This quiz works best with JavaScript enabled. Home > Biochemistry > Biochemistry – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Biochemistry Quiz 12 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Structure of Water A) Two oxygen atom and one hydrogen atom. B) One oxygen atom and one hydrogen atom. C) Two oxygen atom and two hydrogen atom. D) Two hydrogen atom and one oxygen atom. Show Answer Correct Answer: D) Two hydrogen atom and one oxygen atom. 2. How many electrons does a carbon have? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: D) 4. 3. How many different amino acids are there? A) 4. B) 20. C) 6. D) 46. Show Answer Correct Answer: B) 20. 4. Which is not a chemical element needed to build sugars? A) Carbon. B) Oxygen. C) Nitrogen. D) Hydrogen. Show Answer Correct Answer: C) Nitrogen. 5. Amino acids are the subunits of ..... A) Proteins. B) Carbohydrates. C) Nucleic acids. D) Lipids. Show Answer Correct Answer: A) Proteins. 6. What colour forms the raction of tryptophan indole ring with glyoxylic acid in the presence of sulphuric acid (VI)? A) Red-violet. B) Red-blue. C) Blue-yellow. D) Blue-brown. Show Answer Correct Answer: A) Red-violet. 7. Which of the following decreases the activation energy necessary to initiate the chemical change within the body? A) Nucleotides. B) Enzymes. C) Amino acids. D) Fatty acids. Show Answer Correct Answer: B) Enzymes. 8. What are called the fragments of molecules of amino acids that are fixed with the alfa-carbon? A) Radical. B) Side chains/side substituents. C) Substituents. D) Peptides. Show Answer Correct Answer: B) Side chains/side substituents. 9. The following characteristics are true of which macromolecule? compose cell membranes contain many high-energy bonds include waxes and steroids contain more energy per gram than others A) Monosaccharide. B) Protein. C) Lipid. D) Nucleic acid. Show Answer Correct Answer: C) Lipid. 10. The energy actually available to do work is known as .....? A) Free energy. B) Entropy. C) Law conservation of energy. D) Dynamic potential. Show Answer Correct Answer: A) Free energy. 11. What is the main similarity between these two polymers:Proteins vs Carbohydrates A) Both polymer provide energy. B) Both polymers are needed for insulation. C) Both polymers provide genetic information. D) Both polymers make up enzymes. Show Answer Correct Answer: A) Both polymer provide energy. 12. Enzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means? A) Reducing the number of products. B) Reducing the activation energy. C) Increasing the temperature of the cell. D) Increasing the concentration of reactants. Show Answer Correct Answer: B) Reducing the activation energy. 13. Made of amino acids A) Carbohydrates. B) Lipids. C) Proteins. D) Nucleic Acids. Show Answer Correct Answer: C) Proteins. 14. Four most common elements that make up all living things are carbon, hydrogen, A) Nitrogen, and iron. B) Calcium, and phosphorus. C) Oxygen, and nitrogen. D) Oxygen, and iron. Show Answer Correct Answer: C) Oxygen, and nitrogen. 15. What is syneresis? A) When carbohydrates are heated. B) When a sauce becomes thick. C) Overcooking a protein which causes it to become rubbery as the water is squeezed out. D) Whisking to make a foam. Show Answer Correct Answer: C) Overcooking a protein which causes it to become rubbery as the water is squeezed out. 16. Which nif gene is responsible for "positive regulation" A) Nif B. B) Nif D. C) Nif A. D) Nif L. Show Answer Correct Answer: C) Nif A. 17. Gluconeogenesis is a ..... process. A) Anabolic. B) Catabolic. C) Hyperbolic. D) Androbolic. Show Answer Correct Answer: A) Anabolic. 18. What measures energy in food? A) Calories. B) Ruler. C) Thermometer. D) Food label. Show Answer Correct Answer: A) Calories. 19. Examples of amino acids with polar chains without charge. A) Cysteine. B) Serine. C) Tyrosine. D) All the anteriors. Show Answer Correct Answer: D) All the anteriors. 20. Which chemical elements make up the majority of living biological matter? A) Carbon. B) MASS. C) V. D) The chemical elements that make up the majority of the molecules of living organisms are oxygen (O), carbon (C), hydrogen (H) and nitrogen (N). Show Answer Correct Answer: D) The chemical elements that make up the majority of the molecules of living organisms are oxygen (O), carbon (C), hydrogen (H) and nitrogen (N). ← 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