Homework Answers
(a) In the first step of the glycolytic pathway glucose is phosphorylated to glucose 6 phosphate at the expense on one ATP.
Glucose + ATP ----Glucose 6-phosphate +ADP + H±
(b)Reactions in the prepratory phase of glycolysis are as follows----
(1) Splitting Fructose 1,6-bisphosphate
Fructose 1,6-bisphosphate ---- Dihydroxyacetone phosphate + Glyceraldehyde 3-phosphate
(2)Triose Phosphate Isomerase.
Dihydroxyacetone phosphate (DHAP) <--- > Glyceraldehyde
3-phosphate
(3)Glyceraldehyde Phosphate Dehydrogenase. (Example of a
reaction coupled to
oxidation/reduction)
Glyceraldehyde 3-phosphate (GAP) + Pi + NAD+ <=>
1,3-Bisphosphoglycerate (BPG) + NADH
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8. In the preparatory phase, which steps of reactions need(s) ATP as a substrate? 9. Lists...
2a Which reactions require ATP? Which reactions produce ATP? What is the net yield of ATP...
2a Which reactions require ATP? Which reactions produce ATP? What is the net yield of ATP for every mole of glucose that enters the glycolysis pathway? 2b What are AG' and AG' for the glycolysis pathway? Is this pathway catabolic or anabolic? 2c Which step is an illustration of a reverse aldol condensation? 2d. Define substrate level phosphorylation. Which of these compounds in the glycolysis pathway have a large phosphate group transfer potential? 2e. Which steps are examples of redox...
no explaination is needed 28) Which of the following is true for all exergonic reactions? A)...
no explaination is needed
28) Which of the following is true for all exergonic reactions? A) The reaction proceeds with a net release of free energy B) The products have more total energy than the reactants. C) A net input of energy from the surroundings is required for the reactions to proceed. D) The reactions are nonspontaneous 29) When ATP releases some energy, it also releases Inorganic phosphate. What purpose does this serve (if any) in the cell? A) It...
4. Which of the following enzymes catalyzed reactions in glycolysis require(s) ATP as a substrate? A)...
4. Which of the following enzymes catalyzed reactions in glycolysis require(s) ATP as a substrate? A) Phosphoglycerate mutase E) Pyruvate kinase B) Aldolase F) Phosphofructokinase-1 C) Phosphoglycerate kinase G) Hexokinase D) Glyceraldehyde-3-phosphate dehydrogenase 5. Blood Lactate Levels during Vigorous Exercise The following graph shows the concentrations of lactate in blood plasma before, during, and after a 400 m sprint. Use your knowledge from chapter 14 to explain the causes of the rapid rise in lactate concentration? --Before-- - After Blood...
1.) Which of the following is the substrate or product of the reactions that comprise the...
1.) Which of the following is the substrate or product of the reactions that comprise the oxidative phase of the pentose phosphate pathway? A) glyceraldehyde-3-phosphate B) Ribulose-5-phosphate C) Seduheptulose - 7 - phosphate D) Ribose-5-phosphate 2) The regulated reactions of gluconeogenesis have/are A) Activated by molecules indicating a low energy charge in the cell B) reversible reactions C) those thare counter to regulated reactions in glycolysis D)Large positive change in G values 3) The biosynthesis of triacylglycerols in animals uses...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form complexes with their substrates b. Enzymes lower the activation energy for chemical reactions c. Enzymes change the Key for chemical reactions d. Many enzymes change shapes slightly when substrate binds 10. To overcome an energy barrier between reactants and products, energy must be provided to get the reaction started. This energy, which is recovered as the reaction proceeds, is called: a. Activation energy b....
QUESTION 25 Which of the following are true about kinases? The products of the reactions they...
QUESTION 25 Which of the following are true about kinases? The products of the reactions they catalyze have less free energy than the substrates, even when ATP is produced O kinases are enzymes that catalyze ATP hydrolysis in order to move vesicles along the microtubules The acivity of kinases cannot be regulated, which is why reactions catalyzed by kinases tend to be irriversible.
Need the correct answers and explain why they are now correct The first phase of gycolysis...
Need the correct answers and explain why they are now
correct
The first phase of gycolysis is called investment phase because a. Glucose accumulates to high levels in cell before glycolysis starts b. NADH is produced as an investment to be used later in the generation of ATP. c. It generates ATP d. NAD+ is regenerated for later use e. Energy is used in two steps to phosphorylate glucose and fructose-6-P Which statement about this reaction is TRUE? a. Pyruvate...
BACKGROUND The first part of this assignment focuses on the thermodynamics of enzyme-catalysed reactions. To answer the questions posed you will need apply the following two equations. Note that you...
BACKGROUND The first part of this assignment focuses on the thermodynamics of enzyme-catalysed reactions. To answer the questions posed you will need apply the following two equations. Note that you may need to re- arrange these equations to determine the value you need. You also need to take care with the units of the values you use and determine. The first equation defines the relationship between the change in free energy (AG ") and the equilibrium between the products and...
2. How is ATP used in most cell processes? a. It binds to a substrate and...
2. How is ATP used in most cell processes? a. It binds to a substrate and provides energy when the phosphate group is released. b. indirectly, by providing electrons to an acceptor c. Hydrolysis of ATP is coupled to an endergonic reaction. d. It increases the efficiency of some key enzymes. e. none of the above 2. How is ATP used in most cell processes? a. It binds to a substrate and provides energy when the phosphate group is released....
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...
2a Which reactions require ATP? Which reactions produce ATP? What is the net yield of ATP for every mole of glucose that enters the glycolysis pathway? 2b What are AG' and AG' for the glycolysis pathway? Is this pathway catabolic or anabolic? 2c Which step is an illustration of a reverse aldol condensation? 2d. Define substrate level phosphorylation. Which of these compounds in the glycolysis pathway have a large phosphate group transfer potential? 2e. Which steps are examples of redox...
no explaination is needed
28) Which of the following is true for all exergonic reactions? A) The reaction proceeds with a net release of free energy B) The products have more total energy than the reactants. C) A net input of energy from the surroundings is required for the reactions to proceed. D) The reactions are nonspontaneous 29) When ATP releases some energy, it also releases Inorganic phosphate. What purpose does this serve (if any) in the cell? A) It...
4. Which of the following enzymes catalyzed reactions in glycolysis require(s) ATP as a substrate? A) Phosphoglycerate mutase E) Pyruvate kinase B) Aldolase F) Phosphofructokinase-1 C) Phosphoglycerate kinase G) Hexokinase D) Glyceraldehyde-3-phosphate dehydrogenase 5. Blood Lactate Levels during Vigorous Exercise The following graph shows the concentrations of lactate in blood plasma before, during, and after a 400 m sprint. Use your knowledge from chapter 14 to explain the causes of the rapid rise in lactate concentration? --Before-- - After Blood...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form complexes with their substrates b. Enzymes lower the activation energy for chemical reactions c. Enzymes change the Key for chemical reactions d. Many enzymes change shapes slightly when substrate binds 10. To overcome an energy barrier between reactants and products, energy must be provided to get the reaction started. This energy, which is recovered as the reaction proceeds, is called: a. Activation energy b....
QUESTION 25 Which of the following are true about kinases? The products of the reactions they catalyze have less free energy than the substrates, even when ATP is produced O kinases are enzymes that catalyze ATP hydrolysis in order to move vesicles along the microtubules The acivity of kinases cannot be regulated, which is why reactions catalyzed by kinases tend to be irriversible.
Need the correct answers and explain why they are now
correct
The first phase of gycolysis is called investment phase because a. Glucose accumulates to high levels in cell before glycolysis starts b. NADH is produced as an investment to be used later in the generation of ATP. c. It generates ATP d. NAD+ is regenerated for later use e. Energy is used in two steps to phosphorylate glucose and fructose-6-P Which statement about this reaction is TRUE? a. Pyruvate...
BACKGROUND The first part of this assignment focuses on the thermodynamics of enzyme-catalysed reactions. To answer the questions posed you will need apply the following two equations. Note that you may need to re- arrange these equations to determine the value you need. You also need to take care with the units of the values you use and determine. The first equation defines the relationship between the change in free energy (AG ") and the equilibrium between the products and...
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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