All of the following are TRUE about protein EXCEPT?

Question

BlackTom AI · Accepted Answer

Protein's principal biological roles are structural and functional: proteins build and repair tissues, act as enzymes and hormones, and support immune function. Energy provision (calories) is a secondary role used when carbohydrates and fats are insufficient.

1) Relevant knowledge points and concepts
- Proteins are macromolecules made of amino acids; their primary functions are growth, maintenance, enzyme activity, and transport.
- Protein provides 4 kcal per gram, so it can supply energy but is not the main physiological purpose.
- Recommended Dietary Allowance (RDA) for protein is 0.8 g per kg body weight per day for most adults.
- The food supply in the U.S. includes many high-protein options (meat, dairy, legumes, nuts, eggs, soy).

2) Complete reasoning process step by step
- Determine the RDA for a representative adult: for a 70-kg person, 0.8 g/kg × 70 kg = 56 g protein/day.
- Convert that to calories from protein: 56 g × 4 kcal/g = 224 kcal from protein if meeting the RDA exactly.
- Typical intakes in many populations exceed the RDA (for example, many adults consume 70–100+ g/day), so statements about Americans often consuming more than recommended are accurate.
- Because protein’s biochemical roles are building and repair, labeling its primary role as “to provide calories” misstates physiology.

3) Calculations (intermediate steps shown)
- RDA example: 0.8 g/kg × 70 kg = 56 g protein/day.
- Calories from that protein: 56 g × 4 kcal/g = 224 kcal.
- If someone consumes 90 g/day: 90 g × 4 kcal/g = 360 kcal from protein.

4) Why the correct answer is correct
- The statement “The primary role of protein is to provide calories.” is false because protein’s main functions are structural and functional (building tissues, enzymes, hormones). Energy is a secondary use.

5) Why other options are incorrect (i.e., why they are true)
- “Most Americans eat well above the recommended amount for protein each day”: true in many surveys—average intakes often exceed the RDA.
- “The primary role of protein is to provide the building material for body tissues.”: true; that is the main biological role.
- “There are many high protein foods available in the US”: true; a wide variety of animal and plant protein sources are readily available.

6) Conclusion
The incorrect (EXCEPT) statement is “The primary role of protein is to provide calories.” This matches the provided answer.

All of the following are TRUE about protein EXCEPT?单项选择题

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