Multiple Choice
In human physiology, which hormone is a major regulator of the overall rate of metabolism (basal metabolic rate)?
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Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism
Metabolic Regulation 1
Multiple Choice
Metabolic Regulation 1: Which of the following statements is NOT true about metabolism?
A
Metabolism is a static set of reactions that proceeds at a constant rate regardless of the cell’s environment or energy status.
B
Metabolic pathways are highly integrated and are regulated to meet the cell’s energy and biosynthetic needs.
C
Many metabolic pathways are regulated by allosteric enzymes and by covalent modification such as phosphorylation.
D
Metabolism includes both catabolic pathways that break down molecules and anabolic pathways that synthesize molecules.
Verified step by step guidance1
Understand the definition of metabolism: Metabolism encompasses all chemical reactions in a cell, including both catabolic (breaking down molecules to release energy) and anabolic (building molecules using energy) pathways.
Recognize that metabolism is dynamic: Metabolic pathways are not static; they adjust their rates based on the cell's environment, energy status, and needs to maintain homeostasis.
Identify regulatory mechanisms: Metabolic pathways are regulated through various means such as allosteric regulation (where enzymes change activity in response to binding of effectors) and covalent modifications like phosphorylation, which can activate or inhibit enzymes.
Evaluate each statement in the problem: Compare each statement against the core concepts of metabolism, focusing on whether metabolism is static or dynamic and how it is regulated.
Conclude which statement is NOT true: The statement claiming metabolism is a static set of reactions proceeding at a constant rate regardless of conditions contradicts the fundamental principle that metabolism is highly regulated and responsive to cellular needs.
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