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Which of the following best describes the field of biochemistry?
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1. Introduction to Biochemistry
What is Biochemistry?
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In biochemistry, the term metabolism refers to which of the following?
A
The passive diffusion of molecules across biological membranes without energy input
B
Only the synthesis of complex molecules from simpler precursors (anabolism)
C
Only the breakdown of complex molecules into simpler molecules to release energy (catabolism)
D
The sum of all chemical reactions in a cell or organism, including both catabolic and anabolic pathways
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Understand that metabolism encompasses all chemical reactions occurring within a cell or organism, not just a single type of reaction.
Recognize that metabolism includes two main categories: anabolism (the synthesis of complex molecules from simpler ones) and catabolism (the breakdown of complex molecules to release energy).
Note that passive diffusion is a physical process related to molecule movement across membranes and does not require energy or involve chemical reactions, so it is not part of metabolism.
Combine the concepts of anabolism and catabolism to define metabolism as the sum of all chemical reactions, both building up and breaking down molecules.
Conclude that metabolism refers to the entire network of chemical reactions in a cell or organism, integrating both energy-consuming and energy-releasing processes.
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