Concept explainers
Which of the following statements is false?
a.
b. Anabolic pathways are exergonic and release energy.
c. Catabolic pathways break larger substances into smaller substances.
d. The body “pays for” anabolic reactions with the energy from catabolic reactions.
Introduction:
All the living organisms require energy to carry out normal functions of the body. The energy obtained from different food sources are used by the body to create useful or essential products which help in growth and reproduction. Metabolism is the sum total of all reactions which takes place in the body and it includes both anabolism and catabolism.
Answer to Problem 1CYR
Correct answer:
Anabolic pathways are exergonic and release energy
Explanation of Solution
Justification/ Explanation for the correct answer:
Option ( b ) states that anabolic pathways release energy as they are exergonic. The statement is false because anabolism is building up a process where small molecules are combined to form a large or complex molecule. Anabolic pathways are endergonic as this reaction needs the energy to create bonds between small molecules. So, option ( b ) is correct.
Explanation for the incorrect answers:
Option (a) states that metabolism includes or refers to all the reactions which take place in the body. The statement is true as metabolism includes both anabolism, or building up process and catabolism, or breaking down process. So, it is an incorrect option.
Option (c) states that catabolic pathways include reactions which break down large complex substances into simpler ones. The statement is true because catabolism is a breaking down process which releases energy. So, it is an incorrect option.
Option (d) states that anabolic reactions get energy from catabolic reactions. The statement is true as the anabolic reactions require energy to create bonds and it is obtained from catabolic reactions which release energy by breaking chemical bonds. So, it is an incorrect option.
Hence, options (a), (c), and (d) are incorrect.
Thus, anabolic pathways are endergonic as it requires energy whereas catabolic pathways are exergonic as it releases energy.
Want to see more full solutions like this?
Chapter 23 Solutions
EP HUMAN ANATOMY+PHYSIOLOGY-MOD.MASTER.
- Well over half of the human body’s energy is devoted to which of the following? A. Basal metabolism B. Muscle contractions C. Brain activity D. Keeping the heart goingarrow_forwardHomeostatic systems maintain a steady-state set point over time using negative feedback. Which one of the following statement is NOT TRUE for stability of metabolic system: Select one: a. Step changes in a controlled variable will return the system to its original state using negative feedback b. Metabolic systems that oscillate must have multiple control variables c.A positive feedback system is stable over time, maintaining a steady state d. Perturbations from steady state, either positive or negative, result in recovery reactions that returm the system to is original state.arrow_forwardWhich of the following statements is TRUE? Select one: A. Lactic acid is a product of aerobic respiration; ethyl alcohol is a product of fermentation. B. Oxidation is the loss of electrons; reduction is the gain of electrons. C. Oxygen is a product of cellular respiration; carbon dioxide is a product of photosynthesis. D. Glucose is a product of aerobic respiration; lactic acid is a product of anaerobic respiration.arrow_forward
- Chemotrophic energy metabolism is a catabolic and exergonic process that produces ATP from oxidizing molecules. Which among the following is not an energy source of chemotrophic energy metabolism? A. Iron B. Photons C. Carbohydrates D. Proteinsarrow_forwardSome exergonic chemical reactions that proceed slowly in the outside world proceed quickly in the human body. This is primarily because Select one: a. Body temperature is higher than outside temperature. b. Humans have enzymes that lower the activation energy of a chemical reaction. c. Humans have enzymes that increase the amount of energy released by a chemical reaction. d. All of the abovearrow_forwardWhich 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.arrow_forward
- Which of the following statements about glucose metabolism is correct? A. Glucagon increases the rate of glycolysis B. Glycolysis requires NADP+ C. In glycolysis, glucose is cleaved into two three-carbon product D. The end-product of glycolysis in red blood cells is pyruvate E. Glycogen is synthesized in the liver in response to insulin and exported to other tissues for use as a metabolic fuelarrow_forwardWhich 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 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_forward
- Which of the following choices BEST describes metabolism? a. breakdown of biomolecules b. controlled by enzymes and involved ATP c. all of the choices are correct d. synthesis of biomoleculesarrow_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 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_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College