Which of the following is True?
- a. Enzymes increase activation energy requirements.
- b. Activation energy is required to initiate exergonic reactions.
- c. Heat cannot supply activation energy.
- d. Stomach acid inactivates pepsin.
Introduction:
Activation energy is the energy required to metabolize the chemical reactions inside the cell leading to the formation of products from the reactants. This energy barrier is decreased by the help of enzyme involved in the metabolic process.
Answer to Problem 1MC
Correct answer:
Activation energy is required for the initiation of the exergonic reactions after the thermodynamic barrier is overcome by the enzyme catalyzing the metabolic thermodynamic reaction. Therefore, option (b) is correct.
Option (b) is given as “Activation energy is required to initiate exergonic reactions”.
Explanation of Solution
Justify reasons for the correct statement:
The catalysis of the metabolic reactions leading to the formation of products from reactants is overcome after crossing the energy barrier. The energy provided for overcoming this is provided by the activation energy required to initiate the process of exergonic reactions.
Hence, option (b) is correct.
Justify reasons for the incorrect statements:
Option (a) is given as “Enzymes increase activation energy requirements”. Enzymes decrease the activation energy of the metabolic reactions. Hence, it is a wrong answer.
Option (c) is given as “Heat cannot supply activation energy”. Activation energy is required to overcome the energy barrier of the metabolic reaction. Heat provides energy for the reaction to occur spontaneously. Hence, it is a wrong answer.
Option (d) is given as “Stomach acid inactivates pepsin”. Stomach acid initiates the formation of pepsin from pepsinogen. Hence, it is a wrong answer.
Hence, options (a), (c), and (d) are incorrect.
Activation energy is required for overcoming the energy barrier required for driving the exergonic process inside the cell.
Want to see more full solutions like this?
Chapter 6 Solutions
Biology
- Which of the following statements concerning the location of the metabolic pathways is correct? a. All reactions of the glycolysis take place in the mitochondria. b. All reactions of the TCA cycle take place in the mitochondria. c. Some reactions of the TCA cycle take place in the cytosol, and some in mitochondria. d. Some reactions of the glycolysis take place in the cytosol, and some in mitochondria.arrow_forwardWhich of the following statements is (are) accurate about aerobic and anaerobic respiration?a. Aerobic respiration is best for sprints.b. Anaerobic respiration is best for long distances because it does not need large amounts of oxygen.c. Aerobic respiration is faster.d. Aerobic respiration produces more energy per glucose molecule.e. Both aerobic respiration and anaerobic respiration start with glycolysis.arrow_forwardPenicillin functions by inhibiting an enzyme, transpeptidase, that catalyzes the last step in the bacteria's metabolism which synthesises bacterial the cell-wall. Why does inhibition of this enzyme make Penicilin such an effective medicine in humans, with so few side effects? A. Inhibiting enzymes like this always slows the metabolism of an organism. B. The enzyme is not inhibited in humans because we have resistance to the penicillin. C. The enzyme is part of an essential pathway in the bacteria, which does not exist in humans. D. Inhibiting the enzymes stops respiration in the bacteria, killing quickly.arrow_forward
- Which of the following statements is/are FALSE about glycolysis? A. It is an anaerobic process. B. Some steps occur in cytosol, others in mitochondria. C. It is the conversion of glucose to lactate or ethanol. D. It is the 1st stage of glucose metabolism.arrow_forwardWhich of the following statements about folic acid is not true? a. Folic acid is activated by folate synthase. b. Folic acid structure contains a pteridine ring and para-amino benzoic acid. c. NADPH is required in the reactions activating folic acid. d. Tetrahydrofolate is the biologically active derivative of folic acid.arrow_forwardWhich ONE of the following would be most effective as a feedback mechanism for anenzymatic reaction? A. Reduced concentration of the product B. A change in pH C. Increased concentration of substrate D. Temporary binding of a non-substrate molecule in the active binding sitearrow_forward
- Which of the following is a primary function of the active site of an enzyme? a. It binds allosteric regulators of the enzyme. b. It binds noncompetitive inhibitors of the enzyme. c. It catalyzes the reaction associated with the enzyme. d. It is activated by the presence of the end product of the metabolic pathway in which the enzyme is involved. Clear my choice Question 2 Not yet answered Points out of 2.00 Flag question Question text Which of the following statement about the mass spectrometry is true? a. Large amount of protein sample is needed for mass spectrum, and thus it is very expensive. b. It is a powerful method to determine the 3-dimensional structure of proteins. c. It can be sued for protein location in a living cell. d. It can be used to measure the molecular weight of proteins. e. It can be used to determine the stability of a protein structure in solution. Clear my choice…arrow_forwardIn an inborn error of metabolism, a. a genetic change results in the production of a defective enzyme. b. intermediates produced prior to the defective step accumulate. c. alternate pathways are taken by intermediates at branch points that precede the defective step. d. All of these are true.arrow_forwardWhich of the following statements concerning glycogen in different tissues is TRUE? a. Liver glycogen serves as a fuel reserve for ATP synthesis during muscle contraction. b. Brain glycogen serves as a source of blood glucose. c. Red blood cells use glycogen as a source of blood glucose. d. Muscle glycogen serves as a fuel reserve for ATP synthesis during muscle contraction. e. Muscle glycogen serves as a source of blood glucose.arrow_forward
- Which of the following statements concerning gluconeogenesis is NOT true? a. Gluconeogenesis is to make glucose from glycogen. b. Many of the reactions of gluconeogenesis are glycolytic reactions going in reverse. c. The process of gluconeogenesis consumes ATP. d. The process of gluconeogenesis is regulated by ATP. e. Gluconeogenesis maintains the blood glucose level long after all dietary glucose has been absorbed and oxidized.arrow_forwardWhich of the following is true?a. Triglycerides have the least energy content per gram of the three majorenergy sources in the body.b. Fat catabolism generates new triglycerides for storage in adipose tissue.c. By mass, the total-body content of carbohydrates exceeds that of total triglycerides.d. Catabolism of fatty acids occurs in two-carbon steps.e. Triglycerides are the major lipids found in plasma membranesarrow_forwardWhich of the following is FALSE about glycolysis? a. The pathway axidizes two moles of NADH to NAD* for each mole of glucose. b. The pathway requires two moles of ATP to get started catabolizing each mole of glucose. c. ADP is phosphorylated to ATP via substrate -level phosphorylation. d. The pattivay produces pyruvate as one of its products.arrow_forward
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education