Q: Which of the following equations correctly calculates the Recommended Dietary Allowance (RDA) for protein for a 70 kg adult?

$$0.8 \times 70 = 56$$ grams of protein per day

Question 1

Which of the following statements best explains why animal proteins are considered 'complete' proteins?

Accepted Answer

They contain all nine essential amino acids in sufficient quantities and proportions.

Question 2

A person with phenylketonuria (PKU) must avoid which artificial sweetener due to its phenylalanine content?

Accepted Answer

Aspartame

Question 3

Which of the following best describes the process of protein denaturation?

Accepted Answer

A change in the three-dimensional structure of a protein due to heat, pH, or mechanical forces.

Question 4

A vegan diet may be at risk for deficiency in which nutrient, and what is a reliable plant-based source?

Accepted Answer

Vitamin B12; fortified soy beverages

Question 5

Which of the following equations correctly calculates the Recommended Dietary Allowance (RDA) for protein for a 70 kg adult?

Accepted Answer

$$0.8 	imes 70 = 56$$ grams of protein per day

Question 6

Which of the following is a conditionally essential amino acid in individuals with phenylketonuria (PKU)?

Accepted Answer

Tyrosine

Question 7

A child presents with edema, a bloated belly, and changes in skin color but still has some fat stores. Which form of protein-energy malnutrition is most likely?

Accepted Answer

Kwashiorkor

Question 8

Which of the following best describes the role of proteins in fluid balance?

Accepted Answer

Proteins in the blood attract fluid back into capillaries, preventing edema.

Question 9

Which combination of plant foods provides all essential amino acids through protein complementation?

Accepted Answer

Rice and beans

Question 10

What is the primary reason why protein from animal sources is generally considered higher quality than protein from most plant sources?

Accepted Answer

Animal proteins contain all essential amino acids in the correct proportions and are more easily digested.

Question 11

Which of the following best describes a negative nitrogen balance?

Accepted Answer

Nitrogen intake is less than nitrogen output; protein breakdown exceeds synthesis.

Question 12

Which of the following is a function of hemoglobin, a protein found in red blood cells?

Accepted Answer

Transporting oxygen to cells and carrying carbon dioxide away

Question 13

Which process describes the removal of the amino group from an amino acid before it is used for energy production?

Accepted Answer

Deamination

Question 14

A patient with celiac disease must avoid which of the following proteins?

Accepted Answer

Gluten

Question 15

Which of the following best explains why combining legumes and grains in a meal is beneficial for vegetarians?

Accepted Answer

Each food provides the essential amino acids that the other lacks, resulting in a complete protein profile.

Question 16

Which of the following is a possible health risk associated with excessive protein intake?

Accepted Answer

Increased risk of kidney stones

Question 17

Which of the following best describes the structure of an amino acid?

Accepted Answer

A central carbon atom bonded to a hydrogen atom, an amino group ($$\mathrm{NH_2$}$$), an acid group ($$\mathrm{COOH}$$), and a unique side chain.

Question 18

Which of the following scenarios would most likely result in a positive nitrogen balance?

Accepted Answer

A pregnant woman

Question 19

Which of the following is a correct statement about food allergies?

Accepted Answer

They are adverse immune responses to specific food proteins.

Question 20

Which of the following best describes the process of transamination?

Accepted Answer

The transfer of an amino group from one amino acid to a keto acid to form a new amino acid.

Proteins and Amino Acids: Structure, Function, and Dietary Importance

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