When people hear the word "protein," the first food that often comes to mind is meat. Some people believe that they cannot obtain sufficient protein unless they eat meat. There are, however, many dietary sources of protein, both animal and plant. From the list below, choose all the correct statements about dietary sources of protein. Select all that apply. a. because it is so difficult to obtain enough protein from foods, most athletes need amino acids supplements to meet their increased protein requirements. b. although soybeans and foods made from soybeans (such as soy milk and tofu) are good sources of protein, the quality of soy protein is far inferior to that of meat. c. a serving size of peanut butter (2 tbsp) has about the same amount of protein as 1 oz of meat. d. skim milk and whole milk have a similar protein content. e. combining grains (such as rice or corn) with legumes (such as black beans or lentils) provides the body with a complete protein. f. all grains are sources of incomplete protein.

The correct sentences would be : A, B, C, D and E.

Explanation:

Option A is correct - Amino acids are basically the building blocks of protein. Athletes take amino acid supplements (in the form of as tablets, gels, or drink powders), after working out to spur muscle growth.

Option B is correct - Sources of animal protein, (that is meat, fish, poultry, eggs and dairy), are similar to the protein found in humans.

This is because they also contain essential amino acids like methionine, tryptophan, lycine and isoleucine.

On the other hand only two essential amino acids are found in soy. These essentials are also in small amounts, so soy (and its by products) isn't comparable to animal protein.

Option C is correct - 2 tablespoons (which is about 1 oz) of peanut butter contain about 9 grams of protein while 1 oz of meat contains about 7 grams of protein.

Option D is correct - Skim milk and whole milk have the same amount of proteins, carbohydrates, sugar and vitamin B 12. The difference between the two is skim milk has less calories and fat.

Option E is correct - Combining grains (such as rice or corn) with legumes (such as black beans or lentils) provides the body with a complete protein. This is because they compliment each other and one makes up for the protein the other lacks.

Option F is incorrect - Not all grains are sources of incomplete protein though most are. Some examples of grains that are sources of complete proteins are Quinoa.

Buckwheat, hemp, Chia seed, Spirulina, Tempeh, Amaranth. Most grains like rice, wheat, millet, corn..are èxamples of grains with in complete proteins.

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