Domanda del libro di testo
What is the oxidizing agent in the following reaction?
Pyruvate + NADH + H+ → Lactate + NAD+
a. Oxygen
b. NADH
c. Lactate
d. Pyruvate
5744
views
Ch. 9 - Cellular Respiration and Fermentation
Urry12th EditionCampbell BiologyISBN: 9785794169850
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch. 1 - Evolution, the Themes of Biology, and Scientific Inquiry8
- Ch. 2 - The Chemical Context of Life8
- Ch. 3 - Water and Life6
- Ch. 4 - Carbon and the Molecular Diversity of Life9
- Ch. 5 - The Structure and Function of Large Biological Molecules9
- Ch. 6 - A Tour of the Cell6
- Ch. 7 - Membrane Structure and Function6
- Ch. 8 - An Introduction to Metabolism6
- Ch. 9 - Cellular Respiration and Fermentation10
- Ch. 10 - Photosynthesis7
- Ch. 11 - Cell Communication7
- Ch. 12 - The Cell Cycle11
- Ch. 13 - Meiosis and Sexual Life Cycles10
- Ch. 14 - Mendel and the Gene Idea14
- Ch, 15 - The Chromosomal Basis of Inheritance6
- Ch. 16 - The Molecular Basis of Inheritance9
- Ch. 17 - Gene Expression: From Gene to Protein9
- Ch. 18 - Regulation of Gene Expression10
- Ch. 19 - Viruses6
- Ch. 20 - DNA Tools and Biotechnology7
- Ch. 21 - Genomes and Their Evolution8
- Ch. 22 - Descent with Modification: A Darwininan View of Life6
- Ch. 23 - The Evolution of Populations5
- Ch. 24 - The Origin of Species6
- Ch. 25 - The History of Life on Earth8
- Ch. 26 - Phylogeny and the Tree of Life8
- Ch. 27 - Bacteria and Archaea6
- Ch. 28 - Protists7
- Ch. 29 - Plant Diversity I: How Plants Colonized Land7
- Ch. 30 - Plant Diversity II: The Evolution of Seed Plants6
- Ch. 31 - Fungi5
- Ch. 32 - An Overview of Animal Diversity4
- Ch. 33 - An introduction to Invertebrates6
- Ch. 34 - The Origin and Evolution of Vertebrates7
- Ch. 35 - Vascular Plant Structure, Growth, and Development10
- Ch. 36 - Resource Acquisition and Transport in Vascular Plants8
- Ch. 37 - Soil and Plant Nutrition11
- Ch. 38 - Angiosperm Reproduction and Biotechnology8
- Ch. 39 - Plant Responses to Internal and External Signals8
- Ch. 40 - Basic Principles of Animal Form and Function8
- Ch. 41 - Animal Nutrition7
- Ch. 42 - Circulation and Gas Exchange7
- Ch. 43 - The Immune System5
- Ch. 44 - Osmoregulation and Excretion6
- Ch. 45 - Hormones and the Endocrine System8
- Ch. 46 - Animal Reproduction9
- Ch. 47 - Animal Development8
- Ch. 48 - Neurons, Synapses, and Signaling6
- Ch. 49 - Nervous Systems8
- Ch. 50 - Sensory and Motor Mechanisms5
- Ch. 51 Animal Behavior6
- Ch. 52 - An Introduction to Ecology and the Biosphere7
- Ch. 53 - Population Ecology9
- Ch. 54 - Community Ecology9
- Ch. 55 - Ecosystems and Restoration Ecology8
- Ch. 56 - Conservation Biology and Global Change6
Capitolo 9, Problema 8
Step 3 in Figure 9.8 is a major point of regulation of glycolysis. The enzyme phosphofructokinase is allosterically regulated by ATP and related molecules (see Concept 8.5). Considering the overall result of glycolysis, would you expect ATP to inhibit or stimulate activity of this enzyme? Explain.
(Hint: Make sure you consider the role of ATP as an allosteric regulator, not as a substrate of the enzyme.)
Guida verificata passo dopo passo1
Identify the role of phosphofructokinase in glycolysis: It catalyzes the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate, a key regulatory step in glycolysis.
Understand the concept of allosteric regulation: Allosteric regulators bind to an enzyme at a site other than the active site, causing a change in its activity.
Consider the role of ATP as an allosteric regulator: ATP can bind to phosphofructokinase and affect its activity, not just serve as a substrate.
Analyze the effect of ATP levels on glycolysis: High levels of ATP indicate that the cell has sufficient energy, which may lead to the inhibition of phosphofructokinase to slow down glycolysis.
Conclude the expected effect of ATP on phosphofructokinase: Given that ATP is an allosteric inhibitor, it is likely to inhibit the enzyme's activity, reducing the rate of glycolysis when energy is abundant.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
3mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Glycolysis
Glycolysis is a metabolic pathway that converts glucose into pyruvate, generating ATP and NADH in the process. It consists of ten enzymatic steps, with phosphofructokinase playing a crucial role in the third step. This pathway is essential for cellular respiration, providing energy and metabolic intermediates for cells.
Video consigliato:
05:04
Glycolysis
Phosphofructokinase Regulation
Phosphofructokinase (PFK) is a key regulatory enzyme in glycolysis, controlling the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate. It is allosterically regulated by ATP, which can inhibit its activity when ATP levels are high, thus slowing down glycolysis. This regulation ensures that energy production is balanced with the cell's energy needs.
Video consigliato:
03:31Cell Cycle Regulation
Allosteric Regulation
Allosteric regulation involves the binding of molecules at a site other than the enzyme's active site, causing a conformational change that affects enzyme activity. In the case of phosphofructokinase, ATP acts as an allosteric inhibitor, reducing the enzyme's activity when energy levels are sufficient, thereby preventing unnecessary ATP production.
Video consigliato:
03:31Cell Cycle Regulation
Pratica correlata
Domanda del libro di testo
Most CO2 from catabolism is released during
a. Glycolysis.
b. The citric acid cycle.
c. Lactate fermentation.
d. Electron transport.
5057
views
Domanda del libro di testo
This computer model shows the four parts of ATP synthase, each part consisting of a number of polypeptide subunits (the solid gray part is still an area of active research). Using Figure 9.13 as a guide, label the rotor, stator, internal rod, and catalytic knob of this molecular motor.
2386
views
Domanda del libro di testo
The proton pump shown in Figures 7.17 and 7.18 is a type of ATP synthase (see Figure 9.14). Compare the processes shown in the two figures, and say whether they are involved in active or passive transport (see Concepts 7.3 and 7.4).
1698
views
Domanda del libro di testo
When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?
a. The pH of the matrix increases.
b. ATP synthase pumps protons by active transport.
c. The electrons gain free energy.
d. NAD+ is oxidized.
3826
views