is the sum of all chemical reactions in the body. It allows the body to convert energy from oods into energy needed for physical activity. reactions involve the formation of new bonds, which requires energy. n both catabolic and anabolic reactions, some energy is released as
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- Which of the following statements is NOT true? None of the other four answers (all are true) The energy required to cause a chemical reaction to occur is called the activation energy Decomposition (degradation, catabolic) reactions are usually endergonic Chemical reactions in living cells are catalyzed by enzymes Enzymes increase the probability that a chemical reaction will take place by lowering the activation energyWhich of the following statements is NOT true? Enzymes increase the probability that a chemical reaction will take place by lowering the activation energy The energy required to cause a chemical reaction to occur is called the activation energy Chemical reactions in living cells are catalyzed by enzymes None of the other four answers (all are true) Decomposition (degradation, catabolic) reactions are usually endergonicEnzymes are key components in biological reactions. Which of the following statements about enzyme function in biological systems is FALSE? Enzymes are key components in biological reactions. Which of the following statements about enzyme function in biological systems is FALSE? Enzymes increase the rate of a reaction, but do not change the free energy of a reaction. Enzymes frequently work in metabolic pathways, such that the activity of one enzyme can affect the activity of a second enzyme in the pathway by altering the concentration of a substrate or product of the second enzyme. Enzymes will alter the equilibrium of a reaction such that the enzyme increases the exergonic reaction relative to the endergonic reaction. Even if the enzyme forms a bond with a substrate during a reaction, the enzyme returns to its original form at the end of the reaction.
- Which of the following organic compounds is the richest source of energy? (Only one choice is correct). Fat Carbohydrates ProteinsEnzymes are not used up in chemical reactions, so what exactly does an enzyme do? Refer to activation energy (transition state etc)Which of the following is the most comprehensive definition of metabolism in living organisms? Metabolism manages the increase in entropy in an organism Metabolism consists of all the energy transformation reactions in an organism Metabolism refers to the sum of all biochemical pathways involved in the synthesis of macromolecules Metabolism depends on a constant supply of energy from food
- Adenosine triphosphate (ATP) serves which key role in metabolism? Storage of energy in chemical bonds Building block for lipids Storage of energy as heat Building block for proteinsCoenzymes function to: change the shape of enzymes, allowing different additional substrates to bind. denature the enzyme, stopping the chemical reaction from occurring. interact directly with enzymes, either enabling the reaction to occur or making the substrate-enzyme interaction more efficient. dilate blood vessels, allowing more blood to flow, allowing more substrate to reach enzymes. absorb excess hydrogen and hydroxide ions, keeping the pH relatively stable, so that reactions can occur most efficiently.Which statement is true? A person obtains all of the body's coenzymes from their food.. Enzymes are specific in their catalytic function. Enzymes decrease the rate of a chemical reaction. All enzymes need to have chemical cofactors to function properly.
- The following speaks true of metabolism EXCEPT* Property consistent to all organisms ranging from prokaryotes to the human organism. Sum total reactions in the body Metabolic reactions contribute to homeostasis by harvesting chemical energy Metabolic reactions are entirely exergonic reactions Which of the following best characterizes ANABOLISM?* It is largely exergonic reaction because it releases energy in the form of heat It is involved in the building up process from polymers to monomers Reactions are usually oxidative and degradative Plays a crucial role in growth repair and maintenance of body structures The oxidation of glucose to produce ATP is also known as cellular respiration, and it involves four sets of reactions, which of the following is not part of the four sets of reactions?* Formation of pyruvic acid Glycolysis Formation of acetyl coenzyme A Citric Acid cycle Which of the following is an inaccurate statement?* fatty acids and glycerol are the building…Each ATP molecule contains about 1% of the amount of chemical energy available from the complete oxidation of a single glucose molecule. Cellular respiration produces about 38 ATP from one glucose molecule. What happens to the rest of the energy in glucose? It is stored as fat. It is converted to heat. It is used to make water from hydrogen ions and oxygen. It is released as carbon dioxide and water It is converted to starch.It is INCORRECT to affirm that: Chemical reactions called oxidation-reduction reactions are essential to life since they are the reactions that break down food molecules to produce energy. Oxidation refers to the loss of electrons; in this process the oxidized substance releases energy. Reduction refers to the gain of electrons; in this process, the reduced substance gains energy. Oxidation-reduction reactions do not always parallel; when one substance is oxidized, another also can be oxidized at the same time.