This quiz works best with JavaScript enabled. Home > Biology > Molecular Biology – Quiz 49 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 49 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A permanent change to the shape of a protein caused by the breaking of stabilizing bonds (h bonds) and interactions between R groups of their amino acids. A) Denaturation. B) Dipeptide. C) Condensation. D) Collagen. Show Answer Correct Answer: A) Denaturation. 2. Which part of a plant captures the light energy used in photosynthesis? A) Guard cells. B) Chlorophyll. C) Roots. D) None of above. Show Answer Correct Answer: B) Chlorophyll. 3. ..... directs construction of proteins. A) Hormones. B) RNA. C) Vitamins. D) DNA. Show Answer Correct Answer: D) DNA. 4. Catabolic reaction A) The breakdown of bigger molecules to smaller ones and uses energy. B) The build up of simpler molecules into more complex molecules and uses energy. C) The breakdown of complex molecules into more simpler molecules and doesn't require energy. D) The build up of small molecules into bigger ones and doesn't require energy. Show Answer Correct Answer: C) The breakdown of complex molecules into more simpler molecules and doesn't require energy. 5. What is the role of DNA ligase in the elongation of the lagging strand during DNA replication? A) It catalyzes the lengthening of telomeres. B) It synthesizes RNA nucleotides to make a primer. C) It unwinds the parental double helix. D) It joins Okazaki fragments together. Show Answer Correct Answer: D) It joins Okazaki fragments together. 6. Which element is most common in proteins? A) Nitrogen. B) Gercium. C) Iron. D) Phosphorus. Show Answer Correct Answer: A) Nitrogen. 7. What type of mutation has occurred here? T-G-A-C-C-A T-G-A-G-C-A A) Substitution. B) Deletion. C) Insertion. D) Frameshift. Show Answer Correct Answer: A) Substitution. 8. The end product of translation is what? A) Amino acid. B) Polypeptide. C) Sugar. D) Protein. Show Answer Correct Answer: B) Polypeptide. 9. How does RNA differ from DNA? A) RNA contains the sugar deoxyribose instead of ribose. B) RNA contains the nitrogen base thymine instead of uracil. C) RNA consists of one nucleotide chain instead of two. D) None of above. Show Answer Correct Answer: C) RNA consists of one nucleotide chain instead of two. 10. The anticodon of a particular tRNA molecule is A) Complementary to the corresponding mRNA codon. B) Complementary to the corresponding triplet in rRNA. C) The part of tRNA that bonds with a specific amino acid. D) Catalytic, making the tRNA a ribozyme. Show Answer Correct Answer: A) Complementary to the corresponding mRNA codon. 11. A healthy lifestyle can be described as A) Exercise to the point of exhaustion. B) Eating anything you like and exercising 3 times a week. C) Eating a balanced diet and exercise regularly. D) None of above. Show Answer Correct Answer: C) Eating a balanced diet and exercise regularly. 12. One of the following nucleic acids has a left handed helix A) M-RNA. B) T-RNA. C) A-DNA. D) Z-DNA. Show Answer Correct Answer: D) Z-DNA. 13. Do all point mutations make a change in the amino acid sequence of a protein? A) Yes, there will always be one amino acid changed by the mutation. B) No, some mutations may change a codon, but the protein will not change. This is because there is more than one codon for all amino acids except methionine and tryptophan. C) Yes, a point mutation changes the whole protein. D) No, point mutations are too small to change a protein. Show Answer Correct Answer: B) No, some mutations may change a codon, but the protein will not change. This is because there is more than one codon for all amino acids except methionine and tryptophan. 14. An unmutated segment of DNA containing 40 molecules of adenine will contain an equal number of what? A) Uracil. B) Cytosine. C) Guanine. D) Thymine. Show Answer Correct Answer: D) Thymine. 15. ..... in the pancreatic and intestinal juice completes the digestion of lipids. A) Amylase. B) Renin. C) Pepsin. D) Lipase. Show Answer Correct Answer: D) Lipase. 16. Different amino acids have different ..... groups. A) Amine. B) Carboxyl. C) Hydroxide. D) R. Show Answer Correct Answer: D) R. 17. What enzyme is responsible for transcription? A) DNA polymerase. B) RNA polymerase. C) Ribosomes. D) Nucleolus in the nucleus. Show Answer Correct Answer: B) RNA polymerase. 18. The majority of oxygen in the blood is carried by ..... in red blood cells. A) Hemoglobin. B) Fats. C) Glucose. D) Sodium chloride. Show Answer Correct Answer: A) Hemoglobin. 19. A metabolic pathway consists of ..... A) A series of reactions. B) A series of enzymes. C) A series of chemical reactions. D) A series of biological reactions. Show Answer Correct Answer: C) A series of chemical reactions. 20. Half of your grains should be A) White bread. B) Whole grains. C) Donuts. D) Bagels. Show Answer Correct Answer: B) Whole grains. ← 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