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Question 89 Gluconeogenesis is the A) Result of amylase activity B) Formation of glycogen C) Formation...
high and detecting one product at a time Question 77 The initial velocity of an enzyme...
high and detecting one product at a time Question 77 The initial velocity of an enzyme reaction (vo) describes A) The concentration of the enzyme at maximal velocity B) The concentration of substrate at maximal velocity C) The concentration of both at the start of the reaction D) The rate of the reaction when the substrate and enzyme are first med Question 78 What is the shape of a typical plot of initial rate vs substrate concentration tres kinetics? A)...
Enzyme 6. Where do substrates bind on an enzyme? A. allosteric site B. active site C....
Enzyme 6. Where do substrates bind on an enzyme? A. allosteric site B. active site C. receptor D. ion channel 7. Enzymes are capable of increasing the rate of a chemical reaction through which of the following means? A. changing AG from positive to negative B. reducing the activation energy C. changing the equilibrium point of the reaction D. increasing kinetic energy 8. When a molecule can occupy the same active site as the substrate, a situation called can result...
QUESTION 7 Consider the biochemical pathway A+E1 --> B+E2 --> C, where A, B, and Care...
QUESTION 7 Consider the biochemical pathway A+E1 --> B+E2 --> C, where A, B, and Care substrates and products and E1 and E2 are the enzymes that catalyze the reactions. Enzyme 1 (E1) can utilize only B as substrate. O only A as substrate. both A and B as substrates either A or B as substrate, but not both. neither A nor B as substrate.
Biochemistry The conversation of glucose 6-phosphate to glucose takes place in which organelle? a. cytoplasm b....
Biochemistry The conversation of glucose 6-phosphate to glucose takes place in which organelle? a. cytoplasm b. endoplasmic reticulum c. mitochondria d. all of the above e. none of the above Which of the following describes an enzyme that can catalyze an oxidation reaction a. dehydrogenase b. isomerase c. mutase d. all of the above e. none of the above Pyruvate is decarboxylated at the active site of which unit of the PDH complex a. E1 b. E2 c. E3 d....
6. In question 5, what is the most important reaction involved in formation of lactate? A)...
6. In question 5, what is the most important reaction involved in formation of lactate? A) dihydroxyacetone phosphate glycerol 3-phosphate D) pyruvate → lactate B) oxaloacetate → malate E) isocitrate → a-ketoglutarate C) glucose 6-phosphate → fructose 6-phosphate 7. During the process in question 5 (the rapid rise in lactate concentration), the NADH must be reoxidized to NAD+. Which of the following enzymes will be most affected if NADH is not reoxidized? A) Pyruvate kinase. C) Phosphofructokinase-1. E) aldolase. B)...
Which of the following is true about allosteric enyzmes? A) They typically catalyze the last reaction...
Which of the following is true about allosteric enyzmes? A) They typically catalyze the last reaction in a metabolic pathway since it is the critical step in the synthesis of the desired end product. B) They can have one subunit or several, depending on their catalytic needs. C) Their activity is often altered by a downstream product to form a feedback regulatory loop. D) They show a hyperbolic activity curve that increases with high levels of substrate. E) A and...
Km is: A. the concentration of an inhibitor needed to give 1/2 Vmax B. a measure...
Km is: A. the concentration of an inhibitor needed to give 1/2 Vmax B. a measure of the rate of product formation C. related to the affinity of the enzyme for its substrate D. a measure of the activation energy of the enzyme-catalyzed reaction E. the velocity equal to one-half of the maximum velocity
answer questions 15) An apoenzyme + cofactor(s) - a) Inhibitor b) active site c) substrate d)...
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15) An apoenzyme + cofactor(s) - a) Inhibitor b) active site c) substrate d) holoenzyme 16) Aspartate-transcarbamylase is an enveloved in a pathway that may produces molecule called Cytidine triphosphate. Cytidine triphosphate can bind to anot t o this enzyme, rendering the active site nonfunctional. This is an example of a) ATP hydrolysis b) competitive inhibition c) feedback inhibition d) allosteric activation 17) Which of the following is false regarding fermentation? a) fermentation occurs in the absence of...
Rodrigo is an enzyme engineer. He wants to know which of four peptide substrates is bound...
Rodrigo is an enzyme engineer. He wants to know which of four peptide substrates is bound most tightly by his engineered enzyme. Which value should he measure and pay attention to? Km KCAT Vo Both A and B kcat, [S], and [E]t Rodrigo's enzyme was assayed with three substrates (A, B, and C). The SAME enzyme concentration used was for each of the three reactions. The results of the three experiments are plotted as Lineweaver-Burke plots below. Considering what you...
Which of the following stages is essential for enzyme catalyzed reaction to occur? A. Enzyme-substrate binding stage B. Substrate transitional stage C. Enzyme-product releasing stage D. A and C E. A,B...
Which of the following stages is essential for enzyme catalyzed reaction to occur? A. Enzyme-substrate binding stage B. Substrate transitional stage C. Enzyme-product releasing stage D. A and C E. A,B and C In terms of source for activation energy, which of the followings is possible? A. releasing of solvent molecules or atoms from enzymes B. releasing of substrates or products from enzymes C. locally or globally reversible changes in enzyme structure D. All above E. None above
high and detecting one product at a time Question 77 The initial velocity of an enzyme reaction (vo) describes A) The concentration of the enzyme at maximal velocity B) The concentration of substrate at maximal velocity C) The concentration of both at the start of the reaction D) The rate of the reaction when the substrate and enzyme are first med Question 78 What is the shape of a typical plot of initial rate vs substrate concentration tres kinetics? A)...
Enzyme 6. Where do substrates bind on an enzyme? A. allosteric site B. active site C. receptor D. ion channel 7. Enzymes are capable of increasing the rate of a chemical reaction through which of the following means? A. changing AG from positive to negative B. reducing the activation energy C. changing the equilibrium point of the reaction D. increasing kinetic energy 8. When a molecule can occupy the same active site as the substrate, a situation called can result...
QUESTION 7 Consider the biochemical pathway A+E1 --> B+E2 --> C, where A, B, and Care substrates and products and E1 and E2 are the enzymes that catalyze the reactions. Enzyme 1 (E1) can utilize only B as substrate. O only A as substrate. both A and B as substrates either A or B as substrate, but not both. neither A nor B as substrate.
6. In question 5, what is the most important reaction involved in formation of lactate? A) dihydroxyacetone phosphate glycerol 3-phosphate D) pyruvate → lactate B) oxaloacetate → malate E) isocitrate → a-ketoglutarate C) glucose 6-phosphate → fructose 6-phosphate 7. During the process in question 5 (the rapid rise in lactate concentration), the NADH must be reoxidized to NAD+. Which of the following enzymes will be most affected if NADH is not reoxidized? A) Pyruvate kinase. C) Phosphofructokinase-1. E) aldolase. B)...
Which of the following is true about allosteric enyzmes? A) They typically catalyze the last reaction in a metabolic pathway since it is the critical step in the synthesis of the desired end product. B) They can have one subunit or several, depending on their catalytic needs. C) Their activity is often altered by a downstream product to form a feedback regulatory loop. D) They show a hyperbolic activity curve that increases with high levels of substrate. E) A and...
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15) An apoenzyme + cofactor(s) - a) Inhibitor b) active site c) substrate d) holoenzyme 16) Aspartate-transcarbamylase is an enveloved in a pathway that may produces molecule called Cytidine triphosphate. Cytidine triphosphate can bind to anot t o this enzyme, rendering the active site nonfunctional. This is an example of a) ATP hydrolysis b) competitive inhibition c) feedback inhibition d) allosteric activation 17) Which of the following is false regarding fermentation? a) fermentation occurs in the absence of...
Rodrigo is an enzyme engineer. He wants to know which of four peptide substrates is bound most tightly by his engineered enzyme. Which value should he measure and pay attention to? Km KCAT Vo Both A and B kcat, [S], and [E]t Rodrigo's enzyme was assayed with three substrates (A, B, and C). The SAME enzyme concentration used was for each of the three reactions. The results of the three experiments are plotted as Lineweaver-Burke plots below. Considering what you...
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