Multiple Choice
For a typical healthy adult, what is the Recommended Dietary Allowance (RDA) for protein intake?
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1. Introduction to Biochemistry
Proteins
Multiple Choice
In human nutrition, how much metabolizable energy does 1 gram of protein provide (Atwater factor)?
A
7 kcal per gram
B
4 kcal per gram
C
9 kcal per gram
D
1 kcal per gram
Verified step by step guidance1
Understand that the Atwater factors are standard values used to estimate the metabolizable energy provided by macronutrients in human nutrition.
Recall that the Atwater factor for protein is a specific value representing the average energy yield from 1 gram of protein after digestion and metabolism.
Recognize that carbohydrates and proteins both provide approximately 4 kcal per gram, while fats provide about 9 kcal per gram, and alcohol provides about 7 kcal per gram.
Identify that the question asks specifically for the metabolizable energy from 1 gram of protein, which corresponds to the Atwater factor for protein.
Conclude that the Atwater factor for protein is 4 kcal per gram, meaning 1 gram of protein provides 4 kilocalories of metabolizable energy.
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