Domanda del libro di testo
How do organisms control the rate of metabolic activities in their cells?
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Ch. 5 - Microbial Metabolism
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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TOC.tableOfContents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
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Capitolo 5, Problema 3
Examine the biosynthetic pathway for the production of the amino acids tryptophan, tyrosine, and phenylalanine in the figure. Where do the initial reactants (erythrose 4-phosphate and PEP) originate?
Guida verificata passo dopo passo1
Step 1: Identify the initial reactants in the biosynthetic pathway. According to the diagram, the pathway begins with erythrose 4-phosphate and phosphoenolpyruvic acid (PEP).
Step 2: Understand the metabolic origin of erythrose 4-phosphate. Erythrose 4-phosphate is an intermediate of the pentose phosphate pathway, which is a metabolic pathway parallel to glycolysis that generates NADPH and pentoses.
Step 3: Understand the metabolic origin of phosphoenolpyruvic acid (PEP). PEP is an intermediate in glycolysis, the central pathway for glucose catabolism, where it is formed from 2-phosphoglycerate and then converted to pyruvate.
Step 4: Recognize that these two molecules (erythrose 4-phosphate from the pentose phosphate pathway and PEP from glycolysis) combine to form 3-deoxy-D-arabino-heptulosonic acid 7-phosphate (DAHAP), the first committed step in the biosynthesis of aromatic amino acids.
Step 5: Conclude that the initial reactants originate from two distinct but interconnected metabolic pathways: erythrose 4-phosphate from the pentose phosphate pathway and PEP from glycolysis, linking central carbon metabolism to amino acid biosynthesis.
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Origin of Erythrose 4-Phosphate
Erythrose 4-phosphate is an intermediate of the pentose phosphate pathway, a metabolic route parallel to glycolysis. It is derived from the rearrangement of sugar phosphates and serves as a precursor for aromatic amino acid biosynthesis.
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04:44
Pentose-Phosphate Pathway
Origin of Phosphoenolpyruvic Acid (PEP)
Phosphoenolpyruvic acid (PEP) is a high-energy intermediate produced in the glycolytic pathway. It is formed from 2-phosphoglycerate and plays a key role in energy transfer and as a substrate for biosynthetic reactions, including aromatic amino acid synthesis.
Video consigliato:
03:44Acids
Biosynthesis of Aromatic Amino Acids and Feedback Inhibition
The biosynthesis of tryptophan, tyrosine, and phenylalanine begins with DAHAP, formed from erythrose 4-phosphate and PEP. Each amino acid regulates its own synthesis through feedback inhibition, where the end product inhibits the synthetase enzyme to maintain metabolic balance.
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04:37Amino Acids
Pratica correlata
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For the phrase given below, indicate the type of metabolism referred to, using the following choices:
a. Anabolism only
b. Both anabolism and catabolism (amphibolic)
c. Catabolism only
Is endergonic
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Domanda del libro di testo
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a. Anabolism only
b. Both anabolism and catabolism (amphibolic)
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The initial catabolism of glucose occurs by glycolysis and/or the ________ and ________pathways.
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How does a noncompetitive inhibitor at a single allosteric site affect a whole pathway of enzymatic reactions?
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