This quiz works best with JavaScript enabled. Home > Biology > Molecular > Molecular Biology – Quiz 32 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 32 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is false about purine and pyrimidine bases? A) They are hydrophobic and relatively insoluble in water at the near-neutral pH of the cell. B) At acidic or alkaline pH the bases become charged and their solubility in water increases. C) Purines have two rings in their structure, but pyrimidine bases have only one ring. D) At acidic or alkaline pH the bases become charged and their solubility in water decreases. Show Answer Correct Answer: D) At acidic or alkaline pH the bases become charged and their solubility in water decreases. 2. The RNAs required in the cytoplasm for protein synthesis A) RRNA and tRNA. B) RRNA and mRNA. C) MRNA and tRNA. D) RRNA, mRNA and tRNA. Show Answer Correct Answer: D) RRNA, mRNA and tRNA. 3. Which of the following foods is not a grain source? A) Brown Rice. B) Nuts. C) Wheat Bread. D) Spaghetti. Show Answer Correct Answer: B) Nuts. 4. Which statement about water is correct? A) The atoms within a molecule of water are held together by hydrogen bonds. B) Water has a low heat capacity allowing enzymatic reactions to happen at a wide range of temperatures. C) Water molecules are polar, therefore fatty acids do not dissolve. D) Ice has a higher density than liquid water, therefore some organisms can live under the ice. Show Answer Correct Answer: C) Water molecules are polar, therefore fatty acids do not dissolve. 5. Which part of a gene has the code for an amino acid? A) Exons. B) Introns. C) Upons. D) Downons. Show Answer Correct Answer: A) Exons. 6. What does a flagellum do? A) It helps the cell move. B) It helps the cell make protein. C) It stores water and energy for the cell to use later. D) I don't know, but it looks cool. Show Answer Correct Answer: A) It helps the cell move. 7. According to Chargaff's rule, in a DNA molecule A) The amount of adenine and thymine is equal to the amount of guanine and cytosine. B) The amount of adenine and guanine is equal to the amount of thymine and cytosine. C) The amount of adenine and uracil is equal to the amount of guanine and cytosine. D) The amount of adenine and guanine is equal to the amount of uracil and cytosine. Show Answer Correct Answer: A) The amount of adenine and thymine is equal to the amount of guanine and cytosine. 8. Introns are removed from mRNA by the process of A) Splicing. B) Frameshift. C) Elongation. D) Mutagen. Show Answer Correct Answer: A) Splicing. 9. Before DNA could definitively be shown to be the genetic material in cells, scientists had to show that is could A) Tolerate high temperatures. B) Carry and make copies of information. C) Be modified in response to environmental conditions. D) Be broken down into small subunits. Show Answer Correct Answer: B) Carry and make copies of information. 10. PROCESSES: DNA making RNA is called: A) Translation. B) Transcription. C) Transference. D) Translocation. Show Answer Correct Answer: B) Transcription. 11. The process of consumption of liquid food is A) Phagocytosis. B) Exocytosis. C) Pinocytosis. D) None of above. Show Answer Correct Answer: C) Pinocytosis. 12. Which would be the benefit of a transgenic crop? A) Decreased drought tolerance. B) Decreased disease resistance. C) Increased resistance to pests. D) Increased demands for nutrients. Show Answer Correct Answer: C) Increased resistance to pests. 13. Which part is LEAST associated with protein synthesis? A) Polymerase. B) Ribosomes. C) MRNA. D) Anticodons. Show Answer Correct Answer: A) Polymerase. 14. Which is a genetically modified crop? A) Bt-cotton. B) Bt-brinjal. C) Golden rice. D) All. Show Answer Correct Answer: D) All. 15. How do scientists cut DNA into smaller strands? A) Restriction enzymes. B) Scissors. C) Ligase. D) Agarose. Show Answer Correct Answer: A) Restriction enzymes. 16. In addition to mRNA and a ribosome, what other macromolecule is needed in the second step of protein synthesis? A) Lipids. B) TRNA. C) DNA. D) Carbon dioxide. Show Answer Correct Answer: C) DNA. 17. If DNA has a strand with a sequence of TAC - GTG - CGA - ATT, the transcribed mRNA strand would be: A) AUG - CAC - GCU - TTT. B) ATG - CAC - GGG - TAA. C) AUG - CAC - GCU - UAA. D) UAC - GGG - CCC - UAA. Show Answer Correct Answer: C) AUG - CAC - GCU - UAA. 18. A segment of DNA is called a A) Chromosome. B) Gene. C) Phenotype. D) Genotype. Show Answer Correct Answer: B) Gene. 19. Beans, poultry and fish are good sources of ..... A) Lipids. B) Protien. C) Carbohydrate. D) Nucleic acid. Show Answer Correct Answer: B) Protien. 20. Why is protein an important part of a healthy diet? A) It is needed to change glucose to energy. B) It is needed to store nutrients. C) It is needed to repair tissue. D) It is needed to produce water. Show Answer Correct Answer: C) It is needed to repair tissue. ← PreviousNext →Related QuizzesBiology 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books