47.) Exactly of the enzymatic reactions in the citric acid cycle are classified as reactions. A) 2, lyase B) 4, oxidoreductase C) 1, hydrolase D)3, isomerase E) 4, transferase F) 2, ligase 48.) Which step of glycolysis involves a 4-carbon molecule resulting as a product? A) step 1 B) step 3 C) step 4 D) step 7 E) step 10 F) none of the steps

47.) Exactly of the enzymatic reactions in the citric acid cycle are classified as reactions. A) 2, lyase B) 4, oxidoreductase C) 1, hydrolase D)3, isomerase E) 4, transferase F) 2, ligase 48.) Which step of glycolysis involves a 4-carbon molecule resulting as a product? A) step 1 B) step 3 C) step 4 D) step 7 E) step 10 F) none of the steps

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Why is the citric acid cycle the central pathway in metabolism? (Select all that apply.) a) Citric acid is the most wide-spread organic compound. b) Products of other pathways are reagents for it. c) Reagents for other pathways are intermediates of citric acid cycle. d) All pathways contain citric acid.
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15.12) Determine whether each of the following metabolic processes occurs in the cytoplasm (outside of the mitochondria) or in the mitochondria. a) glycolysis cytoplasm b) citric acid cycle mitochondria c) beta oxidation mitochondria d) oxidative phosphorylation mitochondria EXPLANATION: The enzymes that catalyze the reactions of the citric acid cycle, beta-oxidation, and oxidative phosphorylation are all located in the mitochondria.
18) During glycolysis, the molecule shown at right is the substrate of a) aldolase b) triosephosphate isomerase c) glyceraldehyde 3-phosphate dehydrogenase d) phosphoglycerate mutase 0-P-O 19) fr the molecule at right (above) proceed to 2-phosphoglycerate, which of the following would be the position of the carbon marked with a star? b) c) d) H. -P=0 -0-P=0 ОН HO. HO. HO. When we break down fats (triacylglycerol), the glycerol can be converted to pyruvate (or lactate) by entering glycolysis as shown below. HO ATP ADP NAD NADH shycolysis но Om-o 20) If one molecule of glycerol is converted to one molecule of pyruvate, what is the net synthesis of ATP? a) +3 b) +2 c) +1 0 (P e) -1 f) -2 g) -3 21) If one molecule of glycerol is converted to one molecule of lactate, what is the net synthesis of NAD:H? a) +3 b) +2 c) +1 d) 0 e) -1 f) -2 g) -3 22) Consider the reaction catalyzed by phosphoglycerate mutase. Which of the following would force the reaction to go more so in the glycolysis…
two of the reduced electron carriers in the citric acid cycle come directly from a) isomerization of citrate b) lactic acid fermentation under anaerobic conditions c) condensation of acetate to form long-chain fatty acid d) oxidative decarboxylations e) succinate dehydrogenase reaction
|a) Explain why the citric acid cycle is considered to be the center of cellular metabolism. b) What are the substrates and products corresponding to one turn of the citric acid cycle? (no need for enzymes) c) Which steps of the citric acid cycle release CO2 as a product? Which steps produce NADH or FADH2? Which step produces GTP? d) How much ATP can be generated from glucose when the citric acid cycle is operating?
If a slight deficiency in the Vitamin B1 derivative Thiamine Pyrophosphate (TPP) leads to an accumulation of substrates for reactions utilizing this cofactor, A) what substrates would ‘accumulate’ in a human after eating a an enormous amount of sugar-laden Halloween candy, AND what would be the regulatory consequences on carbohydrate metabolism? B) what substrates would accumulate in yeast cells cultured under anaerobic (no oxygen) conditions AND what would be the regulatory consequences on carbohydrate metabolism? C) and lastly, what substrates would accumulate in plant cells incorporating carbon and generating energy solely using photosynthesis?
If a slight deficiency in the Vitamin B1 derivative Thiamine Pyrophosphate (TPP) leads to an accumulation of substrates for reactions utilizing this cofactor, A) what substrates would ‘accumulate’ in a human after eating a an enormous amount of sugar-laden Halloween candy, AND what would be the regulatory consequences on carbohydrate metabolism? B) What substrates would accumulate in yeast cells cultured under anaerobic (no oxygen) conditions AND what would be the regulatory consequences on carbohydrate metabolism? C) What substrates would accumulate in plant cells incorporating carbon and generating energy solely using photosynthesis?
for the coenzyme structures below label the following: a.) label the coenzymes b.) identify the reactive components of both coenzymes c.) identify the component that differs between NAD+ and NADP+ d.) how come these coenzymes are known as dinucleotides?
Which of these is associated with production of ATP during glycolysis? (Select all that apply) a) Conversion of 1,3-BPG to 3PG b) Conversion of 1,3-BPG to 2,3-BPG c) Conversion of PEP to pyruvate d) Conversion of 2,3-BPG to 2PG e) Phosphorylation of glucose
Which of the following citric acid cycle enzymes catalyzes substrate-level phosphorylation? A) isocitrate dehydrogenase B) α-ketoglutarate dehydrogenase C) succinyl CoA synthetase D) succinate dehydrogenase E) malate dehydrogenase
a) Write the general equation for cellular respiration. i) Based on the equation in 3a, what happen to the glucose and oxygen molecules during the redox reaction? Determine whether cellular respiration is an endergonic or exergonic process. Explain your answer. b) List the reactants and products for the process given i) Glycolysis. Reactants: Products (net): i) Citric acid cycle. Reactants: Products: c) How is ATP produced during Glycolysis and Citric acid cycle? d) Describe the process of ATP production by ATP synthase in oxidative phosphorylation.