Homework Answers
Question 4
Three enzymes are key enzymes involved in glycolysis. These three enzymes are hexokinase, phosphofructokinase, pyruvate kinase.
Glycolysis anaerobic metabolic pathway occurs in the cytoplasm of the cell. Glycolysis converts one glucose to 2 molecules of pyruvate. Note that actually in glycolysis 10 different enzymes and 10 biochemical reactions will occur. Out of 10, three are a regulatory step and three regulatory irreversible enzymes. These steps and enzymes are mentioned below.
Question 6
During step 3 of citric acid cycle, isocitrate is oxidized, and producing a five-carbon α-ketoglutarate, together with a molecule of CO2 and two electrons, which reduce NAD+ to NADH. This step is also regulated by negative feedback from ATP and NADH and by a positive effect of ADP. Steps three and four are both oxidation and decarboxylation steps, which release electrons that reduce NAD+ to NADH and release carboxyl groups that form CO2 molecules.
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Incorrect Question 4 0/1 pts How many enzymes are involved in the glycolytic pathway? 03 10...
Part B Use the structures given in the cycle shown before this part identify the enzymes involved in each step of the citric acid cycle by completing each sentence Match the words in the left column...
Part B Use the structures given in the cycle shown before this part identify the enzymes involved in each step of the citric acid cycle by completing each sentence Match the words in the left column to the appropriate blanks in the sentences on the right. View Available Hint(s) Reset Help isocitrate dehydrogenase aconitase citrate synthase fumarate hydratase succinate dehydrogenase succinyl-CoA synthetase a-ketoglutarate dehydrogenase malate dehydrogenase In step 1, oxaloacetate condenses with acetyl-CoA to form citrate, which is catalyzed by...
Question 24 (1 point) Which of the following enzymes does not catalyze a reaction in which...
Question 24 (1 point) Which of the following enzymes does not catalyze a reaction in which carbon dioxide (CO2) is released? O Alpha-ketoglutarate dehydrogenase Pyruvate dehydrogenase Malate dehydrogenase Isocitrate dehydrogenase Question 25 (1 point) The acute toxicity of cyanide to mammals is primarily caused by its ... O inhibition of cytochrome oxidase. O action as an uncoupler of oxidative phosphorylation. O inhibition of complex I of the electron transport chain. O inhibition of the citric acid cycle enzyme succinate dehydrogenase,
PLEASE ANSWER ALL PARTS. THANK YOU! 10. (12 pts) During cellular respiration the energy from oxidizing...
PLEASE ANSWER ALL PARTS. THANK YOU!
10. (12 pts) During cellular respiration the energy from oxidizing glucose to CO2 is used to synthesize ATP. NADH is an important intermediate that feeds electrons into the electron chain. A. (6 pts) Write down the net chemical equations (reactants products) that generate NADH in the citric acid cycle. Make sure to also name the enzymes that catalyze each individual reaction. B. (2 pts) All the dehydrogenases of glycolysis and the citric acid cycle...
1. (a) If the disaccharide lactose is hydrolyzed into monosaccharides, how will the products enter the...
1. (a) If the disaccharide lactose is hydrolyzed into monosaccharides, how will the products enter the glycolysis pathway? To show this, draw the full structure of lactose and show how it is hydrolyzed and the steps required for the products to be metabolized in the glycolysis pathway. For each synthetic step, write the name and draw the structure of reactant(s) and product(s), indicate any cofactors, and name the enzymes required. (Include final product for each (is, the glycolytic intermediate) and...
Incorrect Question 3 0/1 pts Which enzyme is the link between the citric acid cycle and...
Incorrect Question 3 0/1 pts Which enzyme is the link between the citric acid cycle and ATP formation? succinatethiokinase succinate dehydrogenase malate dehydrogenase citrate synthase isocitrate dehydrogenase
Question 4 0/1 pts To answer this question it may be useful to draw a diagram....
Question 4 0/1 pts To answer this question it may be useful to draw a diagram. If 89,446 molecules of NAD+ were reduced during all the reactions of cellular respiration, how many molecules of glucose would have been oxidized? Round your answer to the nearest integer. If one glucose oxidized results in 10 NAD being reduced to NADH, how many glucose are required to reduce 100 NAD? Question 5 0/1 pts To answer this question it may be useful to...
6. The cells of some organisms other than animals and yeast (such as bacteria) carry out...
6. The cells of some organisms other than animals and yeast (such as bacteria) carry out fermentation using molecules other than pyruvate, which are similarly reduced as pyruvate is. What is the goal of fermentation and why is the reduction of some molecule (whether it be pyruvate or some other molecule) important to achieve this goal? What would happen if the organism is unable to carry out this fermentation? 7. You want to study the enzymes that function in glycolysis,...
Hey! Could someone help me answers these 10 biology questions! 1. Respiration is comprised of a...
Hey! Could someone help me answers these 10 biology questions! 1. Respiration is comprised of a series of redox reactions. The chemical cofactor, NAD+, transitions through two different forms during this process. NAD+ is the _________ form and NADH is the ________ form. Select one: a. Reduced, reduced b. Reduced, oxidized c. Oxidized, oxidized d. Oxidized, reduced 2. Reduced molecules in the body that store energy include carbohydrates (sugars) and ________. Select one: a. Proteins b. Lipids c. None of...
Please choose the BEST ANSWER. No cell phones, web or cameras, please. 1. Each of the...
Please choose the BEST ANSWER. No cell phones, web or cameras, please. 1. Each of the following enzymes functions in both glycolysis and gluconeogenesis except: A) 3-phosphoglycerate kinase B) aldolase C) enolase D) phosphofructokinase-1 E) phosphohexose isomerase During strenuous exercise, the NADH formed in the glyceraldehyde 3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD if glycolysis is to continue. The most important reaction involved in this reoxidation of NADH is: 2. A) dihydroxyacetone phosphate> glycerol 3-phosphate B)...
Le past years Question 42 O pts Extra Credit. Which of the following explains why low-fat...
Le past years Question 42 O pts Extra Credit. Which of the following explains why low-fat diets are not necessarily the best for all humans? Individual humans have varying metabolisms and set points" When we eat less that - 20% of our calories from fat, we make fat from carbohydrates anyway We synthesize most of the cholesterol we use in our bodies regardless of diet Promoting low or no-fat diets in the past has caused many humans to over-consulte carbohydrates,...
Part B Use the structures given in the cycle shown before this part identify the enzymes involved in each step of the citric acid cycle by completing each sentence Match the words in the left column to the appropriate blanks in the sentences on the right. View Available Hint(s) Reset Help isocitrate dehydrogenase aconitase citrate synthase fumarate hydratase succinate dehydrogenase succinyl-CoA synthetase a-ketoglutarate dehydrogenase malate dehydrogenase In step 1, oxaloacetate condenses with acetyl-CoA to form citrate, which is catalyzed by...
Question 24 (1 point) Which of the following enzymes does not catalyze a reaction in which carbon dioxide (CO2) is released? O Alpha-ketoglutarate dehydrogenase Pyruvate dehydrogenase Malate dehydrogenase Isocitrate dehydrogenase Question 25 (1 point) The acute toxicity of cyanide to mammals is primarily caused by its ... O inhibition of cytochrome oxidase. O action as an uncoupler of oxidative phosphorylation. O inhibition of complex I of the electron transport chain. O inhibition of the citric acid cycle enzyme succinate dehydrogenase,
PLEASE ANSWER ALL PARTS. THANK YOU!
10. (12 pts) During cellular respiration the energy from oxidizing glucose to CO2 is used to synthesize ATP. NADH is an important intermediate that feeds electrons into the electron chain. A. (6 pts) Write down the net chemical equations (reactants products) that generate NADH in the citric acid cycle. Make sure to also name the enzymes that catalyze each individual reaction. B. (2 pts) All the dehydrogenases of glycolysis and the citric acid cycle...
1. (a) If the disaccharide lactose is hydrolyzed into monosaccharides, how will the products enter the glycolysis pathway? To show this, draw the full structure of lactose and show how it is hydrolyzed and the steps required for the products to be metabolized in the glycolysis pathway. For each synthetic step, write the name and draw the structure of reactant(s) and product(s), indicate any cofactors, and name the enzymes required. (Include final product for each (is, the glycolytic intermediate) and...
Incorrect Question 3 0/1 pts Which enzyme is the link between the citric acid cycle and ATP formation? succinatethiokinase succinate dehydrogenase malate dehydrogenase citrate synthase isocitrate dehydrogenase
Question 4 0/1 pts To answer this question it may be useful to draw a diagram. If 89,446 molecules of NAD+ were reduced during all the reactions of cellular respiration, how many molecules of glucose would have been oxidized? Round your answer to the nearest integer. If one glucose oxidized results in 10 NAD being reduced to NADH, how many glucose are required to reduce 100 NAD? Question 5 0/1 pts To answer this question it may be useful to...
Please choose the BEST ANSWER. No cell phones, web or cameras, please. 1. Each of the following enzymes functions in both glycolysis and gluconeogenesis except: A) 3-phosphoglycerate kinase B) aldolase C) enolase D) phosphofructokinase-1 E) phosphohexose isomerase During strenuous exercise, the NADH formed in the glyceraldehyde 3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD if glycolysis is to continue. The most important reaction involved in this reoxidation of NADH is: 2. A) dihydroxyacetone phosphate> glycerol 3-phosphate B)...
Le past years Question 42 O pts Extra Credit. Which of the following explains why low-fat diets are not necessarily the best for all humans? Individual humans have varying metabolisms and set points" When we eat less that - 20% of our calories from fat, we make fat from carbohydrates anyway We synthesize most of the cholesterol we use in our bodies regardless of diet Promoting low or no-fat diets in the past has caused many humans to over-consulte carbohydrates,...
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