all of the following statements about enzymes are correct except

Chapter 15—Enzyme Regulation MULTIPLE CHOICE 1. b. Secretion of enzymes by acinar cells occurs in response to CCK. B. b. Enzymes can be inactivated by the addition of a functional group. All of the following are correct statements about pancreatic exocrine secretion EXCEPT. BPG shifts the oxygen saturation curve of Hb to the ____ because BPG binds to ____ making Hb an O2 delivery system eminently suited for ____. Enzymes allow molecules to react in metabolism by lowering activation energies. e. (C) Some enzymes contain an essential nonprotein component. 8. clothes washing detergent must be able to remove grease and oil stains from clothing while also dissolving and washing away in the rinse water. d. Secretin and CCK both act via formation of cyclic nucleotide 2nd messengers. … b. Enzymes can be inactivated by the addition of a functional group. A. While the inhibitor occupies the active site it prevents binding of the substrate to the enzyme. b) Glutamate. They enable reactions to occur at a relatively low temperature. The allosteric site on an enzyme can allow the product of a metabolic pathway to inhibit that enzyme and stop the pathway. The pancreas secretes a large amount of digestive enzymes after a meal. d) Serine. D) They contain more hydrogen than saturated fats having the same number of carbon atoms. The enzyme activity decreases with slight decrease or increase from the optimum temperature range. All enzymes are protiens, enzymes do not speed up the reaction, heat does, enzymes do not change the products but they can perform over and over again until destroyed. proteins are formed in a ribosome as amino acids...what is the best explanation, proper folding of a polypeptide is critical for a protein to function properly, which of the following pairs of base sequences could form a short stretch of DNA, Here is a sketch of two amino acids-the building blocks of...which atoms are removed, which model correctly depicts a neutral atom of hydrogen, one proton in middle, one electron in cloud, one drop each of water and ethyl alcohol... appearance of these two liquids, water molecules exhibit grater cohesion tension than do those of ethyl alcohol, in 1957, after rigorous testing, a pharmaceutical company in West germany introduced a new drug to the market, the drug contained molecules that were isomers and mirror images of each other. All of the following are true of enzymes except… The addition of an effector to an enzyme that acts as a K system of the MWC model causes the half-maximum velocity (K0.5) to ____ and Vmax to ____. The higher the Km is the higher the affinity of an enzyme is for the substrate. D, glucose-6-phosphate: negative heterotropic effector. O Elementary Steps In A Reaction Mechanism Are Always Unimolecular. Which of the following statement is/are correct about Enzyme: A. a) It is the major mechanism responsible for the gastric accommodation of a new meal. 22. C. They gave the national government control over domestic affairs of the states. Which of the following statements about the allosteric site is true? c. Enzymes cause reactions to occur. Question: All Of The Following Statements Are Correct EXCEPT O Enzymes Are Protein Molecules That Catalyze Reactions. B) one of its substrates is ribulose 1,5-bisphosphate C) it is found in the Calvin cycle. e. The activity of an enzyme is … All of the following statements are true for ‘Intestinal Motility’ except: A. B. c. They remain unchanged during a reaction d. They are often located within the plasma membrane of … GK Quiz on Enzymes will help you to understand the structure and function of enzymes, types of enzymes and their mechanism. H20 is a polar molecule because part of the molecule is positively charged while the remaining part is negatively charged. (D) Enzymes … c. Coenzyme and substrate availability can regulate enzyme reaction rate. (B) Most enzymes are highly specific with regard to the reactions they catalyze. d. a reaction mechanismdescribes the path of a reaction at the molecular level. what happens to the rest of the energy, you are performing enzyme-controlled reaction A+B+ enzyme... explanation for what substance X is, you perform an enzyme-controlled reaction, here is an equation for a simple enzyme-controlled experiment. e. All of the following statements about glycogen are true EXCEPT ... Branching enzyme breaks alpha-1,6-glucosidic bonds and forms alpha-1,4-glucosidic bonds ; Branching enzymes moves polymers containing 6 to 8 glucose units ; Answer. 2) All of the following statements concerning digestion are correct except A) The same enzymes are used in the digestion of carbohydrates, lipids, and proteins. Increased by Distension C. Increased by Acetylcholine D. Increased by cholecystokinin Correct answer : Does not depend on Gastric motility The stomach can influence intestinal motility by means of migratory motor complexes and gastroileal reflex. what would be the best way to increase the amount of AB produced, lower the activation energy of the reaction, read the following description of a branched reaction pathway, all of the following statements are correct about enzymes except, they raise the energy of activation of all reactions, you are carrying out an experiment with an enzyme from the human small intestine, which of the following can be used to determine the rate of an enzyme-catalyzed reaction, which of the following best describes the reaction shown below, which letter shows the energy of activation for the enzyme-catalyzed reaction, which letter shows the potential energy of the product, which level of protein structure is most directly related to specificity, Which of the following is correct about the role of oxygen during cell respiration, oxygen pulls electrons through the electron transport chain and ultimately bonds with them, the loss of hydrogen or electrons is known as, which of the following statements is correct about the reaction shown here, the reaction is an exergonic oxidation reaction, which of the following harvests the most energy during cell respiration, all of the following processes produce ATP except, after strenuous exercise a muscle cell would contain decreased amounts of ___________ and increased amounts of ______, which of the following is correct about the processes shown, process B produces ATP by substrate level phosphorylation, identify the site of the ATP synthase in the sketch of a mitochondrion shown below, each NADH molecule carrying hydrogen to the electron transport chain can produce a maximum of ____ molecules of ATP, which is true of aerobic respiration but not true of anaerobic respiration, which of the following is the most important thing that happens during aerobic respiration, in addition to ATP what is produced during glycolysis, which of the following probably evolved first, which is an example of a feedback mechanism, phosphofructokinase an allosteric enzyme in glycolysis is inhibited by ATP, during cell respiration most ATP is formed as a direct result of the net movement of. All of the following are correct statements about enzyme regulation … The T form (tense or taut form) of deoxyhemoglobin differs from oxyhemoglobin (the R form or relaxed form) by all EXCEPT: Which of the following is true regarding effectors of oxygen-hemoglobin binding? all of the following statements are correct about enzymes except. 2) All of the following statements about the Michaelis constant are correct EXCEPT a. Which statement about them is correct? b) Tetra hydrobiopterin. When binding one equivalent of S to an allosteric protein enhances the binding of additional equivalents of S to the same protein molecule, it is termed a(n): The presence of a negative allosteric effector on an allosteric protein would: D, raise the apparent value of the equilibrium constant, L. An enzyme that displays negative cooperativity has ____ activity when the substrate is present at concentrations ____ than the value of K0.5 when compared with enzymes that display no cooperativity. Even fleeting combinations of this type will reduce the efficiency of the enzyme. one end of a detergent molecule is nonpolar in order to dissolve oily stains, while the other end is polar to dissolve in the rinse water. At very high temperature, enzyme activity decreases because denaturation of proteins occurs and enzyme becomes inactive. They are equal to inorganic catalysts in efficiency. B) The major physical processes in digestion are mixing, softening, and grinding of food. answer choices . Which of the following statements regarding enzyme regulation is true? All of the following are correct about enzymes EXCEPT (A) the mechanism by which enzymes work is known as lock and key (B) they are proteins (C) they denature at high temperatures (D) they are assisted by vitamins and minerals (E) enzymes are not degraded during a reaction a. They increase the rate of a reaction. d. The Km is affected by competitive and uncompetitive inhibitors. All of the following statements about the pentose phosphate pathway are true EXCEPT ... Glucose-6-phosphate dehydrogenase is the control enzyme and it is regulated by the NADPH concentration of the cell ; If it is producing more than twice as much NADPH as ribose-5-P, it can produce glyceraldehyde-3-P and fructose-6-P ; It is found in the mitochondria of liver, muscle … The polypeptide of myoglobin serves all of the following functions EXCEPT: D, keeps the heme iron in the ferric form. b. Secretion of enzymes by acinar cells occurs in response to CCK. it is an on-off molecular switch that gets activated by the membrane-bound receptor. Which of the following statements about a particular molecule is correct and gives your reason for your answer? The major control enzyme is fructose-1,6-bisphosphatase that is inhibited by fructose-2,6-bisphosphate All of the following are general mechanisms of drug permeation Except (a) Aqueous diffusion (b) Aqueous hydrolysis (c) Lipid diffusion (d) Pinocytosis or endocytosis (e) Special carrier transport 2. 1. c)enzyme function is dependent on the pH and temperature ofthe reaction environment . c. Vagotomy augments secretion of enzymes after a … d. The reaction rate slows as equilibrium is approached. D. Enzymes function best at an optimum temperature 20-40°C . e. elementary steps ina reaction mechanism are always unimolecular. All of the following statements about the Articles of Confederation are true EXCEPT: A. 1) Enzymes are proteins whose three-dimensional form is key to their function , 2) Enzymes do not alter the overall change in free energy for a reaction , 3) All of the above , 4) Enzymes speed up reactions by lowering activation energy c. When the allosteric site of an enzyme is occupied, the reaction is irreversible and the enzyme cannot … The cause of cell sickling in sickle cell anemia is: B, precipitation of deoxy-Hb S into long, chain-like fibers. b. Enzymes Often Act As Channel Proteins In The Plasma Membrane. C) The major chemical reaction in digestion is enzyme-catalyzed hydrolysis of large molecules. a. Bicarbonate rich fluid is secreted by ductal epithelial cells in response to secretin. They raise the energy of activation of all reactions B. The reaction proceeds with a net release of free energy. They are highly specific. All of the following statements are correct about enzymes Except: a. a. Bicarbonate rich fluid is secreted by ductal epithelial cells in response to secretin . All of the following statements about aerobic glycolysis are true except The control enzyme is phosphofructokinase-1 which converts fructose-6-phosphate to fructose-1,6-bisphosphate ; The pathway is activated allosterically by fructose-2,6-bisphosphate and AMP ; The pathway is in the cytosol of every cell ; The pathway produces lactate and NAD + The pathway begins with … a)enzyme activity can be inhibited if their allosteric site isbound with a noncompetitive inhibitor. c. Vagotomy augments secretion of enzymes after a meal. Which of the following statements about enzymes is incorrect? 1. C) They generally solidify at room temperature. c) Renal failure. Usually the quickest method of influencing an enzymatic activity is by: Which of the following statements is correct regarding isozymes? add more substrate . The allosteric site is a second active site on a substrate in a metabolic pathway. All are true about isozymes of lactate dehydrogenase (LDH) that are present in a number of different tissues EXCEPT: B, the amount of subunit phosphorylation differs. c. A single enzyme typically reacts with many different substrates. Top. They accelerate a reaction. Enzymes Are Almost Always Proteins. Adenylyl cyclase catalyzes the synthesis of cAMP, and cAMP hydrolysis is catalyzed by a 5'-phosphodiesterase. c) It is part of the deglutition reflexes. C, addition of an allosteric activator to a K system changes the plot of V versus [S] from a sigmoidal curve to a more hyperbolic curve. B. b) Tyrosine. Q.33- The amino acid that undergoes oxidative deamination at the highest rate is-a) Glutamine. Which statement below about contrasting Hb and Mb is FALSE? (C) It produce a pancreatic Secretion rich in enzymes. Competitive inhibitors are often chemical analogs of the substrate. … They function optimally at a particular pH. They increase the delta G of a reaction. Of the following, which promotes the release of oxygen by hemoglobin. a. a heterogeneouscatalyst is in a different phase from the reaction mixture. B, the presence of CO2 enhances the release of oxygen from hemoglobin. 15. a) Pepsinogen is the chief enzyme which digests protein and requires removal of a peptide sequence from the active cleft before it can work b) Pancreatic á-amylase will … For a group-specific enzyme, one substrate would be a competitive inhibitor of reactions of the other possible substrate. The function of glycogen phosphorylase is: C, catalyze the phosphorolysis of glucose-1-phosphate from glycogen molecules. Which of the following is the correct structure of the detergent molecules and the correct reason for it? Q.16- All of the following amino acids are donors of one carbon compounds except-a) Histidine. The following statements about enzymes are true except (choose all that apply): They are consumed during the reaction. Regulation of metabolism by activation of the gene encoding a particular enzyme is called ____. B) They have multiple double bonds in the carbon chains of their fatty acids. c. Coenzyme and substrate availability can regulate enzyme reaction rate. Enzyme Glycerol kinase plays an important role C. Enzyme Glycerol 3 phosphate dehydrogenase plays an important role D. Phosphatidate is hydrolyzed Correct answer : B. All of the following are examples of a zymogen and its activating protease EXCEPT: A, proteolytic excision of a specific peptide. Enzymes Can Be Activated, Inactivated, Or Modulated. All of the following are true of enzymes EXCEPT. They gave each state one vote in Congress. Correct statements regarding Receptive Relaxation include all of the following EXCEPT one (choose the incorrect one). d. The reaction rate slows as equilibrium is approached. mcq on pharmacology 1. All of the following are correct statements about enzyme regulation EXCEPT: E, the activity of an enzyme is covalently affected by allosteric regulators. answer choices . (B)It causes contraction of the gall bladder wall being a natural cholagogue. one version worked as expected, while the other caused birth defects, isotopes are atoms of a given element that have the same number of protons but vary in the number of neutrons the element carbon has three isotopes, they are chemically identical because they have the same number of electrons, all of the following are characteristics of water except, water molecules have little attraction for each other, Which of the following is stored in the human liver for energy, which of the following is an example of a hydrogen bond, the attraction between the oxygen of one water molecule and the hydrogen of an adjacent molecule, which of the following is correct about G protein. All of the following are characteristics of hemoglobin's binding of oxygen EXCEPT: B, protons promote binding of oxygen by Hb. Correct Answer: Enzymes are mostly proteins but some are lipids also. View ch 15 biochem.docx from CHEM 473 at New Jersey Institute Of Technology. A enzyme called catalase is found in your liver which is used to clear out Hydro-peroxide (comes from alcohol). Hence statement D is correct. Which of the following statements about enzymes is wrong? b. Q.32- Hydroxylation of Phenyl Alanine to Tyrosine requires all except. All of the following pairs are correctly matched except: a) oxidation: reaction where electrons are gained b) metabolism: sum of all chemical reactions c) metabolic pathways: sequences of chemical reactions d) anabolism: building of complex molecules e) catabolism: breakdown of organic compounds. Does not depend on Gastric motility B. b)enzyme function is dependent on the three-dimensionalstructure or conformation of the enzyme. Regarding synthesis of triacyl glycerol in adipose tissue, all of the following are true except: A. Synthesis from Dihydroxyacetone phosphate B. All of the following statements about enzymes and enzyme catalyzed reactions are true EXCEPT a. Enzymes bind to substrates and products reversibly. They enable reactions to occur at a relatively low temperature C. They remain unchanged during a reaction D. They are often located within the plasma membrane of the cell Q.15-Blood urea decreases in all of the following conditions, except-a) Liver cirrhosis. About Cholecystokinin-pancreozymin(CCK), all the following are true except: (A)It is GIT hormone secreted by the duodenal mucosa in response to presence of fat or protein digestive products. Even fleeting combinations of this type will reduce the efficiency of the enzyme. c) Tryptophan. b. We are protected to some extent against low level CO poisoning because: C, His E7 blocks perpendicular binding of CO to heme iron allowing for better binding competition by O2. which of the following … All of the following statements concerning saturated fats are true except A) They are more common in animals than in plants. d) NADPH. All of the following are correct statements about enzyme regulation EXCEPT: a. Enzymes can be inhibited by the products they produce. By taking into account the … Which of the following is true for all exergonic reactions? Options (a) Enzymes require optimum pH and temperature for maximum activity (b) Enzymes are denatured at high temperatures (c) Enzymes are mostly proteins but some are lipids also (d) Enzymes are highly specific. Explanation: Almost all enzymes … All of the following statements about Rubisco are true except A) it is found in carboxysomes in many bacteria. Which of the following is a correct relation? The professor told me to ignore the gluconeogenesis in the kidney. c) Molecular oxygen. Which of the following will cause an increase in the activity of glycogen phosphorylase? The insulin, in … O A Reaction Mechanism Describes The Path Of A Reaction At The Molecular Level. the rate of substrate used up. b. enzymes are proteinmolecules that catalyze reactions. which of the following can be used to determine the rate of an enzyme-catalyzed reaction. They were the first written plan for the government of the United States. They are almost always proteins. All of the following statements about gluconeogenesis are correct EXCEPT Gluconeogenesis take place in the liver and kidney but the kidney uses all the glucose it produces. They are proteins that catalyze specific biologic reactions. A, right; deoxyHb; humans and other primates, Fetal hemoglobin (Hb F) has an intrinsically greater affinity for O2, A, Hb F has a diminished capacity to bind BPG compared to Hb A. A. Characteristics of glycogen phosphorylase include all EXCEPT: For muscle glycogen phosphorylase, Pi (inorganic phosphate) is a: The correct sequence for the hormone-activated enzymatic cascade that leads to activation of glycogen phosphorylase is: The G subunit of GTP-binding protein (G protein) has all of the following characteristics EXCEPT: All are true for cAMP-dependent protein kinase EXCEPT: Glycogen phosphorylase displays allosteric activation and inhibition by multiple modes. They decrease the activation energy of a reaction. b) Pregnancy. All are characteristic of allosteric enzymes EXCEPT: All are properties of regulatory enzymes EXCEPT: D, monomeric enzymes with a single regulated active site. oxidation: reaction where electrons are gained. Which statement about this process is correct? They function in an aqueous environment. signal transduction pathways are complex, involving many different molecules and many steps... signal transduction pathways offer more opportunity to amplify the signal, bisphenol A is a chemical agent found in many plastics, it mimics the hormone estrogen and causes problems in fetal development even when estrogen is not present in excess, which of the following is not correct about apoptosis, the signals that trigger the process always come from outside the cell that is to die, which of the following if true about water potential, the water potential inside a cell is positive, you tag amino acids with radioactive phosphorus because amino acids are incorporated, ER-Golgi apparatus-vesicles that fuse with plasma membrane, which of the following is not normally found in a plant cell, which of the following is present in a prokaryote cell, membranes are components of all of the following except a, which of the following is not related to cell-to-cell communication, what is the approximate size of a human red blood cell, smooth ER carries out all of the following activites except, which one of the following would not normally diffuse through the lipid bilayer, which of the following best characterizes the structure of the plasma membrane, the cytoplasmic channels between plant cells are called, identify the hydrophillic portion of a lipid molecule, identify the proteins involved in transport, identify the structure involved in cell-to-cell communication, which of the following is correct about protein kinase receptors, they belong to a class of plasma membrane receptors that exhibit enzyme activity, which of the following is correct about signal transduction pathways, in the signal transduction pathway a single molecule can stimulate the release of thousands of molecules of product within a cell, which of the following initiates a signal transduction pathway that leads to a response in a cell, a transmembrane receptor changes its conformation, which of the following is correct about chemical signals that bind to receptors located on the cell membrane rather than receptors in the cytoplasm, which of the following is correct about receptors that are located in the cytoplasm, they blind to a signal molecule in the cytoplasm which causes a response in the nucleus, which of the following most accurately describes the advantage of a signal transduction pathway, one binding molecule can trigger the release of thousands of molecules, which of the following correctly describes the role of cyclic AMP, it acts as a second messenger for signaling molecules that cannot pass through the cell membrane, which of the following choices best describes the reaction below, the potential energy of the reactants is greater than the potential energy of the products, when glucose is broken down in a cell only about 38% of the energy released is captured by the cell for later use. c) Aspartate. Enzyme Glycerol kinase plays an important role Glycerol kinase […] c. catalysts are notconsumed in reactions. When O2 binds to heme in hemoglobin, the ____ ion is drawn into the plane of the ____ causing a conformational change that is transmitted to adjacent subunits enhancing the ____ for additional O2 binding. Question: All Of The Following Statements Concerning Digestion Are Correct Except Answer The Same Enzymes Are Used In The Digestion Of Carbohydrates, Lipids, And Proteins. All of the following statements about enzymes are true EXCEPT (A) A single enzyme molecule can be used over and over again. All of the following statements regarding enzymes are true except: Enzymes are carbohydrates that function as agents that change the rate of reaction without being consumed in the reaction. d) Urea cycle disorders. If caffeine inhibits 5'-phosphodiesterases, drinking a caffeinated beverage would ____ cAMP levels and ____ glycogen phosphorylase activity. d. They lower the activation energy of a reaction. they raise the energy of activation of all reactions. d) Alanine. Question: Question 35 1 Pts All Of The Following Are True Statements About Enzymes EXCEPT: Enzymes Are Required For Metabolic Processes. All of the following statements about competitive inhibition are correct EXCEPT: A. All of the following statements are correct EXCEPT. All of the following statements about enzymes are true, EXCEPT. b) It is restricted to the proximal region of the stomach. All of the following are correct statements about enzyme regulation EXCEPT: a. Enzymes can be inhibited by the products they produce. A high carbohydrate of mixed meal will cause the release of insulin as one goes from the fasting to the fed state. All of the following statements about enzymes are true, except: a. Many competitive inhibitors are compounds that resemble the substrate and combine with the enzyme to form an enzyme inhibitor complex, but without leading to catalysis. By taking into account the molecular geometry of inhibitors that resemble the substrate, we can reach conclusions about which parts of the normal substrate bind to the enzyme. you are carrying out an experiment with an enzyme from the human small intestine. All of the following statements about acetyl CoA carboxylase are correct except from BIOCHEM 404 at Rutgers University Digestion Can Be Considered A Catabolic Process In Which Bulk Food Is Broken Down Into Individual Small Molecules. D) It catalyzes the addition of CO2 to glyceraldehyde 3-phosphate (G3P). d)enzymes are essentially protein in their … glycolysis is the first phase of aerobic cellular respiration it is a complex enzyme-controlled set of reactions in which glucose molecules are broken down... PFK inhibits the production of ATP when ATP levels are high, which of the following statements about cell respiration is NOT correct, which of the following is NOT correct about NADH and/or FADH2, FADH2 results in the production of more ATP than does NADH, Here is a reaction showing the combustion of methane. A, the conversion of trypsinogen to trypsin is an example of zymogen activation. All of the following are correct statements about pancreatic exocrine secretion EXCEPT.

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