Biochemistry: Concepts and Connections (2nd Edition)
2nd Edition
ISBN: 9780134641621
Author: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
Publisher: PEARSON
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Textbook Question
Chapter 12, Problem 18P
Avidin is a protein that binds extremely tightly to biotin, so avidin is a potent inhibitor of biotin-requiring enzyme reactions. Consider glucose biosynthesis from each of the following substrates and predict which of these pathways would be inhibited by avidin.
- Lactate
- Oxaloacetate
- Malate
- Fructose-6-phosphate
- Phosphoenolpyruvate
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Chapter 12 Solutions
Biochemistry: Concepts and Connections (2nd Edition)
Ch. 12 - Prob. 1PCh. 12 - Methanol is highly toxic, not because of its own...Ch. 12 - Prob. 3PCh. 12 - Prob. 4PCh. 12 - Prob. 5PCh. 12 - Write balanced chemical equations for each of the...Ch. 12 - Prob. 7PCh. 12 - Prob. 8PCh. 12 - Prob. 9PCh. 12 - Prob. 10P
Ch. 12 - Some anaerobic bacteria use alternative pathways...Ch. 12 - Write a pathway leading from glucose to lactose in...Ch. 12 - Prob. 13PCh. 12 - Prob. 14PCh. 12 - Prob. 15PCh. 12 - How many ATP equivalents are consumed in the...Ch. 12 - Prob. 17PCh. 12 - Avidin is a protein that binds extremely tightly...Ch. 12 - 14CO2 was bubbled through a suspension of liver...Ch. 12 - Prob. 20PCh. 12 - Prob. 21PCh. 12 - Prob. 22PCh. 12 - Prob. 23PCh. 12 - 24. Glycogen synthesis and breakdown are regulated...Ch. 12 - Prob. 25PCh. 12 - Prob. 26PCh. 12 - Prob. 27PCh. 12 - Prob. 28PCh. 12 - 29 [1-14C] Ribose-5-phosphate is incubated with a...Ch. 12 - Prob. 30PCh. 12 - Prob. 31PCh. 12 - Prob. 32PCh. 12 - Prob. 33P
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- How many ATP are produced from the complete degradation of 1,3-bisphosphoglycerate? the complete degradation of ONE glucose using the malate-aspartate shuttle as your guide.arrow_forwardA decrease in blood glucose levels will, in the liver, lead to the inhibition, either directly or indirectly, of which of the following enzymatic activities? Select one: a. Lactate dehydrogenase b. Phosphofructokinase c. Pyruvate kinase d. Enolasearrow_forwardHexokinase catalyzes the first step of glycolysis, in which glucose is phosphorylated to form glucose‑6‑phosphate. Give two reasons why a Mg2+ cation is required to facilitate this reaction.arrow_forward
- In the last step of glycolysis, phosphoenolpyruvate (PEP) is converted to pyruvate and during this reaction ATP is synthesized. Based on the fact that ATP is synthesized, which of the following enzymes would most likely catalyze this reaction? a. enolase b. pyruvate kinase c. aldolase d. pyruvate isomerase e. pyruvate dehydrogenasearrow_forwardWhat enzyme will be used if only the non-oxidative portion of the pentose phosphate pathway is operating to produce ribose 5-phosphate? a) 6-phosphogluconate dehydrogenase b) 6-phosphoglucono-lactonase c) glucose 6 phosphate dehydrogenase d) transketolasearrow_forwardWhich of the following glycolytic enzymes catalyzes the conversion of fructose-1,6-bisphosphate into the two product molecules dihydroxyacetone phosphate, and glyceraldehyde-3-phosphate? phosphoglycerate kinase pyruvate kinase malate dehydrogenase aldolase phosphofructokinasearrow_forward
- Which of the following products of the non-oxidative stage of PPP is an intermediate of the glycolysis pathway? Group of answer choices Xylulose-5-phosphate Fructose-6-phosphate Erythrose-4-phosphate Ribose-5-phosphatearrow_forwardiodoacetate is an irreversible inhibitor of glyceraldehyde-3-phosphate dehydrogenase. which of the following is the expected outcome of the exposure of a cell to iodoacetate - Cellular resiration will stop if the cell solely depends on glucose as fuel - The rate of cellular respiration will increase - The reoxidation of coenzymes will noy be affected , but the efficiency of oxidative phosphorylation will be diminished - There will be no effect on cellular respiration as long as the cell has a large glucose reserve -The cell sill not be able to reoxidize the reduced coenzymesarrow_forwardThe glycerol derived from lipolysis of triacylglycerols is converted into glyceraldehyde 3-phosphate, which then enters into step 6 of the glycolysis pathway. What further transformations are necessary to convert glyceraldehyde 3-phosphate into pyruvate?arrow_forward
- If glucokinase has a higher Km for glucose than does hexokinase, but can only bind to D-glucose, while hexokinase can bind to several hexose sugars (like D-glucose, D-mannose, and D-fructose), then: glucokinase has both a higher affinity and a higher specificity for D-glucose than does hexokinase glucokinase has both a lower affinity and a lower specificity for D-glucose than does hexokinase glucokinase has a higher affinity but a lower specificity for D-glucose than does hexokinase glucokinase has a lower affinity but a higher specificity for D-glucose than does hexokinase all of the abovearrow_forwardGlucose is converted to pyruvate in glycolysis, yielding a netsynthesis of 2 ATP. In certain cells pyruvate can be reconverted to glucose during gluconeogenesis. How many ATPsare required to convert pyruvate back to glucose?arrow_forwardIn the following diagram of glycolysis. Identify the steps that are amphibolic, taking place in both glycolysis and gluconeogenesis. Also, identify the regulated steps and what compounds act as regulators.arrow_forward
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