Multiple Choice
Which of the following proteins primarily functions as a chemical messenger in the human body?
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1. Introduction to Biochemistry
Proteins
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Which of the following is true about proteins as an energy source in the human body?
A
Proteins cannot be converted into glucose through metabolic pathways.
B
Proteins are the body's preferred source of energy under normal conditions.
C
Proteins are primarily used for energy production when carbohydrates and fats are insufficient.
D
Proteins provide more energy per gram than fats.
Verified step by step guidance1
Understand the role of proteins in energy metabolism: Proteins are not the body's preferred energy source under normal conditions. Carbohydrates and fats are metabolized first because they are more efficient sources of energy.
Clarify the process of gluconeogenesis: Proteins can be converted into glucose through metabolic pathways, specifically gluconeogenesis. This occurs when amino acids are deaminated and their carbon skeletons are used to synthesize glucose.
Compare energy yield: Proteins provide less energy per gram compared to fats. Fats yield approximately 9 kcal/g, while proteins and carbohydrates yield about 4 kcal/g.
Identify the conditions for protein utilization: Proteins are primarily used for energy production when carbohydrates and fats are insufficient, such as during prolonged fasting or starvation.
Summarize the correct statement: Based on the above points, the correct answer is that proteins are primarily used for energy production when carbohydrates and fats are insufficient.
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