Question

3 — protein sources
learning objective: identify differences in high and low-quality protein sources
which of the following foods provides the highest quality protein rating?

a.) sweet potato
b.) milk
c.) beans
d.) rice

Explanation:

High - quality protein (complete protein) contains all essential amino acids in adequate amounts. Sweet potato (a) is a carbohydrate - rich food with little protein. Beans (c) are a plant - based protein source but are incomplete (lack some essential amino acids in sufficient amounts). Rice (d) is also a carbohydrate - rich food with limited protein. Milk (b) is an animal - based protein source and is a complete protein, providing all essential amino acids in appropriate ratios, so it has a higher quality protein rating.

Answer:

b.) Milk