Microbiology: An Introduction (13th Edition)
13th Edition
ISBN: 9780134605180
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case, Derek Weber, Warner Bair
Publisher: PEARSON
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Question
Chapter 5, Problem 5MCQ
Summary Introduction
Introduction:
The Krebs cycle is also known as the citric acid cycle (TCA). It consists of multi-step chemical mechanisms used by all aerobic organisms for releasing stored energy by oxidization of the two pyruvates into high energy yielding molecules such as NADH, FADH2, and some ATP molecules.
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Which of the following statements does NOT explain the Krebs cycle?
a. It produces 6 carbon dioxide in the breakdown of a molecule of glucose.
b. t produces 6 NADH from the breakdown of a molecule of glucose.
c.It produces 2 ATP molecules in substrate level phosphorylation.
d.It produces 2 FADH2 in the breakdown of a molecule of glucose.
Which of the following statements is NOT true about Krebs Cycle?
a.
Krebs cycle is composed of 8-step enzymatic reactions.
b.
For every CO2 released in the cycle, NADH is produced.
c.
Succinyl-CoA allows the phosphorylation of GDP (Guanosine Diphosphate)
d.
The carbon atoms from the glucose that enters the cycle are released from the mitochondrion immediately.
Which of the following statements about
the TCA cycle is INCORRECT?
O a. The TCA cycle can recover much more energy
than homolactic fermentation.
b. All reactions of the TCA cycle take place in the
mitochondria.
C.
The energy released in the TCA cycle is mainly
stored in the reduced electron carriers NADH and
FADH₂.
O d. Under anaerobic conditions the TCA cycle is used
to oxidize pyruvate.
Oe. The TCA cycle is also called the citric acid cycle
after the product of the first reaction catalyzed by
pyruvate dehydrogenase.
Chapter 5 Solutions
Microbiology: An Introduction (13th Edition)
Ch. 5 - Prob. 1RCh. 5 - DRAW ITUsing the diagrams below, show each of the...Ch. 5 - DRAW IT An enzyme and substrate are combined. The...Ch. 5 - Define oxidation-reduction, and differentiate the...Ch. 5 - There are three mechanisms for the phosphorylation...Ch. 5 - All of the energy-producing biochemical reactions...Ch. 5 - Fill in the following table with the carbon source...Ch. 5 - Write your own definition of the chemiosmotic...Ch. 5 - Why must NADH be reoxidized? How does this happen...Ch. 5 - NAME IT What nutritional type is a colorless...
Ch. 5 - Which substance in the following reaction is being...Ch. 5 - Which of the following reactions produces the most...Ch. 5 - Prob. 3MCQCh. 5 - Which of the following compounds has the greatest...Ch. 5 - Prob. 5MCQCh. 5 - Prob. 6MCQCh. 5 - Which culture produces the most lactic acid? Use...Ch. 5 - Which culture produces the most ATP? Use the...Ch. 5 - Which culture uses NAD+? Use the following choices...Ch. 5 - Which culture uses the most glucose? Use the...Ch. 5 - Explain why, even under ideal conditions,...Ch. 5 - The following graph shows the normal rate of...Ch. 5 - Compare and contrast carbohydrate catabolism and...Ch. 5 - How much ATP could be obtained from the complete...Ch. 5 - The chemoautotroph Acidithiobacillus can obtain...Ch. 5 - Haemophilus influenzae requires hemin (X factor)...Ch. 5 - The drug Hivid, also called ddC, inhibits DNA...Ch. 5 - The bacterial enzyme streptokinase is used to...
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Similar questions
- Which of the following statements concerning the location of the metabolic pathways is correct? a. All reactions of the glycolysis take place in the mitochondria. b. All reactions of the TCA cycle take place in the mitochondria. c. Some reactions of the TCA cycle take place in the cytosol, and some in mitochondria. d. Some reactions of the glycolysis take place in the cytosol, and some in mitochondria.arrow_forwardIn which of the given steps of TCA cycle one C is lost from substrate in the form of CO2 as well as a molecule of NAD+ is reduced? a.Oxalosuccinic acid to a-ketoglutaric acid b.Isocitrate to oxalosuccinic acid c.Malic acid to oxaloacetic acid d.a-ketoglutaric acid to succinyl CoAarrow_forwardAll of the following are generated directly during the Krebs (TCA) cycle except? a. ATP b. GTP c. Oxaloacetate d. FADH2 e. NADHarrow_forward
- Which of the following number of products from the Krebs Cycle is a manifestation of 4 pyruvate molecules generated from glycolysis? A. 2 ATP, 6 NADH, 2 FADH₂ B. 3 ATP, 9 NADH, 3 FADH₂ C. 4 ATP, 4 NADH, 4 FADH₂ D. 4 ATP, 12 NADH, 4 FADH₂arrow_forward"which of the following can be used to replenish oxaloacetate in the krebs cycle"a. aspartic acid b.glutamine c.asparagine d. glutamic acidarrow_forwardBased on their roles in the metabolic process, classify the following substances as an oxidizing agent, reducing agent or neither. a. FADH2 b. ATP c. NAD+ d. NADH e. GTParrow_forward
- Which of the following statements is correct? a. Glycolysis and Krebs cycle produce ATP in substrate level phosphorylation b. Glycolysis and Krebs cycle produce ATP in oxidative level phosphorylation. c. Glycolysis and pyruvate oxidation produce ATP in substrate level phosphorylation. d. Glycolysis and pyruvate oxidation produce ATP in oxidative level phosphorylation.arrow_forwardIn the reaction catalyzed by malate dehydrogenase, which of the following molecules is classified as the reduced donor? a. Malate b. Oxaloacetate c. Fumerate d. FAD e. FADH2 f. NAD+ g. NADHarrow_forwardPhosphofructokinase is an important control enzyme in the regulation of cellular respiration. Which of the following statements correctly describes phosphofructokinase activity? a. It is inhibited by citrate, an intermediate of the citric acid cycle. b. It catalyzes a reaction which increases the rate of the overall pathway. c. It catalyzes an early step of glycolysis which has the lowest level of activation energy among the overall pathway. d. It is activated by ATP. e. It is inhibited by AMP.arrow_forward
- Explain why the hydrolysis of the following compounds releases energy. A. phosphoenol pyruvate B. 1,3-diphosphoglycerate C. succinyl CoAarrow_forwardWhich of the following statements about aerobic respiration is true? a. Oxygen is the final electron acceptor in the citric acid cycle. b. Coenzyme-A is a substrate in the reaction that generates a key reactant for the citric acid cycle. c. Redox reactions occur in the electron transport chain (ETC), but not during the citric acid cycle and not during glycolysis. d. The citric acid cycle is the main ATP producer in aerobic respiration.arrow_forwardAll are single-electron carriers EXCEPT: a. UQH2. b. Cyt bL. c. Cyt bH. d. Rieske protein Fe-S clusters. e. Cyt c1. 2.The energy input for the synthesis of glycogen occurs during which of the following enzyme catalysed steps? a. phosphoglucomutase b. UDP-glucose pyrophTosphorylase c. glycogen synthase d. amylo-(1,4®1,6)-transglycosylase e. none of the above require energy input ______________________________________________________________________________(arrow_forward
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