In the interdependent pathways in metabolism, _____ enzymes are predominant.

Question

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Question restatement: In the interdependent pathways in metabolism, _____ enzymes are predominant.

Option 1 - proteolytic: Proteolytic enzymes are enzymes that hydrolyze peptide bonds, typically involved in digestion or protein turnover. They are not characterized by being predominant in interdependent metabolic pathways; their primary role is catalysis of proteolysis, not regulation within metabolic flux networks. This makes this option unlikely as the best descriptor of predominance in metabolic pathway interdependence.

Option 2 - reversible: While many metabolic reactions are reversible, this descriptor refers to the directionality of the reaction under given conditions rather than the regulatory class of enzymes involved in interdependent pathways. Being reversible describes reaction kinetics more than the general regulator type, so it does not specifically identify the predominant enzyme class in interdependent metabolism.

Option 3 - trimeric: Trimeric describes quaternary structure (three subunits) of some enzymes. Although structural organization can influence enzyme properties, there is no universal claim that most enzymes in interdependent metabolic pathways are trimeric. This structural attribute is not a defining characteristic of predominance in interdependent metabolic regulation.

Option 4 - high Km: Km indicates substrate affinity; enzymes with high Km require higher substrate concentration for half-maximal activity. Again, this is a kinetic parameter for individual enzymes and not a general category that predominates across interdependent metabolic pathways. It does not capture a broad regulatory class.

Option 5 - allosteric: Allosteric enzymes are regulated by effectors (activators or inhibitors) at sites other than the active site, enabling fine-tuned control of metabolic flux across pathways. In many interdependent metabolic networks, key control points are governed by allosteric regulation, allowing coordinated responses to cellular states. This makes allosteric enzymes the most conceptually appropriate and widely recognized descriptor for predominance in interdependent metabolism.

Summary of reasoning for each option: The first four options describe proteolytic function, reaction reversibility, structural oligomerization, or kinetic affinity, none of which universally characterize the predominant enzymes guiding interdependent metabolic pathways. In contrast, allosteric regulation is a central mechanism enabling integration and coordination of flux across interconnected metabolic routes, aligning with the notion of predominance in such networks.

In the interdependent pathways in metabolism, _____ enzymes are predominant.单项选择题

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