Multiple Choice
Which of the following is a major source of energy for your body?
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7. Energy and Metabolism
Introduction to Metabolism
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A feature of catabolic reactions is that they:
A
break down complex molecules into simpler ones, releasing energy
B
always occur in the absence of enzymes
C
require energy input to build complex molecules from simpler ones
D
store energy in the form of ATP
Verified step by step guidance1
Step 1: Begin by understanding the term 'catabolic reactions.' Catabolic reactions are metabolic processes that break down complex molecules into simpler ones, often releasing energy in the process.
Step 2: Analyze the options provided in the problem. The first option states that catabolic reactions break down complex molecules into simpler ones, releasing energy. This aligns with the definition of catabolic reactions.
Step 3: Evaluate the second option, which claims that catabolic reactions always occur in the absence of enzymes. This is incorrect because enzymes are often required to catalyze and speed up catabolic reactions.
Step 4: Examine the third option, which suggests that catabolic reactions require energy input to build complex molecules from simpler ones. This describes anabolic reactions, not catabolic reactions.
Step 5: Consider the fourth option, which states that catabolic reactions store energy in the form of ATP. While catabolic reactions release energy, this energy is often used to synthesize ATP, but the primary feature is the breakdown of molecules and energy release.
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