tRNA pair with A) Amino acids. B) MRNA codons. C) TRNA condons. D) DNA codons. Show Answer Correct Answer: B) MRNA codons. ← 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