This quiz works best with JavaScript enabled. Home > Biochemistry > Biochemistry – Quiz 50 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Biochemistry Quiz 50 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What can reduce or destroy enzyme activity? A) Excessive heat. B) Strong acid. C) Strong base. D) All of the above. Show Answer Correct Answer: D) All of the above. 2. Cellulose, glycogen, starch, or chitin A) Carbohydrates. B) Lipids. C) Proteins. D) Nucleic acid. Show Answer Correct Answer: A) Carbohydrates. 3. Fats are specialized lipid molecules, and enzymes are specialized protein molecules. How dothe functions of fats and enzymes differ? A) Fats are structural building materials, while enzymes are transportation molecules. B) Fats provide support for cells, while enzymes lower the pH of gastric fluids. C) Fats regulate body functions, while enzymes denature invasive bacteria. D) Fats are storage molecules, while enzymes are catalytic molecules. Show Answer Correct Answer: D) Fats are storage molecules, while enzymes are catalytic molecules. 4. Can you identify this Vitamin? This vitamin maintains a lot of your body's tissues, like the ones in your eyes, skin and liver. It protects your lungs from becoming damaged by polluted air and is important for the formation of red blood cells. A) Vitamin K. B) Vitamin E. C) Vitamin C. D) Vitamin A. Show Answer Correct Answer: B) Vitamin E. 5. Which macromolecule is made of simple and complex sugars? A) Lipids. B) Proteins. C) Carbohydrates. D) Nucleic acids. Show Answer Correct Answer: C) Carbohydrates. 6. On an enzyme, the site that attaches to a substrate A) Polypeptide. B) Base. C) Substrate. D) Active site. Show Answer Correct Answer: D) Active site. 7. The central region of an atom where its neutrons and protons are is its ..... A) Nucleus. B) Electron cloud. C) Core. D) Proton. Show Answer Correct Answer: A) Nucleus. 8. A particle that moves around the nucleus is a(n) ..... A) Proton. B) Neutron. C) Electron. D) Quark. Show Answer Correct Answer: C) Electron. 9. Which is the monomer (building block) for nucleic acids? A) Amino acid. B) Fatty acid & glycerol. C) Nucleotide. D) Monosaccharide. Show Answer Correct Answer: C) Nucleotide. 10. What are the monomers of a polysaccharide? A) Glycerol. B) Amino acid. C) Fatty acid. D) Glucose. Show Answer Correct Answer: D) Glucose. 11. Made of monomers of nucleotides A) Carbohydrates. B) Lipids. C) Proteins. D) Nucleic Acids. Show Answer Correct Answer: D) Nucleic Acids. 12. Which of the following substances would have the greatest concentration of H+ ions? A) Ammonia with pH 13. B) Water with pH 7. C) Milk with pH 5. D) Lemon juice with pH 2. Show Answer Correct Answer: D) Lemon juice with pH 2. 13. Which of the following is not an RNA nitrogenous base? A) Adenine. B) Thymine. C) Guanine. D) Uracil. Show Answer Correct Answer: B) Thymine. 14. Cells aggregate to form tissues or organs and these are further organized to form whole organism. A) Prokaryotes. B) Eukaryotes. C) Fungi. D) Bacteria. Show Answer Correct Answer: B) Eukaryotes. 15. It is an enzyme that catalyzes the decomposition of carbonic acid into carbon dioxide and water A) Carbonic anhydrase. B) Enzymes. C) Catalysts. D) Anhydrase. Show Answer Correct Answer: A) Carbonic anhydrase. 16. Debye Interaction deals with .....? A) A permanent and induced dipole. B) Induced and induced dipole. C) Two permanent dipole. D) Instant dipole - induced dipole forces. Show Answer Correct Answer: A) A permanent and induced dipole. 17. What element do organic compounds contain? A) Hydrogen. B) Oxygen. C) Carbon. D) Sulfur. Show Answer Correct Answer: C) Carbon. 18. May be saturated or unsaturated A) Carbs. B) Lipids. C) Proteins. D) Nucleic acids. Show Answer Correct Answer: B) Lipids. 19. Which are the denaturising factors? A) Elevated temperature, organic solvents, acids, alkalis, heavy metal ions, concentrated solutions of urea or guanidine hydrochloride. B) Elevated temperature, acids, alkalis, heavy metal ions, concentrated solutions of urea or guanidine hydrochloride. C) Elevated temperature, organic solvents, alkalis, heavy metal ions, concentrated solutions of urea or guanidine hydrochloride. D) Elevated temperature, organic solvents, acids, heavy metal ions, concentrated solutions of urea or guanidine hydrochloride. Show Answer Correct Answer: A) Elevated temperature, organic solvents, acids, alkalis, heavy metal ions, concentrated solutions of urea or guanidine hydrochloride. 20. Why can water have no net charge but have slight charges in different parts of the molecule? A) The oxygen end is slightly negative and the hydrogen end is slightly positive. B) The hydrogen end is slightly negative and the oxygen end is slightly positive. C) The hydrogen and oxygen ends change in polarity. D) Because it is hydrophobic. Show Answer Correct Answer: A) The oxygen end is slightly negative and the hydrogen end is slightly positive. ← PreviousNext →Related QuizzesBiochemistry Quiz 1Biochemistry Quiz 2Biochemistry Quiz 3Biochemistry Quiz 4Biochemistry Quiz 5Biochemistry Quiz 6Biochemistry Quiz 7Biochemistry Quiz 8Biochemistry Quiz 9Biochemistry Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books