Multiple Choice
Which of the following processes occurs first during cellular respiration in eukaryotic cells?
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8. Respiration
Introduction to Cellular Respiration
Multiple Choice
Which source of energy is ideal for prolonged, low-intensity activity?
A
Glucose from glycogen
B
Creatine phosphate
C
Adenosine triphosphate (ATP) stored in muscles
D
Fatty acids
Verified step by step guidance1
Understand the context of the question: The problem is asking about the ideal energy source for prolonged, low-intensity activity. Different energy sources are utilized by the body depending on the intensity and duration of the activity.
Recall the role of fatty acids: Fatty acids are a primary energy source during prolonged, low-intensity activities because they are metabolized through aerobic respiration, which provides a steady supply of energy over time.
Compare energy sources: Glucose from glycogen is used during moderate to high-intensity activities, creatine phosphate is used for short bursts of high-intensity activity, and stored ATP is used for immediate energy needs but is quickly depleted. Fatty acids are ideal for sustained, low-intensity activity due to their efficiency in aerobic metabolism.
Understand the metabolic pathway: Fatty acids are broken down in the mitochondria through beta-oxidation, producing acetyl-CoA, which enters the citric acid cycle. This process generates ATP over a prolonged period, making fatty acids suitable for endurance activities.
Conclude why fatty acids are ideal: Fatty acids provide a long-lasting energy supply during low-intensity activities because they are abundant and metabolized efficiently in the presence of oxygen, unlike other energy sources that are better suited for short-term or high-intensity activities.
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