This quiz works best with JavaScript enabled. Home > Biology > Molecular Biology – Quiz 47 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 47 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Why might a mutation in DNA prevent a protein from functioning? A) The protein can't fold up properly. B) The protein can't bind to other molecules anymore. C) Functional parts of the protein are missing. D) All of the above. Show Answer Correct Answer: D) All of the above. 2. Which best describes how a new phenotypic characteristic may result from a change in the DNA sequence of a gene. A) The DNA sequence codes for the order of the amino acids found in a protein. Each of the 20 amino acids have different chemical properties and polarities. If the DNA sequence is changed due to a mutation, this causes the order of the amino acids in the protein to change. This causes the overall shape and therefore function of the protein to change. This change in protein structure can cause phenotypic changes. B) The phenotype is controlled by random chance. So it can randomly be changed at any time. C) The photosynthesis of plants, change how our genes line up when we eat them., This change causes a vast array of phyotypical combinations. This shows that we could have many different and new genes expressed every day. D) It is due to the processes of transcription and transduction. Show Answer Correct Answer: A) The DNA sequence codes for the order of the amino acids found in a protein. Each of the 20 amino acids have different chemical properties and polarities. If the DNA sequence is changed due to a mutation, this causes the order of the amino acids in the protein to change. This causes the overall shape and therefore function of the protein to change. This change in protein structure can cause phenotypic changes. 3. Which process adds a Guanine to the 5' end? A) Polyadenylation. B) Splicing. C) Capping. D) Post transcriptional processing. Show Answer Correct Answer: C) Capping. 4. What is the name of the genetic material that is inside the nucleus? A) ER. B) ATP. C) YOLO. D) DNA. Show Answer Correct Answer: D) DNA. 5. RNA is essential for the building of proteins. Which of these is NOT a type of RNA? A) Messenger RNA. B) Mitochondrial RNA. C) Transfer RNA. D) Ribosomal RNA. Show Answer Correct Answer: B) Mitochondrial RNA. 6. Which molecule provided by plants accounts for the energy in a herbivore's diet? A) Glucose. B) Protein. C) Salt. D) None of above. Show Answer Correct Answer: A) Glucose. 7. Sickle Cell AnemiaSequence for Normal HemoglobinDNA Sequence ATGGTG CAC CTG ACT CCT GAG GAG AAG TCT GCC GTT ACTAmino Acid Seq.STARTValHisLeuThrProGluGluLysSerAlaValThe Sequence for Sickle Cell HemoglobinDNA SequenceATGGTG CAC CTG ACT CCT GTG GAG AAG TCT GCC GTT ACTAmino Acid Seq.STARTValHisLeuThrProValGluLysSerAlaValSickle Cell Anemia is a blood disorder caused by an error in the amino acid sequence of the protein hemoglobin. Figure 2 depicts the normal hemoglobin DNA sequence and amino acid sequence and the sequences found in patients affected by sickle cell anemia. Why would the highlighted changes likely cause problems for affected individuals? A) Different amino acids have different polarities. The change in the amino acid sequence thus causes a change in the overall shape of the protein. Since structure largely determines function, the changed protein doesn't function correctly. B) The indicated changes should have little effect on the overall protein structure/function. The problem must have something to do with the mRNA instead of the DNA. C) Since "Val" and "Glu" are very similar amino acids, the amino acid substitution is not the cause of the symptoms associated with sickle cell. The problem must be related to the environment. D) None of the above. Show Answer Correct Answer: A) Different amino acids have different polarities. The change in the amino acid sequence thus causes a change in the overall shape of the protein. Since structure largely determines function, the changed protein doesn't function correctly. 8. The circular DNA found in bacteria A) Plaster. B) Plasmids. C) Chromatin. D) Chromatids. Show Answer Correct Answer: B) Plasmids. 9. Which mutation is most likely to change a protein? A) Changing one base to another. B) Changing one codon to another. C) Adding one nucleotide to a gene. D) Adding 3 nucleotides to a gene. Show Answer Correct Answer: C) Adding one nucleotide to a gene. 10. Why is respiration important for digestion? A) Respiration provides carbon dioxide for the digestion of food. B) Respiration provides hydrogen for the digestion of food. C) Respiration provides oxygen for food the combustion of food molecules to produce ATP. D) None of above. Show Answer Correct Answer: C) Respiration provides oxygen for food the combustion of food molecules to produce ATP. 11. What does DNA stand for? A) Deoxyribonucleic acid. B) Denitrogenous acid. C) Deribonucleic acid. D) Diribonucleic acid. Show Answer Correct Answer: A) Deoxyribonucleic acid. 12. A portion of mRNA is coded CUG. The corresponding DNA is coded A) GAC. B) GTC. C) CTG. D) CAG. Show Answer Correct Answer: A) GAC. 13. Why might a point mutation in DNA make a difference in the level of a protein's activity? A) It might substitute a different amino acid in the active site. B) It might exchange one serine codon for a different serine codon. C) It might result in a chromosomal translocation. D) None of above. Show Answer Correct Answer: A) It might substitute a different amino acid in the active site. 14. Which bacterium is used in the production of insulin by genetic engineering? A) Saccharomyces. B) Rhizobium. C) Mycobacterium. D) Escherichia. Show Answer Correct Answer: D) Escherichia. 15. What is the effect of a nucleotide-pair substitution that results in a nonsense mutation in a gene? A) It changes an amino acid in the encoded protein. B) It has no effect on the amino acid sequence of the encoded protein. C) It introduces premature stop codon into the mRNA. D) It alters the reading frame of the mRNA. Show Answer Correct Answer: C) It introduces premature stop codon into the mRNA. 16. The function of the operator is to A) Regulate access of RNA polymerase to specific genes. B) Turn on and off the molecules of tRNA. C) Control the process of transcription within the nucleus. D) Generate amino acids for protein synthesis. Show Answer Correct Answer: A) Regulate access of RNA polymerase to specific genes. 17. Which of the following features are correct for hydrogen bonding?I. It is involved in the cohesion of water.II. It results in the thermal properties of water.III. It is a bond within the water molecule. A) I and II only. B) II and III only. C) I and III only. D) I, II and III. Show Answer Correct Answer: A) I and II only. 18. Which of the following is NOT true of a codon? A) It may code for the same amino acid as another codon. B) It never codes for more than one amino acid. C) It extends from one end of a tRNA molecule. D) It is the basic unit of the genetic code. Show Answer Correct Answer: C) It extends from one end of a tRNA molecule. 19. The function of insulin is A) Catalysis. B) Packing of DNA. C) A hormone. D) Blood clotting. Show Answer Correct Answer: C) A hormone. 20. ..... bring amino acids to the ribosomes. A) TRNA. B) RRNA. C) MRNA. D) DNA. Show Answer Correct Answer: A) TRNA. ← PreviousNext →Related QuizzesMolecular Biology Quiz 1Molecular 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 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books