Q: A person consumes 2,000 calories per day. According to the recommended protein range (10-35% of daily calories), what is the minimum number of calories that should come from protein? Use the formula: $$\text{Minimum protein calories} = 2000 \times 0.10$$

$$2000 \times 0.10 = 200$$ calories

Question 1

Which of the following best describes a conditionally essential amino acid?

Accepted Answer

An amino acid that is nonessential under normal conditions but becomes essential when the body cannot make enough due to illness or stress.

Question 2

A patient recovering from surgery is found to have a positive nitrogen balance. What does this indicate about their protein metabolism?

Accepted Answer

They are retaining more protein than they are losing, which is necessary for tissue repair.

Question 3

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Storing genetic information

Question 4

During protein digestion, which enzyme is released by the pancreas to further break down polypeptides in the small intestine?

Accepted Answer

Chymotrypsin

Question 5

Which level of protein structure remains unchanged during denaturation?

Accepted Answer

Primary structure

Question 6

A vegetarian diet can reduce the risk of which of the following conditions?

Accepted Answer

Heart disease

Question 7

If a food contains all nine essential amino acids in sufficient amounts, it is classified as:

Accepted Answer

A complete protein

Question 8

Which of the following best describes a limiting amino acid?

Accepted Answer

An amino acid that is low or missing in a protein source, limiting protein synthesis

Question 9

Calculate the number of calories provided by 50 grams of protein. Use the formula: $$	ext{Calories} = 	ext{grams of protein} 	imes 4$$

Accepted Answer

$$50 	imes 4 = 200$$ calories

Question 10

Which of the following scenarios is most likely to result in a negative nitrogen balance?

Accepted Answer

An individual with severe protein-energy malnutrition

Question 11

Which process describes the unfolding of a protein’s shape due to heat, acids, or mechanical agitation?

Accepted Answer

Denaturation

Question 12

What is the primary site of amino acid absorption in the human body?

Accepted Answer

Small intestine

Question 13

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

Accepted Answer

Increased risk of kidney stones

Question 14

A person consumes 2,000 calories per day. According to the recommended protein range (10-35% of daily calories), what is the minimum number of calories that should come from protein? Use the formula: $$	ext{Minimum protein calories} = 2000 	imes 0.10$$

Accepted Answer

$$2000 	imes 0.10 = 200$$ calories

Question 15

Which of the following statements about peptide bonds is correct?

Accepted Answer

They link amino acids together to form proteins.

Question 16

Which enzyme is responsible for initiating protein digestion in the stomach?

Accepted Answer

Pepsin

Question 17

A person is following a diet that lacks one or more essential amino acids. Which type of protein are they most likely consuming?

Accepted Answer

Incomplete protein

Question 18

Which of the following is a potential consequence of not eating enough protein?

Accepted Answer

Protein-energy malnutrition

Question 19

Which of the following best explains why proteins can help maintain acid-base balance in the body?

Accepted Answer

Proteins act as buffers by accepting or donating hydrogen ions ($$\mathrm{H}^+) to $$resist changes in pH.

Question 20

Which of the following statements about protein-energy malnutrition is correct?

Accepted Answer

It can shut down essential processes in the body due to insufficient protein intake.

Comprehensive Study Notes on Proteins: Structure, Function, and Nutrition

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